research overview
- The Shaheen Group aims to find insightful solutions to compelling scientific questions and to engineer better materials, devices, and systems for future technologies that can benefit humankind.
- Contact Info
Shaheen, Sean Eric Associate Professor
Positions
- Associate Professor, Electrical, Computer and Energy Engineering (ECEE)
- Associate Professor, Physics
Research Areas
Research
keywords
- perovskite photovoltaic devices, organic electronics, neuromorphic computing, organic superconductors, complex systems
Publications
selected publications
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chapter
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conference proceeding
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Investigating The Effect of Lamination on FAMACs: Toward a New Phase Space of Perovskite Solar Cell Fabrication.
Proceedings of SPIE.
2019
- One-Step High-Throughput Blade Coating of Perovskite Solar Cells. 2799-2802. 2018
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Singlet-based photon upconversion in multichromophore organic thin films.
Proceedings of SPIE.
2015
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A better understanding of organic electrochemical transistors for biosensing applications.
Proceedings of SPIE.
2015
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Holographic spectral beamsplitting for increased organic photovoltaic conversion efficiency.
Proceedings of SPIE.
2014
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Optical method for making spatially and temporally resolved measurements of the hole concentration in organic electrochemical transistors.
Proceedings of SPIE.
2014
- High Open Circuit Voltage Organic Photovoltaics: Minimizing Energetic Loss with a High Band Gap Donor Polymer and a Small-Molecule Acceptor 2014
- Thermal annealing affects vertical morphology, doping and defect density in BHJ OPV devices. 2575-2580. 2014
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Conjugated polymer/nanostructured oxide semiconductor composite photovoltaic devices.
Conference Record IEEE Photovoltaic Specialists Conference.
71-73.
2005
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Investigating The Effect of Lamination on FAMACs: Toward a New Phase Space of Perovskite Solar Cell Fabrication.
Proceedings of SPIE.
2019
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journal article
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Neuromorphic-based Boolean and reversible logic circuits from organic electrochemical transistors.
Materials Research Society (MRS) Bulletin.
649-654.
2020
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Organic neuromorphic devices: Past, present, and future challenges.
Materials Research Society (MRS) Bulletin.
619-630.
2020
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Heterogeneous Cation-Lattice Interaction and Dynamics in Triple-Cation Perovskites Revealed by Infrared Vibrational Nanoscopy.
ACS Energy Letters.
1636-1643.
2020
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SOLAR CELLS Carrier lifetimes of > 1 mu s in Sn-Pb perovskites enable efficient all-perovskite tandem solar cells.
Science.
475-+.
2019
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Roll-to-Roll Printing of Perovskite Solar Cells.
ACS Energy Letters.
2558-2565.
2018
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Curtailing Perovskite Processing Limitations via Lamination at the Perovskite/Perovskite Interface.
ACS Energy Letters.
1192-1197.
2018
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Introducing correlations into carrier transport simulations of disordered materials through seeded nucleation: impact on density of states, carrier mobility, and carrier statistics.
Journal of Physics: Condensed Matter.
2018
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Degradation of Highly Alloyed Metal Halide Perovskite Precursor Inks: Mechanism and Storage Solutions.
ACS Energy Letters.
979-985.
2018
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Molecular weight dependence of carrier mobility and recombination rate in neat P3HT films.
Journal of Polymer Science Part B: Polymer Physics.
31-35.
2018
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High-Performance Flexible Perovskite Solar Cells on Ultrathin Glass: Implications of the TCO.
Journal of Physical Chemistry Letters.
4960-4966.
2017
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High-Performance Flexible Perovskite Solar Cells on Ultrathin Glass: Implications of the TCO..
Journal of Physical Chemistry Letters.
4960-4966.
2017
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Influence of disorder on transfer characteristics of organic electrochemical transistors.
Applied Physics Letters.
2017
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Role of Crystallization in the Morphology of Polymer:Non-fullerene Acceptor Bulk Heterojunctions.
ACS Applied Materials and Interfaces.
19021-19029.
2017
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Experimental demonstration of photon upconversion via cooperative energy pooling.
Nature Communications.
2017
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Thermal engineering of FAPbI(3) perovskite material via radiative thermal annealing and in situ XRD.
Nature Communications.
2017
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Microsecond Response in Organic Electrochemical Transistors: Exceeding the Ionic Speed Limit.
Advanced Materials.
8398-8404.
2016
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A Mini Review of Neuromorphic Architectures and Implementations.
IEEE Transactions on Electron Devices.
3819-3829.
2016
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Switchable diffractive optics using patterned PEDOT: PSS based electrochromic thin-films.
Organic Electronics.
271-279.
2016
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Removal of Residual Diiodooctane Improves Photostability of High-Performance Organic Solar Cell Polymers.
Chemistry of Materials.
876-884.
2016
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Optical Measurements Revealing Nonuniform Hole Mobility in Organic Electrochemical Transistors.
Advanced Electronic Materials.
2015
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Energy Pooling Upconversion in Organic Molecular Systems.
The Journal of Physical Chemistry A: Isolated Molecules, Clusters, Radicals, and Ions; Environmental Chemistry, Geochemistry, and Astrochemistry; Theory.
4009-4016.
2015
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Effect of fractal silver electrodes on charge collection and light distribution in semiconducting organic polymer films.
Journal of Materials Chemistry A.
16608-16616.
2014
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Neurons in Polymer: Hardware Neural Units Based on Polymer Memristive Devices and Polymer Transistors.
IEEE Transactions on Electron Devices.
3513-3519.
2014
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An inverted, organic WORM device based on PEDOT:PSS with very low turn-on voltage.
Organic Electronics.
1791-1798.
2014
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Direct synthesis of thermochromic VO2 through hydrothermal reaction.
Journal of Solid State Chemistry.
237-241.
2014
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Inherent properties of adenylosuccinate lyase could explain S-Ado/SAICAr ratio due to homozygous R426H and R303C mutations..
Biochimica et Biophysica Acta: international journal of biochemistry and biophysics.
1545-1553.
2013
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Highly efficient charge transfer in nanocrystalline Si:H solar cells.
Applied Physics Letters.
133101-133101.
2013
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Pathways to a New Efficiency Regime for Organic Solar Cells.
Advanced Energy Materials.
1246-1253.
2012
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Radio-frequency superimposed direct current magnetron sputtered Ga:ZnO transparent conducting thin films.
Journal of Applied Physics.
093718-093718.
2012
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Monitoring performance degradation of cerebellar functions using computational neuroscience methods: implications on neurological diseases..
PLoS One.
e45581.
2012
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Dark Carriers, Trapping, and Activation Control of Carrier Recombination in Neat P3HT and P3HT:PCBM Blends.
The Journal of Physical Chemistry C: Energy Conversion and Storage, Optical and Electronic Devices, Interfaces, Nanomaterials, and Hard Matter.
23134-23148.
2011
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Simultaneous measurement of carrier density and mobility of organic semiconductors using capacitance techniques.
Organic Electronics.
1879-1885.
2011
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Time-of-Flight Studies of Electron-Collection Kinetics in Polymer:Fullerene Bulk-Heterojunction Solar Cells.
Advanced Functional Materials.
2580-2586.
2011
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Photovoltaic manufacturing: Present status, future prospects, and research needs.
Journal of Vacuum Science and Technology Part A: International Journal Devoted to Vacuum, Surfaces, and Films.
030801-030801.
2011
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Air-processed organic photovoltaic devices fabricated with hot press lamination.
Organic Electronics.
108-112.
2011
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Conjugated Thiophene Dendrimer with an Electron-Withdrawing Core and Electron-Rich Dendrons: How the Molecular Structure Affects the Morphology and Performance of Dendrimer:Fullerene Photovoltaic Devices.
The Journal of Physical Chemistry C: Energy Conversion and Storage, Optical and Electronic Devices, Interfaces, Nanomaterials, and Hard Matter.
22269-22276.
2010
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Photoinduced Degradation of Polymer and Polymer-Fullerene Active Layers: Experiment and Theory.
Advanced Functional Materials.
3476-3483.
2010
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A simple miniature controlled-atmosphere chamber for optoelectronic characterizations.
Solar Energy Materials and Solar Cells.
1254-1258.
2010
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Exciton Migration in Conjugated Dendrimers: A Joint Experimental and Theoretical Study.
ChemPhysChem: a European journal of chemical physics and physical chemistry.
3285-3294.
2009
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A round robin study of flexible large-area roll-to-roll processed polymer solar cell modules.
Solar Energy Materials and Solar Cells.
1968-1977.
2009
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Detection of protein secondary structures via the discrete wavelet transform..
Physical Review E: Statistical, Nonlinear, and Soft Matter Physics.
051909.
2009
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The Effect of Ionization Potential and Film Morphology on Exciplex Formation and Charge Generation in Blends of Polyfluorene Polymers and Silole Derivatives.
The Journal of Physical Chemistry C: Energy Conversion and Storage, Optical and Electronic Devices, Interfaces, Nanomaterials, and Hard Matter.
14533-14539.
2009
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Structure-Dependent Photophysics of First-Generation Phenyl-Cored Thiophene Dendrimers.
Chemistry of Materials.
287-297.
2009
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Low-bandgap thiophene dendrimers for improved light harvesting.
Journal of Materials Chemistry.
5311-5324.
2009
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Quenching of excitons by holes in poly(3-hexylthiophene) films.
The Journal of Physical Chemistry C: Energy Conversion and Storage, Optical and Electronic Devices, Interfaces, Nanomaterials, and Hard Matter.
9865-9871.
2008
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Effect of ZnO Processing on the Photovoltage of ZnO/Poly(3-hexylthiophene) Solar Cells.
The Journal of Physical Chemistry C: Energy Conversion and Storage, Optical and Electronic Devices, Interfaces, Nanomaterials, and Hard Matter.
9544-9547.
2008
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Pathways for the degradation of organic photovoltaic P3HT : PCBM based devices.
Solar Energy Materials and Solar Cells.
746-752.
2008
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Bipolar Charge Transport in PCPDTBT-PCBM Bulk-Heterojunctions for Photovoltaic Applications.
Advanced Functional Materials.
1757-1766.
2008
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Optimal negative electrodes for poly(3-hexylthiophene): [6,6]-phenyl C61-butyric acid methyl ester bulk heterojunction photovoltaic devices.
Applied Physics Letters.
2008
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Performance of bulk heterojunction photovoltaic devices prepared by airbrush spray deposition.
Applied Physics Letters.
2008
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Hydrostatic pressure effects on poly(3-hexylthiophene) thin film transistors.
Applied Physics Letters.
013305-013305.
2008
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The locus of free charge-carrier generation in solution-cast Zn1-xMgxO/Poly(3-hexylthiophene) Bilayers for photovoltaic applications.
Advanced Functional Materials.
3849-3857.
2007
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Theoretical studies on conjugated phenyl-cored thiophene dendrimers for photovoltaic applications.
Journal of the American Chemical Society.
14257-14270.
2007
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Effect of Polymer Processing on the Performance of Poly(3-hexylthiophene)/ZnO Nanorod Photovoltaic Devices.
The Journal of Physical Chemistry C: Energy Conversion and Storage, Optical and Electronic Devices, Interfaces, Nanomaterials, and Hard Matter.
16640-16645.
2007
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The Effect of Atmosphere and ZnO Morphology on the Performance of Hybrid Poly(3-hexylthiophene)/ZnO Nanofiber Photovoltaic Devices.
The Journal of Physical Chemistry C: Energy Conversion and Storage, Optical and Electronic Devices, Interfaces, Nanomaterials, and Hard Matter.
16670-16678.
2007
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Bulk heterojunctions based on a low band gap copolymer of thiophene and benzothiadiazole.
Solar Energy Materials and Solar Cells.
1631-1637.
2007
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Band-offset engineering for enhanced open-circuit voltage in polymer-oxide hybrid solar cells.
Advanced Functional Materials.
264-269.
2007
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Photoinduced charge carrier generation in a poly(3-hexylthiophene) and methanofullerene bulk heterojunction investigated by time-resolved terahertz spectroscopy.
The Journal of Physical Chemistry B: Biophysical Chemistry, Biomaterials, Liquids, and Soft Matter.
25462-25471.
2006
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Inverted bulk-heterojunction organic photovoltaic device using a solution-derived ZnO underlayer.
Applied Physics Letters.
2006
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Bulk heterojunction organic photovoltaic devices based on phenyl-cored thiophene dendrimers.
Applied Physics Letters.
2006
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Organic solar cells with carbon nanotubes replacing In2O3 : Sn as the transparent electrode.
Applied Physics Letters.
2006
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Dependence of band offset and open-circuit voltage on the interfacial interaction between TiO2 and carboxylated polythiophenes.
The Journal of Physical Chemistry B: Biophysical Chemistry, Biomaterials, Liquids, and Soft Matter.
3257-3261.
2006
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Hybrid photovoltaic devices of polymer and ZnO nanofiber composites.
Thin Solid Films.
26-29.
2006
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Conducting polymer and hydrogenated amorphous silicon hybrid solar cells.
Applied Physics Letters.
223504-223504.
2005
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Quenching of semiconductor quantum dot photoluminescence by a pi-conjugated polymer.
The Journal of Physical Chemistry B: Biophysical Chemistry, Biomaterials, Liquids, and Soft Matter.
15927-15932.
2005
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Organic-based photovoltaics. toward low-cost power generation.
Materials Research Society (MRS) Bulletin.
10-19.
2005
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The synthesis and properties of solution processable phenyl cored thiophene dendrimers.
Journal of Materials Chemistry.
4518-4528.
2005
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Defect structural characterization of organic polymer layers.
Journal of Non-Crystalline Solids.
612-616.
2004
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Nanostructured p–n Junctions for Printable Photovoltaics.
Materials Research Society (MRS) Bulletin.
43-47.
2004
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Hybrid organic-inorganic photoconductive diode.
Applied Physics Letters.
3404-3406.
2003
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Dependence of field-effect hole mobility of PPV-based polymer films on the spin-casting solvent.
Organic Electronics.
105-110.
2002
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Influence of the anodic work function on the performance of organic solar cells..
ChemPhysChem: a European journal of chemical physics and physical chemistry.
795-799.
2002
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Effect of LiF/metal electrodes on the performance of plastic solar cells.
Applied Physics Letters.
1288-1290.
2002
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Synthesis and Characterization of a Poly(1,3-dithienylisothianaphthene) Derivative for Bulk Heterojunction Photovoltaic Cells.
The Journal of Physical Chemistry B: Biophysical Chemistry, Biomaterials, Liquids, and Soft Matter.
11106-11113.
2001
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Fabrication of bulk heterojunction plastic solar cells by screen printing.
Applied Physics Letters.
2996-2998.
2001
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Low band-gap polymeric photovoltaic devices.
Synthetic Metals.
1583-1584.
2001
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Organic photovoltaic devices produced from conjugated polymer / methanofullerene bulk heterojunctions.
Synthetic Metals.
1517-1520.
2001
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2.5% efficient organic plastic solar cells.
Applied Physics Letters.
841-843.
2001
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High T/sub g/ hole transport polymers for the fabrication of bright and efficient organic light-emitting devices with an air-stable cathode.
IEEE Journal of Quantum Electronics.
12-17.
2000
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Covalently Interlinked Organic LED Transport Layers via Spin-Coating/Siloxane Condensation.
Advanced Materials.
730-734.
1999
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Energy and charge transfer in organic light-emitting diodes: A soluble quinacridone study.
Journal of Applied Physics.
7939-7945.
1999
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Organic light-emitting diode with 20 lm/W efficiency using a triphenyldiamine side-group polymer as the hole transport layer.
Applied Physics Letters.
3212-3214.
1999
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Self-Assembly Processes for Organic LED Electrode Passivation and Charge Injection Balance.
Advanced Materials.
227-231.
1999
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Organic Two-Layer Light-Emitting Diodes Based on High-TgHole-Transporting Polymers with Different Redox Potentials.
Chemistry of Materials.
399-407.
1999
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A numerical study of operational characteristics of organic light-emitting diodes.
Journal of Applied Physics.
5306-5314.
1998
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Synthesis and Characterization of Poly(2,5-bis(N-methyl-N-hexylamino)phenylene vinylene), a Conjugated Polymer for Light-Emitting Diodes.
Macromolecules.
7566-7569.
1998
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Electrochemistry and Electrogenerated Chemiluminescence Processes of the Components of Aluminum Quinolate/Triarylamine, and Related Organic Light-Emitting Diodes.
Journal of the American Chemical Society.
9646-9655.
1998
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Bright blue organic light-emitting diode with improved color purity using a LiF/Al cathode.
Journal of Applied Physics.
2324-2327.
1998
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New Triarylamine-Containing Polymers as Hole Transport Materials in Organic Light-Emitting Diodes: Effect of Polymer Structure and Cross-Linking on Device Characteristics.
Chemistry of Materials.
1668-1676.
1998
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Exciplex Electroluminescence from Organic Bilayer Devices Composed of Triphenyldiamine and Quinoxaline Derivatives.
Advanced Materials.
230-233.
1998
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Highly efficient and bright organic electroluminescent devices with an aluminum cathode.
Applied Physics Letters.
1762-1764.
1997
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A model for the current–voltage characteristics and the quantum efficiency of single-layer organic light emitting diodes.
Applied Physics Letters.
1290-1292.
1997
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Substituted Aluminum and Zinc Quinolates with Blue-Shifted Absorbance/Luminescence Bands: Synthesis and Spectroscopic, Photoluminescence, and Electroluminescence Characterization.
Chemistry of Materials.
344-351.
1996
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Neuromorphic-based Boolean and reversible logic circuits from organic electrochemical transistors.
Materials Research Society (MRS) Bulletin.
649-654.
2020
Teaching
courses taught
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ECEN 2060 - Special Topics
Primary Instructor - Fall 2019 / Fall 2020
Examines a special topic in Electrical, Computer and Energy Engineering. May be repeated up to 9 total credit hours. Recommended prerequisite or corequisite: PHYS 1140. -
ECEN 2250 - Introduction to Circuits and Electronics
Primary Instructor - Spring 2019
Introduces linear circuit analysis and design, including OP-Amps. Presents DC networks, including node and mesh analysis with controlled sources. Analysis of RL and RC circuits for both transient and sinusoidal steady-state responses using phasors. Recommended prerequisites: ECEN 1310 or CSCI 1300. -
ECEN 3400 - Electromagnetic Fields and Waves
Primary Instructor - Spring 2018
Electromagnetic fields are covered at an introductory level, starting with electrostatics and continuing with DC current, magnetostatics, time-varying magnetic fields, waves on transmission lines, Maxwell's equations and the basics of plane waves. The use of fields in inductors, capacitors, resistors, transformers, and energy and power concepts are studied. -
ECEN 4005 - Special Topics
Primary Instructor - Spring 2019 / Spring 2021
Examines a special topic in Electrical, Computer and Energy Engineering. May be repeated up to 9 total credit hours. -
ECEN 5005 - Special Topics
Primary Instructor - Spring 2019 / Spring 2021
Examines a special topic in Electrical, Computer and Energy Engineering. May be repeated up to 9 total credit hours. -
ECEN 6950 - Master's Thesis
Primary Instructor - Fall 2019 / Spring 2020
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Background
education and training
- Ph.D., University of Arizona 1999
- B.S., Carnegie Mellon University 1991
awards and honors
International Activities
global connections related to teaching and scholarly work (in recent years)
- Brazil Country
- France Country
- Germany Country
- India Country
- Italy Country
- Netherlands Country
- Saudi Arabia Country
- Singapore Country
- Slovenia Country
- Switzerland Country
- Ukraine Country
- United Arab Emirates Country
- United Kingdom Country