Making Solar Cells D Venkataraman DV Department of
![Organic Photovoltaic Cells Poly(3 -hexylthiophene) (P 3 HT) 100 nm PCBM – [6, 6]-phenyl-C](https://slidetodoc.com/presentation_image_h/0a82332ec8eb1fdf989d170eba3a8560/image-7.jpg "Organic Photovoltaic Cells Poly(3 -hexylthiophene) (P 3 HT) 100 nm PCBM – [6, 6]-phenyl-C")
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Making Solar Cells D. Venkataraman (DV) Department of Chemistry Umass Amherst dv@chem. umass. edu June 29, 2010
Photovoltaic Cells Exciton Active Material Efficiency of Photovoltaic Cells Depend on v. Absorption in the Solar Spectrum v. Charge Separation v. Charge Mobility v. Charge Collection
Source: National Renewable Energy Laboratory
Cost Efficiency Organic Photovoltaic Devices Stability End-User Application Home Depot/BP Solar Konarka
What is the Problem? Si or III-V Cells Organic/Hybrid/Dyesensitized Exciton diffusion distance >100 nm 10 nm Exciton diffusion distance <10 nm Excitons loosely bound Excitons tightly bound (Frenkel Excitons) Low dielectric constant Gregg, B. A. , Excitonic solar cells. Journal of Physical Chemistry B 2003, 107 (20), 4688 -4698.
Efficiency Cost Stability Active Material p-conjugated molecules /polymers Active Layer Morphologies Intrinsic Electrode/Active Layer Interfaces Device Fabrication/ Encapsulation Extrinsic
Organic Photovoltaic Cells Poly(3 -hexylthiophene) (P 3 HT) 100 nm PCBM – [6, 6]-phenyl-C 61 -butyric acid methyl ester Bulk Heterojunction Cells Efficiency ~ 5% Padinger, F. ; Rittberger, R. S. ; Sariciftci, N. S. , Effects of postproduction treatment on plastic solar cells. Advanced Functional Materials 2003, 13 (1), 85 -88. Ma, W. L. ; Yang, C. Y. ; Gong, X. ; Lee, K. ; Heeger, A. J. "Thermally stable, efficient polymer solar cells with nanoscale control of the interpenetrating network morphology, " Advanced Functional Materials 2005, 1617 -1622.
