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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 2:29 |
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Conference: Bucharest University Faculty of Physics 2003 Meeting
Section: Electricity and Biophysics
Title:
Photovoltaic Cells Based on Organic Thin Layers
Authors:
Stefan Antohe
Affiliation:
Faculty of Physics, University of Bucharest, P.O.Box MG-11,
Bucharest-Magurele, 76900 ROMANIA
E-mail
Keywords:
Abstract:
In this work are summarized the electrical and photoelectrical properties of the organic photovoltaic cells based on the organic thin layers. Starting with the single-layer photovoltaic structures, the ITO/CuPc/Al and ITO/TPyP/Al has been prepared and characterised, where the organic layers of CuPc and TPyP, are Copper Phthalocyanine and 5,10,15,20-Tetra (4-Pyrydil)21H,23H-Porphine, respectively. The photovoltaic structures based on the p-n heterojunction present at the interface between two organic layers, like, ITO/CuPc/TPyP/Al and ITO/Chl a/TPyP/Al, exhibits stronger spectral sensitivity and better spectral matching to a solar spectrum than Schottky cells using either CuPc or TPyP, layer. Three-layered organic solar cells with an interlayer of codeposited dyes of p-type CuPc and n-type TPyP, between the respective dye layers were also prepared and characterized. They showed increased power conversion efficiency, due to the efficient carrier photogeneration in the enlarged photoactive region from the codeposited layer. The spectral sensitization of an a-Si:H solar cell using an organic layer was also obtained. The action spectrum was extended by 30 nm to longer wavelength range, using a 100 nm thick layer of TPyP. An exciton dissociation process explains the sensitization to the TPyP/a-Si:H interface, which gives rise of higher quantum efficiency at longer wavelengths.
Keywords: organic semiconductors, photovoltaic cells, organic thin layers
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