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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 1:21 |
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Conference: Bucharest University Faculty of Physics 2013 Meeting
Section: Solid State Physics and Materials Science
Title:
Bulk heterojunction photovoltaic cells on flexible support
Authors:
Oana Brincoveanu, A. Radu, Sorina Iftimie, S. Antohe
Affiliation:
University of Bucharest, Faculty of Physics
E-mail
oana_brincoveanu@yahoo.com
Keywords:
photovoltaic cells, organic polymers, MEH-PPV, PCBM
Abstract:
The goal of this study is to demonstrate the importance of PEDOT:PSS “buffer” layer on the photovoltaic performances of structures based on organic materials (MEH-PPV:PCBM polymeric blends). Special attention is given to bulk heterojunction structures for which the acceptor and the donor are mixed together and deposited as thin layer by spin-coating technique. To improve the photovoltaic performance, PEDOT:PSS was used as “buffer” layer between the anode and the active film. The active layer is a mixture between poly{[2-[2’,5’-bis(2”-ethyhexyloxy)phenyl]-1,4-phenylenevinylene]-co-[2-methoxy-5-(2’-ethylexyloxy)-1,4-phenylenevinylene]} (MEH-PPV), a regioregular polymer, and [6,6]-phenyl C61 butyric acid methyl ester (PCBM), the fullerene derivative, and was deposited onto optical glass and plastic sheets covered with ITO, as substrates. The difference between the samples is the presence or not of poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS). Its electrical conductivity is not very high, but it can be improved by adding nanotubes and/or ZnO nanoparticles.
The optical and electrical properties were analyzed for the samples with and without PEDOT:PSS thin layer and the parameters characterizing photovoltaic cells were calculated and compared (short-circuit current, open circuit voltage and fill factor). Moreover, the current-voltage (I-V) characteristics in monochromatic light and the action spectra of the prepared structures were recorded, at room temperature.
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