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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-23 18:06 |
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Conference: Bucharest University Faculty of Physics 2009 Meeting
Section: Solid State Physics and Materials Science
Title:
Electrical and Optical Characterization of Photovoltaic Cells Based on Polymer Blends P3HT: PCBM (1:1)
Authors:
Sorina IFTIMIE(1), Cristina BESLEAGA(1), Polona SKRABA(2), C.TAZLAOANU(1), Larisa MAGHERUSAN(1), T. ALIONTE(1), L. ION(1), G.BRATINA(2), S. ANTOHE(1)
Affiliation:
(1)University of Bucharest, Faculty of Physics, 405 Atomistilor Street, PO Box MG-11, 077125, Magurele-Ilfov, Romania
(2)University of Nova Gorica ,Vipavska 13, POB 301 SI-5000 Nova Gorica, Slovenia
E-mail
santohe@solid.fizica.unibuc.ro
Keywords:
polymer blends, bulk-heterojunction, P3HT, PCBM
Abstract:
Photovoltaic structures based on polymer blends, in the sequence ITO/PEDOT/ P3HT: PCBM (1:1)/Al were prepared, using optical glass substrates covered with 30 nm thick ITO. PEDOT and P3HT: PCBM layers were deposited by using the spin-coating technique, while Al back-electrode was deposited by thermal vacuum evaporation. Current-Voltage (I-V) characteristics, in the dark and under illumination through ITO electrode of the structures were measured. The non-linearity and asymmetry of the measured I-V characteristics were explained in terms of electrode/organic semiconductor interface behavior. Action spectra of the cells revealed the features also observed in absorption spectra of the component polymers or the blend. A fill factor (FF) of 28%, higher than in the case of single layer structures was measured experimentally for the blend structures. The power conversion efficiency on 0.44%, of the as prepared blend structures was higher, too, than those of the single layer structures based on the ordinary P3HT and PCBM layer, respectively. The fourth quadrant parameters of the blend structures, determined in monochromatic light, change in time with respect of their values obtained on as prepared samples.
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