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17 October 2013 Analysis of the thickness dependent photocurrent spectra of organic bulk heterojunction solar cells
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Abstract
We analyze the photocurrent spectra for bulk heterojunction organic solar cells having a range of active layer thicknesses. Normalized by the number of incident photons, the photocurrent peak red shifts with respect to the absorption maximum as the sample thickness increases. The shift in photocurrent peak can be understood by comparing the carrier extraction for bulk versus surface generated carriers. Fitting to the spectra provides a measure of the electron collection length and the surface enhanced recombination. The variation in the electron collection length with contacting parameters is used as a guide for optimization of the device structure. Furthermore, a photocurrent analysis has been done for different active layer thicknesses with different interfacial layers. Again the model fit for this comparison provides an estimate for carrier recombination distance that fits well with experimental data. For this study a common conjugated polymer regioregular poly(3-hexylthiophene) (P3HT) is used while poly(3,4-ethylenedioxythiophene) poly(styrenesulfonate) (PEDOT-PSS), P3HT and Al are used as interfacial layers.
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Buddika K. Abeyweera and Bruce W. Alphenaar "Analysis of the thickness dependent photocurrent spectra of organic bulk heterojunction solar cells", Proc. SPIE 8830, Organic Photovoltaics XIV, 88301O (17 October 2013); https://doi.org/10.1117/12.2023302
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