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Dependence of recombination mechanisms and strength on processing conditions in polymer solar cells
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/content/aip/journal/apl/99/26/10.1063/1.3671999
2011-12-27
2014-08-23

Abstract

Charge carrier recombination due to carrier trapping is not often considered in polymer based solar cells, except in those using non-fullerene acceptors or new donor polymers with limited short-range order. However, we show that even for the canonical poly(3-hexylthiophene): phenyl-C61-butyric acid methyl ester (P3HT:PCBM) system, relative strengths of bimolecular and trap-assisted recombination are strongly dependent on processing conditions. For slow-grown active-layers, bimolecular recombination is indeed the major loss mechanism under one sun illumination. However, for fast-grown active-layers, trap-assisted recombination dominates over bimolecular recombination by an order of magnitude, and recombination strength at short-circuit condition is 3-4 times higher, leading to loss of photocurrent and lowering of fill factor.

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Scitation: Dependence of recombination mechanisms and strength on processing conditions in polymer solar cells
http://aip.metastore.ingenta.com/content/aip/journal/apl/99/26/10.1063/1.3671999
10.1063/1.3671999
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