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Photocurrent transients in polymer-fullerene bulk heterojunction organic solar cells

机译:聚合物-富勒烯本体异质结有机太阳能电池中的光电流瞬变

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By measuring the transient photocurrents we study the charge carrier dynamics in regioregular poly(3-hexylthiophene) (P3HT): 6,6-phenyl-C61-butyric acid methyl ester (PCBM), and poly(3-hexylthiophene) thiophene thienopyrazine (P3HTT-TP):PCBM bulk heterojunction (BHJ) solar cells. The latter is based on a novel “semi-random” copolymer and exhibits broad spectral absorption. We observe that the charge carrier transport in P3HTT-TP:PCBM is more imbalanced than that of P3HT:PCBM. Voltage dependent photocurrent transients indicate that P3HT:PCBM has longer carrier lifetimes than P3HTT-TP:PCBM. Light intensity dependent open-circuit voltage measurements show stronger monomolecular recombination in P3HTT-TP:PCBM. The unfavorable charge carrier transport may be one of the reasons for the low power conversion efficiency of P3HTT-TP:PCBM BHJ solar cells.
机译:通过测量瞬态光电流,我们研究了区域规则的聚(3-己基噻吩)(P3HT):6,6-苯基-C61-丁酸甲酯(PCBM)和聚(3-己基噻吩)噻吩噻吩并嗪(P3HTT)的电荷载流子动力学-TP):PCBM本体异质结(BHJ)太阳能电池。后者基于一种新型的“半无规”共聚物,并具有宽广的光谱吸收率。我们观察到,P3HTT-TP:PCBM中的载流子传输比P3HT:PCBM中的载流子传输更加不平衡。电压相关的光电流瞬变表明,P3HT:PCBM具有比P3HTT-TP:PCBM更长的载流子寿命。光强度相关的开路电压测量结果表明,P3HTT-TP:PCBM中的单分子重组更强。不利的电荷载流子传输可能是P3HTT-TP:PCBM BHJ太阳能电池功率转换效率低的原因之一。

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