Influence of electronic transport properties of polymer-fullerene blends on the performance of bulk heterojunction photovoltaic devices
Influence of electronic transport properties of polymer-fullerene blends on the performance of bulk heterojunction photovoltaic devices
复制标题
DOI：
10.1002/pssa.200404333
复制
发表时间：
2004-05-01
影响因子：
2
通讯作者：
Dyakonov, V
中科院分区：
文献类型：
--
作者：
Riedel, I;Dyakonov, V
本文讨论了以共轭聚合物聚(2-methoxy-5-(3-，7-dimethyl-octyloxy)-1，4-phenylene乙烯(OC1C10-PPV)和区域规则聚(3-己基噻吩基)(P3HT)分别与受体型甲基富勒烯[6，6]-苯基-C-61-丁酸甲酯共混的聚合物-富勒烯体相异质结太阳电池的光伏特性。尽管这两种材料组合的器件在功率转换效率方面表现出良好的性能，但它们的电子传输行为却非常不同。基于OC1C10-PPV的太阳能电池的光电流分布显示出强烈的温度依赖性，反映出电流受到吸收层中光生载流子复合的限制。相比之下，具有P3HT：PCBM有源层的器件在一定温度以上显示出与温度无关的光电流，这表明载流子的传输和提取没有显著地受到损耗的衰减，即在器件工作条件下，光生电荷载流子的平均漂移长度超过了有源层的厚度。因此，由于光吸收的改善，可以增加有源层厚度，从而导致较高的短路电流值。(C)2004年Wiley-VCH Verlag GmbH&Co.KGaA。温海姆。
The photovoltaic proper-ties of polymer-fullerene bulk-heterojunction solar cells with light absorbers based on the conjugated polymers poly (2-methoxy-5-(3-,7-dimethyl-octyloxy)-1,4-phenylene vinylene (OC1C10-PPV) and regioregular poly(3-hexyl thiophene) (P3HT), each blended with the acceptor-type methanofullerene [6,6]-phenyl-C-61-butyric acid methyl ester (PCBM), are discussed. Although devices with both material combinations demonstrate good performance in terms of power conversion efficiency, they are very different in their electronic transport behavior. The profiling of the photocurrent in solar cells based on OC1C10-PPV shows a strong temperature dependence reflecting that the current is limited by the recombination of photogenerated charge carriers in the absorber layer. In contrast, devices with P3HT: PCBM active layers display a temperature independent photocurrent above some temperature, indicating that the transport and extraction of charge carriers are not significantly attenuated by losses, i.e., the mean drift length of photogenerated charge carriers exceeds the active layer thickness under device operating conditions. Therefore the active layer thickness could be increased resulting in high values of short-circuit current due to improved light absorption. (C) 2004 WILEY-VCH Verlag GmbH & Co. KGaA. Weinheim.