受体浓度影响体异质结有机太阳能电池复合损耗研究

制备基于P3HT:PCBM的复合体异质结太阳能电池 ,研究受体浓度对载流子复合特性的影响。测试结果表明, 受体浓度影响器件的电荷收集和复合损耗, 从而直接影响体异质结有机太阳能电池的光电性能； 光生电流随偏 置电压的增加而下降,光生电流下降趋势反映了载流子的复合损耗特性。理论分析进一步 表明,给体中电子与受体中 电子的密度比与受体浓度有直接关系,受体浓度改变双分子复合常数的大小,从而影响载流 子的复合特性。

Effects of acceptor concentration on the recombination loss of organic bulk heterojunction solar cells

In order to investigate the bimolecular recombination of generated car riers in a bulk heterojunction blend and the effects of acceptor concentration on recombination properties at the donor-acceptor int erface,we fabricated the bulk heterojunction organic solar cells based on compositional blend of P3HT and PCBM.Test results show that the acceptor concentration affects the photoelectric p roperties of bulk heterojunction organic solar cells, the device charge collection,and also the recombin ation loss.It shows a decrease in photocurrent with increasing bias voltage,and the photocurrent decline reflects the recombination loss characteristics of carrier at the donor-acceptor interface.The theoretical analysis further indicates that a ratio between e lectrons in the acceptor to electrons in the donor has a direct relationship with the acceptor concentration,and acceptor concentration changes the size of the bimolecular recombination constant,influencing the recombination properties of carrier.The studies in this paper are useful for further improving the photoelectric c onversion efficiency of organic solar cells.