Organic Electronics ( IF 3.2 ) Pub Date : 2020-03-17 , DOI: 10.1016/j.orgel.2020.105700 Yongqiang Wang , Tao An , Jiawei Xue
A new method for realizing the response broadening of organic photodetectors (OPDs) using highly ordered polymer PCPDTBT doping has been proposed in this paper. The effects of PCPDTBT doping on the optical and electrical properties of OPDs were investigated experimentally. It was found that when the mass ratio of PTB7:PCPDTBT:PC61BM was 8.5:1.5:15, the response spectrum of the OPDs was broadened to 380-830 nm. The responsivity (R) and external quantum efficiency (EQE) of the OPDs reached 396, 244, 189 mA/W and 78%, 57%, 51% under 630, 530 and 460 nm illumination and −1 V bias, respectively, and the detectivity (D*) reached 1011 Jones. The results showed that the addition of PCPDTBT to PTB7:PC61BM increased the absorption of light at 700-830 nm. At the same time, the addition of PCPDTBT promotes the exciton dissociation interface in the active layer from the original one to the current three, they are PTB7:PCPDTBT, PTB7:PC61BM and PCPDTBT:PC61BM, which increase the probability of exciton dissociation in the active layer. In addition, the addition of highly ordered polymer PCPDTBT promotes the crystallization of the film and optimizes the carrier transport of the film. These synergistic effects promote the photocurrent of the OPDs.
中文翻译:
通过掺杂高度有序的聚合物PCPDTBT,在可见光波长下实现高探测性的有机光电探测器
本文提出了一种利用高度有序的聚合物PCPDTBT掺杂实现有机光电探测器(OPD)响应扩展的新方法。实验研究了PCPDTBT掺杂对OPD光学和电学性质的影响。发现当PTB7∶PCPDTBT∶PC 61 BM的质量比为8.5∶1.5∶15时,OPD的响应光谱扩大到380-830nm。在630、530和460 nm照明和-1 V偏压下,OPD的响应度(R)和外部量子效率(EQE)分别达到396、244、189 mA / W和78%,57%,51%。侦探率(D *)达到10 11琼斯。结果表明,将PCPDTBT添加到PTB7:PC 61中BM增加了700-830 nm处的光吸收。同时,添加PCPDTBT可以将有源层中的激子离解界面从原来的一个促进到当前的三个,它们是PTB7:PCPDTBT,PTB7:PC 61 BM和PCPDTBT:PC 61 BM,从而增加了活性层中的激子离解。此外,添加高度有序的聚合物PCPDTBT可以促进薄膜的结晶并优化薄膜的载流子传输。这些协同效应促进了OPD的光电流。