文章基本信息

标题：Achieving EQE of 16,700% in P3HT:PC71BM based photodetectors by trap-assisted photomultiplication
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作者：Lingliang Li ; Fujun Zhang ; Jian Wang 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2015
卷号：5
期号：1
DOI：10.1038/srep09181
语种：English
出版社：Springer Nature
摘要：We report a trap-assisted photomultiplication (PM) phenomenon in solution-processed polymer photodetectors (PPDs) based on P3HT:PC₇₁BM as the active layer, the maximum EQE of 16,700% is obtained for the PPDs with PC₇₁BM doping weight ratio of 1%. The PM phenomenon is attributed to the enhanced hole tunneling injection assisted by trapped electrons in PC₇₁BM near Al cathode, which can be demonstrated by the transient photocurrent curves and EQE spectra of PPDs with different PC₇₁BM doping ratios. The positive effect of trapped electrons in PC₇₁BM near Al cathode on the hole tunneling injection is further confirmed by the simulated optical field and exciton generation rate distributions in the active layer and the EQE spectra of PPDs with Al(1)/P3HT:PC₇₁BM(100:1)/Al(2) device structure under forward and reverse biases. This discovery may open a new road for organic materials to be used in highly sensitive photodetectors while preserving the advantages of organic materials.