Achieving EQE of 16,700% in P3HT:PC71BM based photodetectors by trap-assisted photomultiplication

Scientific Reports
Lingliang LiFeng Teng

Abstract

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.

References

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Citations

Feb 7, 2017·Nano Letters·Wenbin WangJinsong Huang
May 23, 2017·Physical Chemistry Chemical Physics : PCCP·Jianli MiaoYing Fang
Feb 22, 2017·Scientific Reports·Mohammadreza FathollahiMohammadrasoul Babaei
Nov 4, 2015·Physical Chemistry Chemical Physics : PCCP·Lingliang LiJinsong Huang
Apr 18, 2018·Chemical Society Reviews·Francesca Di MariaGuglielmo Lanzani
Aug 3, 2019·Advanced Materials·Philip C Y Chow, Takao Someya
Aug 24, 2019·Nanoscale·Jianli MiaoFujun Zhang
Apr 26, 2016·Advanced Materials·Ross D Jansen-van VuurenPaul Meredith
Sep 14, 2018·Nanomaterials·Linlin ShiYanxia Cui
Feb 18, 2020·Science Advances·Zhaojue LanFurong Zhu
Jun 14, 2019·Science and Technology of Advanced Materials·Roland HanyKaren Strassel
Oct 28, 2020·Nanotechnology·Chun-Ying HuangChia-Tse Yuan
Jan 23, 2021·Physical Chemistry Chemical Physics : PCCP·Meng-Yao LiuFu-Jun Zhang
Jan 14, 2021·Advanced Science·Hao RenJian-Xin Tang
Dec 25, 2019·The Journal of Physical Chemistry Letters·Zijin ZhaoFujun Zhang
May 2, 2018·Nano Letters·Xin XuAnanth Dodabalapur
Oct 28, 2021·Materials Horizons·Yazhong WangKarl Leo

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