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Broadband organic photodetectors exhibiting photomultiplication with a narrow bandgap non-fullerene acceptor as an electron trap

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Abstract

Broadband organic photodetectors with photomultiplication (PM-OPDs) can be realized in the device structures of ITO/PEDOT:PSS/active layers/Al, where the active layers contain one broad bandgap polymer PDBD-T and a much lower amount of the ultra-narrow bandgap material, IEICO-4F. The active layers have an efficient single carrier (hole) transport property, leading to the low dark current of the PM-OPDs. The rather low amount of IEICO-4F surrounded by PBDB-T will become some isolated electron traps due to their differences in the lowest unoccupied molecular orbital levels. The photogenerated holes will be efficiently transported along the channels formed by PBDB-T, and the photogenerated electrons will prefer to be trapped in the isolated IEICO-4F. The trapped electrons in IEICO-4F near the Al electrode will induce interfacial band bending for the hole tunneling injection, achieving the photomultiplication phenomenon. The optimal PM-OPDs with PBDB-T : IEICO-4F (100 : 3, wt/wt) as active layers exhibited an external quantum efficiency (EQE) of >100% in the spectral range from 310 nm to 850 nm. The EQE of PM-OPDs can reach 1350% at 675 nm and 400% at 850 nm under −20 V bias. The ultra-narrow bandgap material IEICO-4F plays vital roles in realizing the PM phenomenon and extending the near infrared spectral response range.

Graphical abstract: Broadband organic photodetectors exhibiting photomultiplication with a narrow bandgap non-fullerene acceptor as an electron trap

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Supplementary files

Article information


Submitted
11 Apr 2020
Accepted
14 Jun 2020
First published
15 Jun 2020

J. Mater. Chem. C, 2020, Advance Article
Article type
Paper

Broadband organic photodetectors exhibiting photomultiplication with a narrow bandgap non-fullerene acceptor as an electron trap

M. Liu, J. Miao, J. Wang, Z. Zhao, K. Yang, X. Zhang, H. Peng and F. Zhang, J. Mater. Chem. C, 2020, Advance Article , DOI: 10.1039/D0TC01793K

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