Issue 6, 2019

Enhancing the performance of photomultiplication-type organic photodetectors using solution-processed ZnO as an interfacial layer

Abstract

As a promising alternative to conventional photodiode-type organic photodetectors (OPDs), photomultiplication (PM)-type OPDs can achieve much higher external quantum efficiencies (EQEs) over 100% and work as optical amplifiers for real applications. Here, high-performance PM-type OPDs with a structure of ITO/ZnO/P3HT : O-IDTBR (100 : 1, w/w)/Al are fabricated by using solution-processed zinc oxide (ZnO) as an interfacial layer. The resulting OPDs exhibit a broad spectral-response range (EQE > 100%) from 300 to 780 nm under −15 V bias, while the range is only from 320 to 720 nm for the OPDs with a poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) interfacial layer. The extended spectral-response in the ultraviolet (UV) region for the OPDs based on ZnO is attributed to the fact that UV light can be absorbed by the ZnO interfacial layer. Under −15 V bias, the optimized ZnO-based OPDs exhibit the highest EQE of 3660%, with a responsivity of 12.10 A W−1 and a detectivity of 1.02 × 1013 Jones at 410 nm. By contrast, optimized PEDOT:PSS-based OPDs show an EQE of 1010%, with a responsivity of 3.34 A W−1 and a detectivity of 1.47 × 1012 Jones under the same conditions. Compared with the PEDOT:PSS-based OPDs, the ZnO-based OPDs show a broader spectral-response range with more than 2.6 times larger EQE and responsivity, as well as more than 5.9 times larger detectivity in a short wavelength range under −15 V bias.

Graphical abstract: Enhancing the performance of photomultiplication-type organic photodetectors using solution-processed ZnO as an interfacial layer

Supplementary files

Article information

Article type
Paper
Submitted
01 Oct 2018
Accepted
03 Jan 2019
First published
04 Jan 2019

J. Mater. Chem. C, 2019,7, 1544-1550

Enhancing the performance of photomultiplication-type organic photodetectors using solution-processed ZnO as an interfacial layer

J. Wang and Q. Zheng, J. Mater. Chem. C, 2019, 7, 1544 DOI: 10.1039/C8TC04962A

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