Self-filtering narrowband high performance organic photodetectors enabled by manipulating localized Frenkel exciton dissociation

Boming Xie, Ruihao Xie, Kai Zhang (), Qingwu Yin, Zhicheng Hu, Gang Yu, Fei Huang () and Yong Cao
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Boming Xie: South China University of Technology
Ruihao Xie: South China University of Technology
Kai Zhang: South China University of Technology
Qingwu Yin: South China University of Technology
Zhicheng Hu: South China University of Technology
Gang Yu: South China University of Technology
Fei Huang: South China University of Technology
Yong Cao: South China University of Technology

Nature Communications, 2020, vol. 11, issue 1, 1-9

Abstract: Abstract The high binding energy and low diffusion length of photogenerated Frenkel excitons have long been viewed as major drawbacks of organic semiconductors. Therefore, bulk heterojunction structure has been widely adopted to assist exciton dissociation in organic photon-electron conversion devices. Here, we demonstrate that these intrinsically “poor” properties of Frenkel excitons, in fact, offer great opportunities to achieve self-filtering narrowband organic photodetectors with the help of a hierarchical device structure to intentionally manipulate the dissociation of Frenkel excitons. With this strategy, filter-free narrowband organic photodetector centered at 860 nm with full-width-at-half-maximum of around 50 nm, peak external quantum efficiency around 65% and peak specific detectivity over 1013 Jones are obtained, which is one the best performed no-gain type narrowband organic photodetectors ever reported and comparable to commercialized silicon photodetectors. This novel device structure along with its design concept may help create low cost and reliable narrowband organic photodetectors for practical applications.

Date: 2020
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DOI: 10.1038/s41467-020-16675-x

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