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

Nature Communications
Boming XieYong Cao

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.

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Citations

Mar 17, 2021·The Journal of Physical Chemistry Letters·Ming LiuFujun Zhang
Jun 19, 2021·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Wenkai ZhongCheng Wang
Oct 28, 2021·Materials Horizons·Yazhong WangKarl Leo

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