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Shen Xing

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Proceedings Article | 20 August 2020 Poster

Organic thin-film red-light photodiodes with tunable spectral response via selective exciton activation

Shen Xing, Xiao Wang, Erjuan Guo, Hans Kleemann, Karl Leo

Proceedings Volume 11475, 1147515 (2020) https://doi.org/10.1117/12.2567625

KEYWORDS: Excitons, Thin films, Photodiodes, Optical imaging, Optical communications, Machine vision, Deposition processes, Organic semiconductors, Heterojunctions, Computer architecture

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Red light detection is vital for numerous applications, including full-color imaging, optical communication, machine vision, etc. However, this development is hindered by a limited choice of small bandgap and narrow bandwidth materials. To solve this problem, the promising strategy of charge collection narrowing has been devised which requires a relatively thick active layer, usually beyond 1.5 μm, to suppress surface-generated carriers thus ensuring the purity of red-light response spectrum, while restricting device frequency bandwidth and introducing extra uncertainties with high throughput deposition methods. Therefore, the realization of thin-film, red-light OPDs would dramatically enhance its potential utility and extend the available range of suitable organic semiconductors. In this work, the selective exciton activation mechanism is applied to a simple planar heterojunction architecture, which enables only specific excitons separated into free charge carriers, while all other excitons are quenched before reaching the donor/acceptor interface. Such a mechanism makes the design of red-light detectivity spectrum even with a considerably thin active layer feasible. By adjusting the ratio of PTB7 in P3HT, an obvious increase of photoresponse is obtained with a peak shift from 645 nm to 745 nm. Moreover, the 90 wt.% PTB7 addition gives high photoresponsivity at 745 nm simultaneously keeping a narrow full-width at-half-maximum of ~50 nm. Highly competitive performance in terms of specific detectivity and linear dynamic range is demonstrated. Therefore, this design concept is intriguing for tunable thin-film filter-less red-light organic photodiodes and also applicable to other spectral windows in the near future.

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