Quantum Efficiency Gain in 2D Perovskite Photo and X‐Ray Detectors

The perovskite polycrystalline thin film detector fabricated by solution method is a promising low‐cost, scalable technology for radiation imaging, but its thin volume limits the sensing efficiency for high‐energy X‐ray photons. This work reports 2D perovskite thin film photo‐diodes with a detection...

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Bibliographic Details
Published in:Advanced optical materials 2023-12, Vol.11 (23), p.n/a
Main Authors: Tsai, Hsinhan, Pan, Lei, Li, Xinxin, Yoo, Jinkyoung, Tretiak, Sergei, Ma, Xuedan, Cao, Lei R., Nie, Wanyi
Format: Article
Language:English
Subjects:
2D perovskites
charge multiplication
Efficiency
Electron transport
High gain
Optoelectronics
Perovskites
Phenylethylamine
Photons
Quantum efficiency
Temperature dependence
Thin films
X‐ray detector
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Summary:The perovskite polycrystalline thin film detector fabricated by solution method is a promising low‐cost, scalable technology for radiation imaging, but its thin volume limits the sensing efficiency for high‐energy X‐ray photons. This work reports 2D perovskite thin film photo‐diodes with a detection gain when sensing visible and X‐ray photons. Detailed power and temperature‐dependent device characterizations reveal a charge multiplication effect to be responsible for the observed high gain. This is caused by a disparity in electron and hole transport, where electron transport is retarded by a trap/de‐trap process via shallow trap states, whereas the hole transport is fast enough to produce a photoconductive gain in satisfying the charge neutrality. The 2D perovskite made with butylamine spacers is also found to exhibit a larger efficiency gain than those made with phenylethylamines because of the higher likelihood of forming shallow traps in the former. The thin film diodes feature a high temporal response over 1 MHz due to the fast charge collection across a thin volume, and the discovery provides device physics mechanisms in connection to material structure‐function relationship for future optoelectronics design that can boost the efficiency of X‐ray sensing and dim light detection. Perovskite semiconductors are promising X‐ray sensing materials emerging in recent years. The enormous sensitivity values are attracting much attention and are attributed to a photo‐conductive gain mechanism. This work reports a gain mechanism in a 2D perovskite thin film photodiode that is tied to the shallow trap.
ISSN:2195-1071
2195-1071
DOI:10.1002/adom.202300847