Dr. Hsinhan Tsai Profile

Dr. Hsinhan Tsai

at Los Alamos National Lab

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Proceedings Article | 5 October 2023 Presentation

Perovskite thin film and heterostructure detectors for X-ray and visible photons

Wanyi Nie, Hsinhan Tsai, Kendon Shirley

Proceedings Volume PC12650, PC1265006 (2023) https://doi.org/10.1117/12.2675939

KEYWORDS: X-rays, Perovskite, Photons, X-ray detectors, Thin films, Heterojunctions, Semiconductors, Diffusion, Photovoltaics, Materials properties

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Perovskite semiconductors are emerging low-cost materials for photovoltaics, light emitting devices and detectors. Because of the inclusion of high atomic numbered elements, perovskites are promising candidates for high efficiency X-ray sensing. In this talk, I will discuss the properties of perovskite semiconductors for X-ray and visible photon sensing. Firstly, we report a long carrier diffusion length in 2D perovskite single crystals, assisted by the shallow trap and de-trapping process. Next, we show that such a long diffusion length ensures a full charge collection after charge ionization, which is beneficial for detectors for X-ray and other photons. In addition, we have found the shallow trap also extend the carrier transport lifetime that facilitate a charge multiplication in the detector driven under high voltages. Such a process introduces a photo conductivity gain, leading to an unusually high X-ray and visible photon sensing efficiency. A high gain can be also achieved by building a hetero-structured device. Interfacing perovskites with a high mobility graphene channel can also multiplicate the photo-generated carriers. With a hetero-structured device, we show a high X-ray sensitivity over 108 µCGy-1cm-2.

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