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

Wanyi Nie; Hsinhan Tsai; Kendon Shirley

doi:10.1117/12.2675939

5 October 2023 Perovskite thin film and heterostructure detectors for X-ray and visible photons

Wanyi Nie, Hsinhan Tsai, Kendon Shirley

Proceedings Volume PC12650, Physical Chemistry of Semiconductor Materials and Interfaces XXII; PC1265006 (2023) https://doi.org/10.1117/12.2675939
Event: SPIE Nanoscience + Engineering, 2023, San Diego, California, United States

Abstract

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.

Conference Presentation

Citation Download Citation

Wanyi Nie, Hsinhan Tsai, and Kendon Shirley "Perovskite thin film and heterostructure detectors for X-ray and visible photons", Proc. SPIE PC12650, Physical Chemistry of Semiconductor Materials and Interfaces XXII, PC1265006 (5 October 2023); https://doi.org/10.1117/12.2675939

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