Proceedings of nanoGe Fall Meeting 2021 (NFM21)
DOI: https://doi.org/10.29363/nanoge.nfm.2021.017
Publication date: 23rd September 2021
Metal halide perovskites have fascinated the research community over the past decade, and demonstrated unprecedented success in the field of photovoltaics, light emitting devices and photodetection. In particular, perovskites have emerged as excellent candidates to detect ionizing radiation, mainly including direct detection and indirect devices with an additional scintillation process. Compared with visible photons, ionizing radiations have higher energy and long penetration depth, and require much thicker absorbing layers, i.e. a few hundreds of micrometers. Hence, we have to fabricate thick junction devices to effectively absorb X-ray or g-ray. On the other hand, charge transport and recombination losses are another issue for direct detection of ionizing radiations, limited by the moderate mobility-lifetime product. In this talk, I mainly introduce three strategies to prepare thick-junctions, which are based on perovskite /polymer composite films, perovksite single crystals and co-evaporated perovskite thick films. The balance between absorption and charge transport will be discussed, which is also correlated with the device performance, e.g., dark and noise current, photogeneration, response time and linear dynamic range.
The financially supports from the National Natural Science Foundation of China (Grant No. 61875154), Science and Technology Department of Hubei Province (Grant No. 2018CFA021, No. 2019AAA020) are gratefully acknowledged.
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