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Issue 4, 2019
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Inorganic CsBi3I10 perovskite/silicon heterojunctions for sensitive, self-driven and air-stable NIR photodetectors

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Abstract

In this study, a sensitive near-infrared (NIR) photodetector based on a CsBi3I10 perovskite/Si heterojunction is developed by directly coating a layer of inorganic perovskite onto a planar Si substrate. The as-constructed heterojunction displays a representative current rectifying behavior in the dark and remarkable photoresponse properties upon light irradiation. The distinct photovoltaic effect enables the device to function as a self-driven photodetector working at zero bias. Furthermore, it is observed that the photodetector is sensitive in a wide spectral region with peak sensitivity at ∼820 nm. Under 808 nm illumination, the critical photoresponse parameters of responsivity, external quantum efficiency and specific detectivity reached 178.7 mA W−1, 27.2% and 4.99 × 1010 Jones at zero bias, respectively, which can be further increased to as high as 492.1 mA W−1, 75.2% and 1.38 × 1011 Jones at a working bias of −1 V. What is more, the present device also holds a large Ilight/Idark ratio of ∼1 × 104, a rapid response speed of 73/36 μs, and excellent air stability even after 3 months of storage under ambient conditions. Considering the good photoresponse performance and facile assembly approach, the CsBi3I10 perovskite/Si heterojunction possesses huge potential for future cost-effective and high-performance photodetection applications.

Graphical abstract: Inorganic CsBi3I10 perovskite/silicon heterojunctions for sensitive, self-driven and air-stable NIR photodetectors

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Publication details

The article was received on 16 Nov 2018, accepted on 08 Dec 2018 and first published on 11 Dec 2018


Article type: Paper
DOI: 10.1039/C8TC05765F
J. Mater. Chem. C, 2019,7, 863-870

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    Inorganic CsBi3I10 perovskite/silicon heterojunctions for sensitive, self-driven and air-stable NIR photodetectors

    X. Tong, Z. Zhang, D. Wang, L. Luo, C. Xie and Y. Wu, J. Mater. Chem. C, 2019, 7, 863
    DOI: 10.1039/C8TC05765F

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