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Issue 35, 2016
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Schottky junctions on perovskite single crystals: light-modulated dielectric constant and self-biased photodetection

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Abstract

Schottky junctions formed between semiconductors and metal contacts are ubiquitous in modern electronic and optoelectronic devices. Here we report on the physical properties of Schottky-junctions formed on hybrid perovskite CH3NH3PbBr3 single crystals. It is found that light illumination can significantly increase the dielectric constant of perovskite junctions by 2300%. Furthermore, such Pt/perovskite junctions are used to fabricate self-biased photodetectors. A photodetectivity of 1.4 × 1010 Jones is obtained at zero bias, which increases to 7.1 × 1011 Jones at a bias of +3 V, and the photodetectivity remains almost constant in a wide range of light intensity. These devices also exhibit fast responses with a rising time of 70 μs and a falling time of 150 μs. As a result of the high crystal quality and low defect density, such single-crystal photodetectors show stable performance after storage in air for over 45 days. Our results suggest that hybrid perovskite single crystals provide a new platform to develop promising optoelectronic applications.

Graphical abstract: Schottky junctions on perovskite single crystals: light-modulated dielectric constant and self-biased photodetection

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Publication details

The article was received on 06 Jul 2016, accepted on 16 Aug 2016 and first published on 16 Aug 2016


Article type: Paper
DOI: 10.1039/C6TC02828D
Citation: J. Mater. Chem. C, 2016,4, 8304-8312
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    Schottky junctions on perovskite single crystals: light-modulated dielectric constant and self-biased photodetection

    P. A. Shaikh, D. Shi, J. R. D. Retamal, A. D. Sheikh, Md. A. Haque, C. Kang, J. He, O. M. Bakr and T. Wu, J. Mater. Chem. C, 2016, 4, 8304
    DOI: 10.1039/C6TC02828D

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