Schottky junctions on perovskite single crystals : Light-modulated dielectric constant and self-biased photodetection

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

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Author(s)

  • Parvez A. Shaikh
  • Dong Shi
  • Jose Ramon Duran Retamal
  • Arif D. Sheikh
  • Md. Azimul Haque
  • Chen-Fang Kang
  • Osman M. Bakr
  • Tom Wu

Detail(s)

Original languageEnglish
Pages (from-to)8304-8312
Journal / PublicationJournal of Materials Chemistry C
Volume4
Issue number35
Online published16 Aug 2016
Publication statusPublished - 21 Sep 2016
Externally publishedYes

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.

Citation Format(s)

Schottky junctions on perovskite single crystals : Light-modulated dielectric constant and self-biased photodetection. / Shaikh, Parvez A.; Shi, Dong; Retamal, Jose Ramon Duran; Sheikh, Arif D.; Haque, Md. Azimul; Kang, Chen-Fang; He, Jr-Hau; Bakr, Osman M.; Wu, Tom.

In: Journal of Materials Chemistry C, Vol. 4, No. 35, 21.09.2016, p. 8304-8312.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal