Perovskite heterojunction based on CH3NH3PbBr3 single crystal for high-sensitive self-powered photodetector

Min Cao, Jiyu Tian, Zhi Cai, Lan Peng, Lei Yang, Dacheng Wei

Research output: Contribution to journalArticlepeer-review

60 Citations (Scopus)

Abstract

Perovskite single crystals exhibit extraordinary optoelectronic performances due to their advantages such as low trap-state densities, long carrier diffusion, and large absorption coefficient, and thus, photodetectors based on perovskite single crystals have attracted much research interest. Unlike the reported one-component single-crystal perovskite photodetectors, here, we have developed a facile two-step approach to fabricate a core-shell heterojunction based on the CH3NH3PbBr3 single crystal. A photodetector made of the as-prepared perovskite heterojunction renders the feature of self-power attributed to a built-in electric field in the junction and exhibits a wavelength-dependent responsivity with a peak responsivity up to 11.5 mA W−1 under 450 nm irradiation at zero bias, which is one order of magnitude higher than the CH3NH3PbBr3 single crystal and shows a maximum external quantum efficiency of 3.17%, also higher than the reported 0.2% of the CH3NH3PbBr3 single crystal. Our work may lead to more efficient self-powered heterojunction systems based on perovskite single crystals.
Original languageEnglish
Article number233303
Number of pages4
JournalApplied Physics Letters
Volume109
Issue number23
DOIs
Publication statusPublished - 6 Dec 2016

Keywords

  • Perovskite
  • Photodetector
  • Heterojunction
  • single crystal

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