Schottky Barrier-Controlled Black Phosphorus/Perovskite Phototransistors with Ultrahigh Sensitivity and Fast Response

Xuming Zou, Yuanzhe Li, Guanqi Tang, Peng You, Feng Yan

Research output: Journal article publicationJournal articleAcademic researchpeer-review

13 Citations (Scopus)

Abstract

Phototransistors are recognized as highly sensitive photodetectors owing to their high gain induced by a photogating effect. However, the response speed of a typical phototransistor is rather slow due to the long lifetime of trapped carriers in the channel. Here, a novel Schottky barrier-controlled phototransistor that shows ultrahigh sensitivity as well as a fast response speed is reported. The device is based on a channel of few-layer black phosphorous modified with a MAPbI3−xClx perovskite layer, whose channel current is limited by the Schottky barrier at the source electrode. The photoresponse speed of the device can be tuned by changing the drain voltage, which is attributed to a field-assisted detrapping process of electrons in the perovskite layer close to the Schottky barrier. Under optimal conditions, the device exhibits a high responsivity of 106–108 A W−1, an ultrahigh specific detectivity up to 9 × 1013 Jones, and a response time of ≈10 ms.

Original languageEnglish
Article number1901004
JournalSmall
Volume15
Issue number25
DOIs
Publication statusPublished - 21 Jun 2019

Keywords

  • black phosphorus
  • fast response
  • perovskites
  • phototransistors
  • ultrahigh sensitivity

ASJC Scopus subject areas

  • Biotechnology
  • Biomaterials
  • Chemistry(all)
  • Materials Science(all)

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