Perovskite–Gold Nanorod Hybrid Photodetector with High Responsivity and Low Driving Voltage

Huan Wang, Ju Won Lim, Li Na Quan, Kyungwha Chung, Yu Jin Jang, Yuguang Ma, Dong Ha Kim

Research output: Contribution to journalArticlepeer-review

31 Scopus citations

Abstract

The optical and electronic properties of noble metallic nanoparticles can be exploited to enhance the performance of inorganic/organic photodetectors. In this work, a uniformly distributed layer of Au nanorods (AuNRs) is integrated into vertically structured perovskite photoconductive photodetectors and, as a result, perovskite–AuNR hybrid photodetectors that exhibit significant photocurrent enhancements are reported. Ultimately it achieves a responsivity of ≈320 A W−1 at a low driving voltage of −1 V. This is an improvement of 60% compared to the responsivity of pristine devices (≈200 A W−1). The high responsivity and low driving voltage place this device among the highest performing perovskite-based thin-film photoconductive photodetectors reported. The stability and linearity of the photoresponse following repeated light/dark cycles are characterized. The hybrid device also shows a fast response (with the decay time of ≈95 ns) compared to pristine devices (≈230 ns). The improvements in photodetection performance are attributed to plasmon-enhanced optical absorption, as well as advances in charge extraction and transport.

Original languageEnglish
Article number1701397
JournalAdvanced Optical Materials
Volume6
Issue number13
DOIs
StatePublished - 4 Jul 2018

Keywords

  • high responsivity
  • low driving voltage
  • perovskite–gold nanorod hybrid
  • vertically structured photoconductive photodetectors

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