Enhanced photoresponsivity of all-inorganic (Cspbbr3) perovskite nanosheets photodetector with carbon nanodots (CDs)

Hassan Algadi, Chandreswar Mahata, Janghoon Woo, Minkyu Lee, Minsu Kim, Taeyoon Lee

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Abstract

A hybrid composite photodetector based on cesium lead bromine perovskite (CsPbBr3) nanosheets and carbon nanodots (CDs) was fabricated on a quartz substrate by a one-step method of spin-coating and hot-plate annealing. The responsivity of the CsPbBr3/CD hybrid composite photodetector was 608 mAW−1 (under a 520-nm laser diode source applied at 0.2 mWcm−2), almost three times higher than that of a CsPbBr3-based photodetector (221 mAW−1). The enhanced performance of the CsPbBr3/CD photodetector is attributable to the high band alignment of the CDs and CsPbBr3, which significantly improves the charge extraction at the CsPbBr3/CD interface. Moreover, the hybrid CsPbBr3/CD photodetector exhibited a fast response time with a rise and decay time of 1.55 and 1.77 ms, which was faster than that of a pure CsPbBr3 based photodetector, indicating that the CDs accelerate the extraction of electrons and holes trapped in the CsPbBr3 film.

Original languageEnglish
Article number678
JournalElectronics (Switzerland)
Volume8
Issue number6
DOIs
Publication statusPublished - 2019 Jun

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All Science Journal Classification (ASJC) codes

  • Control and Systems Engineering
  • Signal Processing
  • Hardware and Architecture
  • Computer Networks and Communications
  • Electrical and Electronic Engineering

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