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Open AccessArticle

Enhanced Photoresponsivity of All-Inorganic (CsPbBr3) Perovskite Nanosheets Photodetector with Carbon Nanodots (CDs)

1
Nanobio Device Laboratory, School of Electrical and Electronic Engineering, Yonsei University, Seoul 120-749, Korea
2
Inter-university Semiconductor Research Center (ISRC) and the Department of Electrical and Computer Engineering, Seoul National University, Seoul 151-744, Korea
3
Biomaterials Laboratory, Department of Chemical and Biomolecular Engineering, Yonsei University, Seoul 120-749, Korea
*
Author to whom correspondence should be addressed.
Electronics 2019, 8(6), 678; https://doi.org/10.3390/electronics8060678
Received: 23 May 2019 / Revised: 12 June 2019 / Accepted: 13 June 2019 / Published: 14 June 2019
(This article belongs to the Special Issue Advanced Technologies in Nanoelectronics)
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. View Full-Text
Keywords: all-inorganic perovskite; CsPbBr3; carbon nanodots; charge transfer; carrier separation; photodetectors all-inorganic perovskite; CsPbBr3; carbon nanodots; charge transfer; carrier separation; photodetectors
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MDPI and ACS Style

Algadi, H.; Mahata, C.; Woo, J.; Lee, M.; Kim, M.; Lee, T. Enhanced Photoresponsivity of All-Inorganic (CsPbBr3) Perovskite Nanosheets Photodetector with Carbon Nanodots (CDs). Electronics 2019, 8, 678.

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