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

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 (...

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Bibliographic Details
Published in:Electronics (Basel) 2019-06, Vol.8 (6), p.678
Main Authors: Algadi, Hassan, Mahata, Chandreswar, Woo, Janghoon, Lee, Minkyu, Kim, Minsu, Lee, Taeyoon
Format: Article
Language:English
Subjects:
Bromine
Carbon
Cesium
Diodes
Efficiency
Electrodes
Grain boundaries
Graphene
Hybrid composites
Lasers
Microscopy
Nanosheets
Optical properties
Perovskites
Photometers
Quantum dots
Response time
Semiconductor lasers
Spin coating
Substrates
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Summary: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.
ISSN:2079-9292
2079-9292
DOI:10.3390/electronics8060678