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.
Highlights
Among the organolead halide perovskites, all-inorganic lead halide perovskites CsPbX3 (X = I, Br, Cl) are recognized for their high stability in humid environments, high absorption coefficient (2 × 105 cm−1 ) [16], and large carrier mobility (1000 cm2 V−1 S−1 ) [17]. With these outstanding electrical and optical properties, photodetectors based on all-inorganic lead halide perovskites should strongly outperform devices based on organic–inorganic halide perovskites or
A hybrid phototransistor based on graphene–CsPbBr3−x Ix perovskite nanocrystals achieved a high photo-responsivity of 108 A W−1 and a detectivity of 1016 Jones under 405-nm illumination at 0.07 mW−2 [23]
We demonstrate the higher performance of the hybrid CsPbBr3 /carbon nanodots (CDs) composite photodetector than the CD-free perovskite-based photodetector
Summary
Organic–inorganic halide perovskites have shown high performance in photodetectors [1,2,3,4,5], owing to their outstanding electrical and optical properties, including tunable bandgap [6], strong optical absorption [7], long carrier diffusion length [8], large carrier mobilities [9], and low deep state defects [10] They can be fabricated by low-cost, low-temperature solution-processing techniques such as drop-casting [11], spray-coating [12], spin-coating [13], and doctor-blading [14]. We demonstrate the higher performance of the hybrid CsPbBr3 /CD composite photodetector (with an on/off ratio of 102 and a responsivity of 608 mAW−1 ) than the CD-free perovskite-based photodetector (with a responsivity of 221 mAW−1 )
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