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

Electronics

Minsu Kim¹  Chandreswar Mahata²  Janghoon Woo³  Hassan Algadi³  Minkyu Lee³  Taeyoon Lee³ 

[1] Biomaterials Laboratory, Department of Chemical and Biomolecular Engineering, Yonsei University, Seoul 120-749, Korea;Inter-university Semiconductor Research Center (ISRC) and the Department of Electrical and Computer Engineering, Seoul National University, Seoul 151-744, Korea;Nanobio Device Laboratory, School of Electrical and Electronic Engineering, Yonsei University, Seoul 120-749, Korea;

关键词: all-inorganic perovskite;    CsPbBr₃;    carbon nanodots;    charge transfer;    carrier separation;    photodetectors;   

DOI  :  10.3390/electronics8060678

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown