文献类型：期刊文献

英文题名：Effect of sandwiched YbCl3 layer thickness on exciton dynamics of Yb3+ doped CsPbCl3 perovskite photodetectors

作者：Mu, Haichuan[1];Guo, Qi[1];Wang, Ruibin[2];Qian, Min[1];Tang, Jingjian[1]

机构：[1]East China Univ Sci & Technol, Sch Phys, 130 Meilong Rd, Shanghai 200237, Peoples R China;[2]Shanghai Jiao Tong Univ, Instrumental Anal Ctr, 800 Dongchuan Rd, Shanghai 200240, Peoples R China

年份：2024

卷号：35

期号：2

外文期刊名：NANOTECHNOLOGY

收录：;EI(收录号：20234615056367);WOS:【SCI-EXPANDED(收录号:WOS:001093800300001)】；

基金：The author thanks Juan Liu, Research Center of Analysis and Test of East China University of Science and Technology, for the support on the SEM analysis and Limin Sun, Xue Ding, and Nannan Zhang in The Instrumental Analysis Center of Shanghai Jiao Tong University for the discussion about the XPS data reduction. The study is supported by National Natural Science Foundation of China (NSFC11974366).

语种：英文

外文关键词：perovskite; wide spectrum; photodetector; Yb3+ upconversion; electronic structure

摘要：Yb3+ doped CsPbCl3 metal halide perovskite photodetectors (PDs) in the structure of CsPbCl3(50 nm)/YbCl3(x nm)/CsPbCl3(50 nm), in which x ranges from 10 to 40 nm corresponding to the molar ratio from 6.3% to 25.2%, are fabricated by thermal evaporation on Si/SiO2 substrate. Photoresponse from 350 to 980 nm have been achieved with the optimal responsivity (R) of 3959, 5425, 955 A W-1 for the case of 20 nm YbCl3 at the wavelength (lambda) of 420, 680 and 980 nm, respectively. A series of photophysical and electrical characterization has been performed and it is found that the remarkably improved photoresponse originates from the combining effects of upconversion and defects passivation from Yb3+. Moreover, the optimal YbCl3 thickness of 20 nm can be ascribed to the balance between upconversion and concentration quenching of Yb3+. The influence of the YbCl3 doping on the CsPbCl3 electronic structure is investigated and downshifting and stabilization of valence band maximum (VBM) can be attributed to the p-type doping and counteracting effect of Yb3+ and Cl-, respectively.