Tunable Optoelectronic Properties of CsPbBr3 Perovskite Nanocrystals for Photodetectors Applications

被引:7
|
作者
Suhail, Atif [1 ,2 ]
Saini, Ankush [1 ]
Beniwal, Shivang [1 ]
Bag, Monojit [1 ,2 ]
机构
[1] Indian Inst Technol Roorkee, Adv Res Electrochem Impedance Spect Lab, Roorkee 247667, India
[2] Indian Inst Technol, Ctr Nanotechnol, Roorkee 247667, India
来源
JOURNAL OF PHYSICAL CHEMISTRY C | 2023年 / 127卷 / 34期
关键词
QUANTUM DOTS; COLLOIDAL SYNTHESIS; SURFACE-CHEMISTRY; PHOTOLUMINESCENCE; ENHANCEMENT; STABILITY;
D O I
10.1021/acs.jpcc.3c04856
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Inorganic halide perovskite nanocrystals (NCs) have drawnconsiderableattention in recent years due to their improved stability, superiorphotophysical properties, and defect-tolerant nature, which allowsfor high carrier mobility and efficient charge transport in variousoptoelectronic devices. The bandgap and size of halide perovskitenanocrystals can be tuned through a variety of approaches, includingcation/anion exchange, ligand modification, and precursor concentrationadjustment. In this article, we investigate the effects of precursorconcentration on the structural, optical, and electronic propertiesof cesium lead bromide (CsPbBr3) nanocrystals. We havesynthesized & SIM;13-50 nm nanocrystals from four differentconcentrations of precursor solutions. It has been observed that theexcitonic absorption band increases with particle size as the precursorconcentration decreases. The steady state photoluminescence intensitydecreases due to a shorter carrier lifetime (in solution). We havefabricated photodetectors using four different-size samples and showthat the photoresponsivity increases with increasing particle size.The nanocrystals synthesized from the diluted precursor solution (0.005M) exhibits the highest detectivity of 2.84 x 10(9) jonesdue to their larger crystal size and fewer defect states, which resultsin a higher carrier diffusion length with reduced free carrier recombination.
引用
收藏
页码:17298 / 17306
页数:9
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