高质量钙钛矿纳米线的气相离子交换及其光电性能  

Gas Phase Ion Exchange and Optoelectronic Properties of High-Quality Perovskite Nanowires

作　　者：吴苏桓 李静[1] 杨一鸣 Wu Suhuan;Li Jing;Yang Yiming(School of Integrated Circuits,Dalian University of Technology,Dalian 116600,China)

机构地区：[1]大连理工大学集成电路学院,辽宁大连116600

出　　处：《微纳电子技术》2024年第11期62-70,共9页Micronanoelectronic Technology

基　　金：中国博士后科学基金(2023M730479)。

摘　　要：金属卤化物钙钛矿材料具有较高的柔韧性和离子迁移能力,可通过离子交换的方法实现化学组分和光学性能调控。室温溶液法虽然可以制备高质量且较高稳定性的δ-CsPbI_(3)纳米线,但其光电性能较差。利用快速低压气相离子交换的方法,通过改变反应条件,将非钙钛矿相的δ-CsPbI_(3)单晶纳米线转化为具有钙钛矿相晶体结构的混合钙钛矿纳米线(CsPbI_(3-n)Br_(n)(0<n<3)),制得的钙钛矿相CsPbI_(3-n)Br_(n)纳米线不仅保持良好的表面形貌,还具有较强的光致荧光发射特征,并可通过调节交换条件来调控混合钙钛矿纳米线中Br^(-)/I^(-)的浓度比以实现纳米线对不同光谱的吸收与发射。此外,还制备了基于混合钙钛矿CsPbI_(3-n)Br_(n)纳米线的光电探测器,探究了交换程度对光电性能的影响。通过电学测试发现,在3 V偏压、405 nm波长紫外光照射下,该器件的开关比约为1.8×10^(2),响应率最高约为2.26 mA·W^(-1),探测率最大约为1.55×10^(11) Jones。未来,通过优化金属卤化物钙钛矿的离子交换方法,可更精准地调控其化学组成和光学性能,从而增强其在光电探测领域中的应用。Metal halide perovskite materials have high flexibility and ion migration ability,and can be controlled for chemical composition and optical properties through ion exchange methods.High-quality and highly stableδ-CsPbI_(3) nanowires can be prepared by the room temperature solution method,but their photoelectric performance is poor.Theδ-CsPbI_(3) single crystal nanowires with non-perovskite phase were transformed into mixed perovskite nanowires with a perovskite phase crystal structure(CsPbI_(3-n)Br_(n)(0<n<3))by rapid low-pressure gas-phase ion exchange method and changing the reaction conditions.The prepared CsPbI_(3-n)Br_(n) nanowires with perovskite phase not only maintain good surface morphology,but also exhibit strong photoluminescence emission characteristics.The concentration rate of Br^(-)/I^(-) in the mixed perovskite nanowires can be adjusted by adjusting the exchange conditions to achieve absorption and emission of the nanowires to different spectra.In addition,a photodetector based on mixed perovskite CsPbI_(3-n)Br_(n) nanowires was prepared and the effect of exchange degree on optoelectronic performance was investigated.Through electrical testing,it is found that the switching ratio of the device is about 1.8×10^(2),the highest response rate is about 2.26 mA·W^(-1) and the maximum detection rate is about 1.55×10^(11) Jones under 3 V bias and 405 nm wavelength ultraviolet light irradiation.In the future,the chemical composition and optical properties of metal halide perovskite can be more accurately regulated by optimizing the ion exchange method of metal halide perovskite,so as to enhance its application in the field of optoelectronic detection.

关 键 词：卤化物钙钛矿 纳米线 CsPbI3 离子交换 光电探测器 

分 类 号：TN15[电子电信—物理电子学]