脉冲激光用于钙钛矿CsPbBr_(3)半导体中载流子输运性能表征  

Determining the Carrier Mobility-Lifetime Product in the Perovskite CsPbBr3 Semiconductor with a Pulsed Laser

作　　者：汪俞权 任若菡 申南南 肖宝 何旭昌 孙啟皓 何亦辉 WANG Yu-quan;REN Ruo-han;SHEN Nan-nan;XIAO Bao;HE Xu-chang;SUN Qi-hao;HE Yi-hui(State Key Laboratory of Radiation Medicine and Protection,School for Radiological and Interdisciplinary Sciences(RAD-X),Soochow University,Suzhou 215123,China)

机构地区：[1]苏州大学放射医学及交叉学科研究院,放射医学与辐射防护国家重点实验室,江苏苏州215123

出　　处：《分析测试学报》2024年第10期1645-1650,1657,共7页Journal of Instrumental Analysis

基　　金：国家重点研发计划(2021YFF0502600);国家自然科学基金资助项目(U2267211);江苏省自然科学青年基金(BK20210711);苏州市创新创业领军人才计划项目(ZXL2022455)。

摘　　要：钙钛矿半导体具有优异的光电性能,被认为是新一代室温核辐射探测半导体。准确测定其载流子输运性能对于获得高性能钙钛矿半导体核辐射探测器至关重要。该文发展了以脉冲激光为激发源的钙钛矿半导体载流子输运性能表征方法。基于所制备的Au/CsPbBr_(3)/Bi器件,将脉冲激光由阳极面入射,并采集探测器阴极的脉冲信号,通过不同偏压下脉冲信号的上升时间及幅值分布,拟合得到CsPbBr_(3)半导体中空穴载流子的迁移率μh为11.78 cm^(2)·V^(-1)·s^(-1),迁移率寿命积μτh为2.82×10^(-3)cm^(2)·V^(-1),与传统以241Amα粒子为激发源的表征结果相当。该工作证明了以脉冲激光为激发源表征钙钛矿半导体的输运性能的可行性。基于CsPbBr_(3)半导体较好的载流子输运性能,该探测器表现出良好的γ射线探测性能,对57Co@122 keVγ射线的能量分辨率为8.5%。Perovskite semiconductors,renowned for their excellent optoelectronic properties,are regarded as promising candidates for next-generation room temperature nuclear radiation detectors.Accurately determining the charge carrier transport properties is crucial for developing high-perfor⁃mance perovskite semiconductor radiation detectors.In this work,we developed a characterization method for the carrier transport properties of perovskite semiconductors using a pulsed laser as the ex⁃citation source.Based on the fabricated Au/CsPbBr3/Bi device,the pulsed laser was incident from the anode side,and the pulse signals at the cathode of the detector were collected.By fitting the rise time and amplitude distribution of the pulse signals under different biases,the hole carrier mobility(μh)in the CsPbBr_(3)semiconductor was determined to be 11.78 cm^(2)·V^(-1)·s^(-1),and the mobility-life⁃time product(μτh)was 2.82×10-3 cm^(2)·V^(-1),comparable to those obtained using the traditional 241Amα-particle as excitation source.This work demonstrates the feasibility of characterizing the transport properties of perovskite semiconductors using a pulsed laser as excitation source.Due to the good car⁃rier transport properties,the detector exhibited excellentγ-ray detection performance,with an ener⁃gy resolution of 8.5%for 57Co 122 keVγ-rays.

关 键 词：钙钛矿半导体 半导体探测器 铯铅溴半导体 载流子迁移率寿命积 迁移率 

分 类 号：O649.3[理学—物理化学] P578.4[理学—化学]