太赫兹光谱技术在表征双相无机钙钛矿材料特性中的应用  

Application of Terahertz Spectroscopy Technology in Characterization of the Properties of Dual-Phase Inorganic Perovskite Materials

作　　者：常青[1] 程士嘉 侯文鑫 王引书[3] Chang Qing;Cheng Shijia;Hou Wenxin;Wang Yinshu(Experimental Teaching Platform,Academic Affairs Department,Beijing Normal University at Zhuhai,Zhuhai 519087,China;College of Education for the Future,Beijing Normal University at Zhuhai,Zhuhai 519087,China;Faculty of Arts and Sciences,Beijing Normal University at Zhuhai,Zhuhai 519087,China;School of Electrical and Electronic Engineering,Nanyang Technological University,Singapore 639798,Singapore)

机构地区：[1]北京师范大学珠海校区教务部实验教学平台,广东珠海519087 [2]北京师范大学珠海校区未来教育学院,广东珠海519087 [3]北京师范大学珠海校区文理学院,广东珠海519087 [4]南洋理工大学电子电气工程学院,新加坡639798

出　　处：《半导体技术》2024年第7期682-688,共7页Semiconductor Technology

摘　　要：钙钛矿材料制备过程中的成分监控与表征对材料科学与钙钛矿技术的发展至关重要。采用时间分辨太赫兹光谱(TRTS)技术对双相CsPbBr3-CsPb2Br5薄膜材料在光泵浦作用下的光致电导特性进行了详细分析。通过观察和区分不同成分的Cs-Pb-Br三元钙钛矿材料的光谱特征,确认了不同声子模式的来源。使用Drude-Smith模型的延伸模型对样品的光致电导进行拟合分析,进一步探究了薄膜材料的载流子动力学过程以及晶体结构的变化过程。本实验为太赫兹时域光谱技术在钙钛矿鉴别中的应用提供了新的视角,也为钙钛矿材料在光伏领域的潜在应用提供了坚实的理论依据。Composition monitoring and characterization during the preparation of perovskite materials are crucial for the development of materials science and perovskite technology.The photoconductive properties of dual-phase CsPbBr,-CsPb,Br,thin film materials under optical pumping were analyzed in detail by using time-resolved terahertz spectroscopy(TRTS)technology.By observing and distinguishing the spectral characteristics of different compositions of Cs-Pb-Br ternary perovskite materials,the sources of different phonon modes were confirmed.The photoconductivity of the samples was analyzed by fitting with an extended model of the Drude-Smith model.The carrier dynamics process and the changes process of crystal structure of the thin film materials were further explored.This experiment provides a new perspective for the application of terahertz time-domain spectroscopy technology in the identification of perovskites and offers a solid theoretical basis for the potential application of perovskite materials in the field of photovoltaics.

关 键 词：钙钛矿 时间分辨太赫兹光谱(TRTS) 载流子动力学 光学声子 光伏特性 

分 类 号：TN304.07[电子电信—物理电子学] TN304.2