PbS胶体量子点薄膜的光载流子辐射特性研究  

Photocarrier Radiometry Characteristics of PbS Colloidal Quantum Dot Films

作　　者：雒东辉 王谦 赵子涛 Luo Donghui;Wang Qian;Zhao Zitao(School of Optoelectronical Engineering,Xi’an Technological University,Xi’an 710021,Shaanxi,China)

机构地区：[1]西安工业大学光电工程学院,陕西西安710021

出　　处：《激光与光电子学进展》2024年第9期507-513,共7页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(61704132);陕西省自然科学基础研究项目(2020JQ-815);陕西高校青年创新团队。

摘　　要：胶体量子点材料在太阳能电池和光电探测器等光电器件中有着广泛的应用。利用光载流子辐射技术分析了PbS胶体量子点薄膜中含陷阱态时的激子输运状态。建立了不考虑量子点间净载流子传输的理论模型,针对载流子的复合特性对光载流子辐射信号的影响进行了仿真。最后通过激发功率相关的频率扫描光载流子辐射实验,并结合建立的激子输运模型,提取了有效激子寿命、载流子俘获率、退俘获寿命等参数,证实了理论模型的有效性。Colloidal quantum dot materials have pertinent applications in optoelectronic devices such as solar cells and photodetectors.Photocarrier radiometry technology is used to determine the exciton transport characteristics of a PbS colloidal quantum dot film containing trap states.A theoretical model ignoring net carrier transport between quantum dots is established,and the effects of exciton transport characteristics on photocarrier radiometry signals are subsequently simulated and analyzed.Finally,by conducting a frequency sweeping photocarrier radiometry experiment with different excitation powers,combined with the established exciton transport model,a variety of material parameters such as the effective exciton lifetime,carrier capture rate,and decapture lifetime are extracted.The experimental results confirm the validity of the proposed theoretical model.

关 键 词：量子点薄膜 载流子复合 陷阱态 光载流子辐射 

分 类 号：O436.2[机械工程—光学工程]