钙钛矿量子点材料中极化子光吸收效应  

Polaron optical absorption effect in perovskite quantum dot materials

作　　者：冯爽 马皓楠 白静 马新军[1] 孙勇[1] FENG Shuang;MA Haonan;BAI Jing;MA Xinjun;SUN Yong(College of Physics and Electronic Information,Inner Mongolia University for Nationalities,Tongliao 028000,China)

机构地区：[1]内蒙古民族大学物理与电子信息学院,通辽028000

出　　处：《物理学报》2025年第9期302-310,共9页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:12164032);内蒙古自治区自然科学基金(批准号:2022MS01014);内蒙古民族大学博士科研启动基金(批准号:BS625);内蒙古民族大学博士科研启动基金(批准号:BS531);内蒙古自治区直属高校基本科研业务费(批准号:GXKY23Z029,GXKY23Z030)资助的课题.

摘　　要：钙钛矿量子点作为一种新兴的纳米材料,在光电转换领域展现出巨大的应用潜力,其中极化子在光谱特性和光电性能方面发挥着关键作用.本文通过幺正变换和Larsen方法,建立了极化子光吸收模型,揭示了钙钛矿量子点中极化子跃迁光吸收随电子-声子耦合常数和有效质量的变化规律.这一结果阐明了极化子光吸收的物理机制,为钙钛矿量子点材料性能的优化提供了新的思路和方法,同时拓展了其在光电探测器、发光二极管以及太阳能电池等领域的应用前景.Perovskite quantum dots,as an emerging class of nanomaterial,have demonstrated significant potential applications in the field of optoelectronic energy conversion due to their unique optoelectronic properties.In particular,polarons play a crucial role in the optical and optoelectronic performance of perovskite quantum dots.Polaron formation,which involves the coupling of electrons with lattice phonons,can induce charge shielding effect and localization effect,thereby protecting charge carriers from scattering and recombining.This leads to longer carrier lifetimes and diffusion lengths,thereby enhancing the efficiency of optoelectronic energy conversion.In this study,a polaronic light absorption model is established using unitary transformation and the Larsen method,revealing the dependence of polaronic transition optical absorption on the electron-phonon coupling constant and effective mass in perovskite quantum dots.The results indicate that the vibration frequency,excited-state energy of polarons,and the transition spectral line frequency are closely related to the electron-phonon coupling strength and effective mass.Specifically,as the electron-phonon coupling constant increases,the vibration frequency and excited-state energy of polarons decrease,while the transition spectral line frequency increases.This finding not only elucidates the physical mechanism of polaronic optical absorption but also provides new insights and methods for optimizing the performance of perovskite quantum dot materials.Moreover,this research expands the application scope of perovskite quantum dots in fields such as photodetectors,light-emitting diodes(LEDs),and solar cells.For instance,in LEDs,the high photoluminescence quantum yield and tunable bandgap of perovskite quantum dots make them ideal luminescent materials.In solar cells,their excellent optoelectronic conversion efficiency and carrier transport properties can significantly enhance device performance.By further optimizing polaron-related characteristics,it is expected that

关 键 词：钙钛矿量子点 光电器件 极化子 光吸收 

分 类 号：O469[理学—凝聚态物理]