多晶Sb_(2)Se_(3)薄膜的载流子扩散复合研究  

Study on Carrier Diffusion and Recombination of Polycrystalline Sb_(2)Se_(3) Thin Films

作　　者：周青山 冯博浩 舒京婷 任佳欢 王宗成[2] 党伟[1] Zhou Qingshan;Feng Bohao;Shu Jingting;Ren Jiahuan;Wang Zongcheng;Dang Wei(College of Physcis Science and Technology,Hebei University,Baoding 071002,China;The 13th Research Institute,CETC,Shijiazhuang 050051,China)

机构地区：[1]河北大学物理科学与技术学院,河北保定071002 [2]中国电子科技集团公司第十三研究所,石家庄050051

出　　处：《微纳电子技术》2024年第10期73-80,共8页Micronanoelectronic Technology

基　　金：国家自然科学基金(22303023);河北省光电信息材料重点实验室后补助绩效经费(22567634H)。

摘　　要：研究Sb_(2)Se_(3)中的载流子复合和扩散对提高其光电性能至关重要。瞬态吸收光谱技术可以深入地描述材料载流子的复合、转移瞬态行为,这有助于理解材料的光物理特性,表征光电材料或器件的性能。测试不同激发波长和激发密度下的多晶Sb_(2)Se_(3)薄膜的瞬态吸收光谱。首先分析了瞬态吸收光谱的主要特征,然后提取了自由载流子复合动力学曲线,利用载流子的扩散复合方程对自由载流子的动力学曲线进行拟合。研究得到载流子双极性扩散系数D为1.80×10^(-6)m^(2)/s,载流子表面复合速率S为1400m/s,一阶载流子复合系数k1为2.50×10^(10)~4.50×10^(10)s^(-1),三阶俄歇复合系数k3为1.50×10^(-40)~8.00×10^(-40)m^(6)/s。研究结果有助于加深对Sb_(2)Se_(3)薄膜载流子复合的理解。The study of carrier recombination and diffusion in Sb_(2)Se_(3) is very important to improve its optoelectronic performance.Transient absorption spectroscopy technique can describe the transient behavior of carrier recombination and transfer,which is helpful to understand the photo physical properties of materials and characterize the performances of photoelectric materials or devices.The transient absorption spectra of polycrystalline Sb_(2)Se_(3) thin films under different excitation wavelengths and densities were measured.Firstly,the main characteristics of the transient absorption spectra were analyzed,and then the free carrier recombination kinetics curves were extracted.The carrier diffusion recombination equation was used to fit the free carrier dynamics curve.The results show that the carrier bipolar diffusion coefficient D is 1.80×10^(-6) m^(2)/s,the carrier surface recombination rate S is 1400 m/s,the first-order carrier recombination coefficient k1 is 2.50×10^(10)-4.50×10^(10) s^(-1),and the third-order Auger recombination coefficient k3 is 1.50×10^(-40)-8.00×10^(-40) m^(6)/s.The results are helpful to deepen the understanding of carrier recombination of Sb_(2)Se_(3) thin films.

关 键 词：Sb_(2)Se_(3) 瞬态吸收光谱 自由载流子 扩散 表面复合 

分 类 号：O472.3[理学—半导体物理]