Optoelectronic Properties of Mixed Sn/Pb Perovskite Solar Cells: The Study of Compressive Strain by Raman Modes

被引:25
|
作者
Badrooj, Mohammad [1 ]
Jamali-Sheini, Farid [3 ]
Torabi, Naeimeh [1 ,2 ]
机构
[1] Islamic Azad Univ, Dept Phys, Ahvaz Branch, Ahvaz 6134937333, Iran
[2] Yazd Univ, Engn Res Ctr, Photon Res Grp, Yazd 89195741, Iran
[3] Islamic Azad Univ, Adv Surface Engn & Nano Mat Res Ctr, Dept Phys, Ahvaz Branch, Ahvaz 6134937333, Iran
来源
JOURNAL OF PHYSICAL CHEMISTRY C | 2020年 / 124卷 / 49期
关键词
FORMAMIDINIUM TIN IODIDE; CHARGE-LIMITED CURRENTS; OPTICAL-PROPERTIES; PHASE-TRANSITIONS; CARRIER DYNAMICS; TRAP DENSITY; CH3NH3PBI3; SN; EFFICIENCY; STABILITY;
D O I
10.1021/acs.jpcc.0c07999
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Mixed Sn/Pb perovskite solar cells offer a suitable alternative pathway to reduce lead toxicity and regulate optical band gap and therefore have significant potential for the development of clean and renewable energy technologies. In this study, the optical and electrical properties of CH3NH3SnxPb1-xI3 [0 <= x <= 1] solar cells under dark conditions were investigated. The compressive strain values of perovskite layers were measured and reported by analyzing the shift of their active Raman modes. Electrical characterizations under dark conditions showed that the values of the threshold voltage (V-th) and inverse saturation current (I-0) of the cells decrease and increase with increasing Sn concentration, respectively. Examination of the behavior of the space charge limited current (SCLC) of cells showed that the presence of Sn atoms increases the ability of the electrical carrier mobility (mu) of cells. Based on the results and calculations, the charge transport mechanism indices including the ideality factor (n), trap-filled limit voltage (V-TFL), trap-state density (n(trap)), and the lifetime of minor carriers (tau(n)) in each of the samples were characterized and reported.
引用
收藏
页码:27136 / 27147
页数:12
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