Implications of Electron Transport Layer and Back Metal Contact Variations in Tin-Lead Perovskite Solar Cells Assessed by Spectroscopic Ellipsometry and External Quantum Efficiency

被引：5

作者：

Bordovalos, Alexander ^{[1
]}

Subedi, Biwas ^{[1
]}

Chen, Lei ^{[1
]}

Song, Zhaoning ^{[1
]}

Yan, Yanfa ^{[1
]}

Podraza, Nikolas J. ^{[1
]}

机构：

[1] Univ Toledo, Wright Ctr Photovolta Innovat & Commercializat, Dept Phys & Astron, Toledo, OH 43606 USA

来源：

ACS APPLIED MATERIALS & INTERFACES | 2023年 / 15卷 / 15期

基金：

美国国家科学基金会;

关键词：

perovskite solar cells; optical and electronic losses; external quantum efficiency modeling; optical properties; interfacial layers; spectroscopic ellipsometry; THERMAL-STABILITY; FILMS; ABSORPTION; DIFFUSION;

D O I：

10.1021/acsami.3c01849

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The structural and optical properties of hybrid organic???inorganic metal halide perovskite solar cells are measured by spectroscopic ellipsometry to reveal an optically distinct interfacial layer among the back contact metal, charge transport, and absorber layers. Understanding how this interfacial layer impacts performance is essential for developing higher performing solar cells. This interfacial layer is modeled by Bruggeman effective medium approximations (EMAs) to contain perovskite, C60, BCP, and metal. External quantum efficiency (EQE) simulations that consider scattering, electronic losses, and the formation of nonparallel interfaces are created with input derived from ellipsometry structural-optical models and compared with experimental EQE to estimate optical losses. This nonplanar interface causes optical losses in short circuit current density (JSC) of up to 1.2 mA cm???2. A study of glass/C60/ SnO2/Ag or Cu and glass/C60/BCP/Ag film stacks shows that C60 and BCP mix, but replacing BCP with SnO2 can prevent mixing between the ETLs to prevent contact between C60 and back contact metal and enable the formation of a planar interface between ETLs and back contact metals.

引用

页码：19730 / 19740

页数：11

共 54 条

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