Issue

Vol. 15 (2023)

One-Step Gas–Solid-Phase Diffusion-Induced Elemental Reaction for Bandgap-Tunable CuaAgm1Bim2In/CuI Thin Film Solar Cells

https://doi.org/10.1007/s40820-023-01033-5
Erchuang Fan
Key Laboratory of Micro‑Nano Materials for Energy Storage and Conversion of Henan Province, College of Chemical and Materials Engineering, Institute of Surface Micro and Nano Materials, Xuchang University, Xuchang 461000, People’s Republic of China
Manying Liu
Key Laboratory of Micro‑Nano Materials for Energy Storage and Conversion of Henan Province, College of Chemical and Materials Engineering, Institute of Surface Micro and Nano Materials, Xuchang University, Xuchang 461000, People’s Republic of China
Kangni Yang
Key Laboratory of Micro‑Nano Materials for Energy Storage and Conversion of Henan Province, College of Chemical and Materials Engineering, Institute of Surface Micro and Nano Materials, Xuchang University, Xuchang 461000, People’s Republic of China
Siyu Jiang
Key Laboratory of Micro‑Nano Materials for Energy Storage and Conversion of Henan Province, College of Chemical and Materials Engineering, Institute of Surface Micro and Nano Materials, Xuchang University, Xuchang 461000, People’s Republic of China
Bingxin Li
Key Laboratory of Micro‑Nano Materials for Energy Storage and Conversion of Henan Province, College of Chemical and Materials Engineering, Institute of Surface Micro and Nano Materials, Xuchang University, Xuchang 461000, People’s Republic of China
Dandan Zhao
Key Laboratory of Micro‑Nano Materials for Energy Storage and Conversion of Henan Province, College of Chemical and Materials Engineering, Institute of Surface Micro and Nano Materials, Xuchang University, Xuchang 461000, People’s Republic of China
Yanru Guo
Key Laboratory of Micro‑Nano Materials for Energy Storage and Conversion of Henan Province, College of Chemical and Materials Engineering, Institute of Surface Micro and Nano Materials, Xuchang University, Xuchang 461000, People’s Republic of China
Yange Zhang
Key Laboratory of Micro‑Nano Materials for Energy Storage and Conversion of Henan Province, College of Chemical and Materials Engineering, Institute of Surface Micro and Nano Materials, Xuchang University, Xuchang 461000, People’s Republic of China
Peng Zhang
School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, People’s Republic of China
Chuantian Zuo
Center for Excellence in Nanoscience (CAS), Key Laboratory of Nanosystem and Hierarchical Fabrication (CAS), National Center for Nanoscience and Technology, Beijing 100190, People’s Republic of China
Liming Ding
Center for Excellence in Nanoscience (CAS), Key Laboratory of Nanosystem and Hierarchical Fabrication (CAS), National Center for Nanoscience and Technology, Beijing 100190, People’s Republic of China
Zhi Zheng
Key Laboratory of Micro‑Nano Materials for Energy Storage and Conversion of Henan Province, College of Chemical and Materials Engineering, Institute of Surface Micro and Nano Materials, Xuchang University, Xuchang 461000, People’s Republic of China

Corresponding Author: Zhi Zheng

zzheng@xcu.edu.cn

Nano-Micro Letters, Vol. 15 (2023), Article Number: 58

Abstract

Lead-free inorganic copper-silver-bismuth-halide materials have attracted more and more attention due to their environmental friendliness, high element abundance, and low cost. Here, we developed a strategy of one-step gas–solid-phase diffusion-induced reaction to fabricate a series of bandgap-tunable CuaAgm1Bim2In/CuI bilayer films due to the atomic diffusion effect for the first time. By designing and regulating the sputtered Cu/Ag/Bi metal film thickness, the bandgap of CuaAgm1Bim2In could be reduced from 2.06 to 1.78 eV. Solar cells with the structure of FTO/TiO2/CuaAgm1Bim2In/CuI/carbon were constructed, yielding a champion power conversion efficiency of 2.76%, which is the highest reported for this class of materials owing to the bandgap reduction and the peculiar bilayer structure. The current work provides a practical path for developing the next generation of efficient, stable, and environmentally friendly photovoltaic materials.


Highlights:


1 The CuaAgm1Bim2In/CuI bilayer films are prepared simultaneously in situ by a one-step low-temperature gas-solid phase diffusion induced elemental reaction without spin coating.
2 A new type of CuaAgm1Bim2In photovoltaic material was originally designed to reduce the bandgap of this class of materials from 2.06 to 1.78 eV by breaking the restriction of double perovskite structure with a ratio of Ag:Bi = 1:1.
3 The power conversion efficiency (PCE) of solar cell with a structure of FTO/TiO2/CuaAgm1Bim2In/CuI/carbon reached 2.76%, which is the highest PCE for CuaAgm1Bim2In absorbers.

Keywords

CuaAgm1Bim2In Elemental reaction Bandgap tuning Solar cells Gas–solid phase
Fan, Erchuang, Manying Liu, Kangni Yang, Siyu Jiang, Bingxin Li, Dandan Zhao, Yanru Guo, Yange Zhang, Peng Zhang, Chuantian Zuo, Liming Ding, and Zhi Zheng. 2023. “One-Step Gas–Solid-Phase Diffusion-Induced Elemental Reaction for Bandgap-Tunable CuaAgm1Bim2In/CuI Thin Film Solar Cells”. Nano-Micro Letters 15 (March):58. https://doi.org/10.1007/s40820-023-01033-5.
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