Cd-Free High-Bandgap Cu2ZnSnS4 Solar Cell with 10.7% Certified Efficiency Enabled by Engineering Sn-Related Defects

被引：3

作者：

Wang, Ao ^{[1
]}

Huang, Jialiang ^{[1
]}

Yan, Chang ^{[2
,3
]}

He, Guojun ^{[1
]}

Cui, Xin ^{[1
]}

Yuan, Xiaojie ^{[1
]}

Zhou, Shujie ^{[4
]}

He, Mingrui ^{[1
]}

Qiu, Tianyun ^{[1
]}

Zhao, Chenghan ^{[1
]}

Green, Martin A. ^{[1
]}

Sun, Kaiwen ^{[1
]}

Hao, Xiaojing ^{[1
]}

机构：

[1] Univ New South Wales, Australian Ctr Adv Photovolta, Sch Photovolta & Renewable Energy Engn, Sydney, NSW 2052, Australia

[2] Hong Kong Univ Sci & Technol Guangzhou, Sustainable Energy & Environm Thrust, Guangzhou 511400, Guangdong, Peoples R China

[3] Jiangmen Lab Carbon Sci & Technol, Guangdong Hong Kong Joint Lab Carbon Neutral, Jiangmen 529199, Guangdong, Peoples R China

[4] Univ New South Wales, Sch Chem Engn, Sydney, NSW 2052, Australia

来源：

ADVANCED FUNCTIONAL MATERIALS | 2024年 / 34卷 / 45期

基金：

澳大利亚研究理事会; 中国国家自然科学基金;

关键词：

Cd-free; CZTS; defects engineering; kesterite; KESTERITE; CZTS; NANOCOMPOSITE; PASSIVATION; TEMPERATURE; ORIGIN;

D O I：

10.1002/adfm.202407063

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Cd-free high-bandgap Cu2ZnSnS4 (CZTS) solar cells are expected to offer green and low-cost solutions to single-junction and tandem photovoltaic markets. Despite attracting considerable attention in past years, reported certified efficiency has yet to exceed the 10% threshold. Sn-related defects, especially those originating from Sn2+ oxidation states, lead to severe recombination loss and limit device performance. Here, the formation of these detrimental defects is suppressed by creating a more benign chemical environment during sulfurization annealing. With dominant Sn4+ states in the source material and the precursor, the oxidation state of Sn remains primarily in its native Sn4+ state during annealing and in the final film. Engineering the Sn-related defects leads to shallower tail states in bulk CZTS and fewer interfacial defects. As a result, both radiative and non-radiative recombination losses are alleviated, contributing to a certified 10.7% efficiency of the Cd-free high-bandgap CZTS solar cell. This strategy may advance various kesterite materials and other technologies with multivalent constituents.

引用

页数：8

共 55 条

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