Cu2ZnSnS4 solar cells with over 10% power conversion efficiency enabled by heterojunction heat treatment

被引：488

作者：

Yan, Chang ^{[1
]}

Huang, Jialiang ^{[1
]}

Sun, Kaiwen ^{[1
]}

Johnston, Steve ^{[2
]}

Zhang, Yuanfang ^{[1
]}

Sun, Heng ^{[1
]}

Pu, Aobo ^{[1
]}

He, Mingrui ^{[1
]}

Liu, Fangyang ^{[1
]}

Eder, Katja ^{[3
]}

Yang, Limei ^{[3
]}

Cairney, Julie M. ^{[3
]}

Ekins-Daukes, N. J. ^{[1
]}

Hameiri, Ziv ^{[1
]}

Stride, John A. ^{[4
]}

Chen, Shiyou ^{[5
]}

Green, Martin A. ^{[1
]}

Hao, Xiaojing ^{[1
]}

机构：

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

[2] Natl Renewable Energy Lab, Golden, CO USA

[3] Univ Sydney, Australian Ctr Microscopy & Microanal, Sydney, NSW, Australia

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

[5] East China Normal Univ, Sch Informat Sci & Technol, Shanghai, Peoples R China

来源：

NATURE ENERGY | 2018年 / 3卷 / 09期

基金：

澳大利亚研究理事会;

关键词：

OPTIMIZATION; IMPACT; FILMS; LAYER;

D O I：

10.1038/s41560-018-0206-0

中图分类号：

TE [石油、天然气工业]; TK [能源与动力工程];

学科分类号：

0807 ; 0820 ;

摘要：

Sulfide kesterite Cu2ZnSnS4 provides an attractive low-cost, environmentally benign and stable photovoltaic material, yet the record power conversion efficiency for such solar cells has been stagnant at around 9% for years. Severe non-radiative recombination within the heterojunction region is a major cause limiting voltage output and overall performance. Here we report a certified 11% efficiency Cu2ZnSnS4 solar cell with a high 730 mV open-circuit voltage using heat treatment to reduce heterojunction recombination. This heat treatment facilitates elemental inter-diffusion, directly inducing Cd atoms to occupy Zn or Cu lattice sites, and promotes Na accumulation accompanied by local Cu deficiency within the heterojunction region. Consequently, new phases are formed near the hetero-interface and more favourable conduction band alignment is obtained, contributing to reduced non-radiative recombination. Using this approach, we also demonstrate a certified centimetre-scale (1.11 cm(2)) 10% efficiency Cu2ZnSnS4 photovoltaic device; the first kesterite cell (including selenium-containing) of standard centimetre-size to exceed 10%.

引用

页码：764 / 772

页数：9

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