On the origin of band-tails in kesterite

被引：157

作者：

Rey, G. ^{[1
]}

Larramona, G. ^{[2
]}

Bourdais, S. ^{[2
]}

Chone, C. ^{[2
]}

Delatouche, B. ^{[2
]}

Jacob, A. ^{[2
]}

Dennler, G. ^{[2
]}

Siebentritt, S. ^{[1
]}

机构：

[1] LPV, Phys & Mat Sci Res Unit, 41 Rue Brill, L-4422 Belvaux, Luxembourg

[2] IMRA Europe SAS, 220 Rue Albert Caquot, F-06904 Sophia Antipolis, France

来源：

SOLAR ENERGY MATERIALS AND SOLAR CELLS | 2018年 / 179卷

关键词：

Kesterite; Band-tail; Photoluminescence; CZTSe; CZTSSe; CU2ZNSNS4; THIN-FILMS; SOLAR-CELLS; OPTICAL-PROPERTIES; DISORDER; GAP; TEMPERATURE; ZN; CU; PHOTOLUMINESCENCE; FLUCTUATIONS;

D O I：

10.1016/j.solmat.2017.11.005

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：

Kesterite Cu2ZnSn(SxSe1-x)(4) is an attractive earth-abundant material for low-cost thin film photovoltaics with the capability to achieve power production in the terawatt range and therefore to supply a significant part of the global electricity needs. Despite its advantageous optical and electrical properties for photovoltaic applications, the large band tailing causes voltage losses that limit the efficiency of kesterite-based devices. Here we show that the band-tailing originates mainly from band-gap fluctuations attributable to chemical composition variations at nanoscale; while electrostatic fluctuations play a lesser role. Absorption measurement reveal that the Cu-Zn disorder, always present in kesterite Cu2ZnSn(SxSe1-x)(4), is not the main source of the large band tailing. Instead defect clusters having a significant impact on the band-edge energies, e.g. [2Cu(Zn)(-)+Sn-Zn(2+)], are proposed as the main origin for the kesterite band tail.

引用

页码：142 / 151

页数：10

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