Ag alloying for modifications of carrier density and defects in Zn-rich (Ag,Cu)2ZnSnSe4 thin film solar cells

The Ag alloying Cu2ZnSnSe4 absorber has profound influences on the material properties including the carrier density, defects, grain structure and morphology, etc. It is found that Ag alloying could effective decrease the carrier density of Ag alloyed (Ag,Cu)2ZnSnSe4 (ACZTSe) absorbers and thus incr...

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Bibliographic Details
Published in:Journal of alloys and compounds 2020-11, Vol.842, p.155884, Article 155884
Main Authors: You, Xiaochen, Huang, Yanchan, Xie, Zhigao, Liang, Guangxing, Zhu, Hongbing, Mai, Yaohua
Format: Article
Language:English
Subjects:
Absorbers
ACZTSe
Ag alloying
Alloying
Carrier density
Chemical composition
Copper
Copper zinc tin selenide
Crystal defects
Defects
Depletion
Grain structure
Material properties
Morphology
Photovoltaic cells
Silver
Solar cells
Thin film solar cell
Thin films
Tin
Zinc
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Summary:The Ag alloying Cu2ZnSnSe4 absorber has profound influences on the material properties including the carrier density, defects, grain structure and morphology, etc. It is found that Ag alloying could effective decrease the carrier density of Ag alloyed (Ag,Cu)2ZnSnSe4 (ACZTSe) absorbers and thus increase the depletion region width (DRW) of corresponding kesterite solar cells. At the same time, the CuZn related defects are decreased and consequently the band tailing and possible Fermi level pinning could be supressed. In addition, further adjusting [Zn]/[Sn] ratios in Zn-rich ACZTSe absorbers could be helpful to the performance of solar cells due to a fine modification of the carrier density and defects. After optimizing of chemical compositions by combining both modifications, the Ag alloyed Zn-rich ACZTSe based kesterite thin film solar cells have achieved the highest efficiency of 8.68%, in which the Ag alloying content with respected to [Ag]/([Ag]+[Cu]) and the [Zn]/[Sn] ratio are 10% and 1.14, respectively. •Ag alloying could effective decrease the carrier density of ACZTSe absorbers.•The CuZn related band tailing could be suppressed by the Ag incorporation in ACZTSe absorbers.•The proper Zn-rich ([Zn]/[Sn]>1) in ACZTSe could be helpful to the performance of solar cells.•Ag alloyed Zn-rich ACZTSe thin film solar cells have achieved the highest efficiency of 8.68%.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2020.155884