4.7 Article

Promising Cd-free double buffer layer in CZTSSe thin film solar cells

期刊

SCIENCE CHINA-MATERIALS
卷 64, 期 2, 页码 288-295

出版社

SCIENCE PRESS
DOI: 10.1007/s40843-020-1419-8

关键词

double buffer layer; CZTSSe; In-doping; band offset

资金

  1. National Key R&D Program of China [2019YFB1503500, 2018YFE0203400, 2018YFB1500200]
  2. National Natural Science Foundation of China [U1902218, 11774187]
  3. 111 Project [B16027]

向作者/读者索取更多资源

The study introduced an additional In(2)S(3) buffer layer and improved the properties of the Zn(O,S) and CZTSSe layers through post-annealing and etching treatments, resulting in an efficiency improvement of 24% in CZTSSe solar cells.
Zn(O,S) film is widely used as a Cd-free buffer layer for kesterite thin film solar cells due to its low-cost and eco-friendly characteristics. However, the low carrier concentration and conductivity of Zn(O,S) will deteriorate the device performance. In this work, an additional buffer layer of In(2)S(3)is introduced to modify the properties of the Zn(O,S) layer as well as the CZTSSe layerviaa post-annealing treatment. The carrier concentrations of both the Zn(O,S) and CZTSSe layers are increased, which facilitates the carrier separation and increases the open circuit voltage (V-OC). It is also found that ammonia etching treatment can remove the contamination and reduce the interface defects, and there is an increase of the surface roughness of the In(2)S(3)layer, which works as an antireflection layer. Consequently, the efficiency of the CZTSSe solar cells is improved by 24% after the annealing and etching treatments. Simulation and experimental results show that a large band offset of the In(2)S(3)layer and defect energy levels in the Zn(O,S) layer are the main properties limiting the fill factor and efficiency of these CZTSSe devices. This study affords a new perspective for the carrier concentration enhancement of the absorber and buffer layers by In-doping, and it also indicates that In2S3/Zn(O,S) is a promising Cd-free hybrid buffer layer for high-efficiency kesterite solar cells.

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