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Effect of al2o3 dot patterning on cztsse solar cell characteristics

Title
Effect of al2o3 dot patterning on cztsse solar cell characteristics
Authors
Kim, Se-YunHong, Sang HunKim, Seung-HyunSon, Dae-HoKim, Young-IlKim, SammiYoung-Woo HeoKang, Jin-KyuKim, Dae-Hwan
DGIST Authors
Son, Dae-Ho; Kang, Jin-KyuKim, Dae-Hwan
Issue Date
2020-09
Citation
Nanomaterials, 10(9), 1-9
Type
Article
Article Type
Article
Author Keywords
Back-contact passivationCZTSSeMetal precursorTwo-step processVoid arrangement
Keywords
EFFICIENCYPASSIVATIONGROWTH
ISSN
2079-4991
Abstract
In this study, a 5-nm thick Al2O3 layer was patterned onto the Mo electrode in the form of a dot to produce a local rear contact, which looked at the effects of this contact structure on Cu2ZnSn(S1-xSex)4 (CZTSSe) growth and solar cell devices. Mo was partially exposed through open holes having a square dot shape, and the closed-ratios of Al2O3 passivated areas were 56%, 75%, and 84%. The process of synthesizing CZTSSe is the same as that of the previous process showing 12.62% efficiency. When the 5-nm-Al2O3 dot patterning was applied to the Mo surface, we observed that the MoSSe formation was well suppressed under the area coated of 5-nm-Al2O3 film. The self-alignment phenomenon was observed in the back-contact area. CZTSSe was easily formed in the Mo-exposed area, while voids were formed near the Al2O3-coated area. The efficiency of the CZTSSe solar cell decreased when the Al2O3 passivated area increased. The exposure area and pitch of Mo, the collecting path of the hole, and the supplying path of Na seemed to be related to efficiency. Thus, it was suggested that the optimization of the Mo-exposed pattern and the additional Na supply are necessary to develop the optimum self-aligned CZTSSe light absorber. © 2020 by the authors. Licensee MDPI, Basel, Switzerland.
URI
http://hdl.handle.net/20.500.11750/12760
DOI
10.3390/nano10091874
Publisher
MDPI AG
Related Researcher
Files:
There are no files associated with this item.
Collection:
Division of Energy Technology1. Journal Articles


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