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Void and secondary phase formation mechanisms of CZTSSe using Sn/Cu/Zn/Mo stacked elemental precursors

Title
Void and secondary phase formation mechanisms of CZTSSe using Sn/Cu/Zn/Mo stacked elemental precursors
Author(s)
Kim, Se-YunSon, Dae-HoKim, Young-illKim, Seung-HyunKim, SammiAhn, KwangseokSung, Shi-JoonHwang, Dae-KueYang, Kee-JeongKang, Jin-KyuKim, Dae-Hwan
Issued Date
2019-05
Citation
Nano Energy, v.59, pp.399 - 411
Type
Article
Author Keywords
CZTSSeFormation mechanismMetal precursorSecondary phaseTwo-step processVoid
Keywords
Tin compoundsCopperDealloyingEfficiencyGrain boundariesLayered semiconductorsMass transferZincCZTSSeFormation mechanismMetal precursorSecondary phaseTwo-step processVoidSulfur compoundsSemiconductor alloysTin
ISSN
2211-2855
Abstract
In recent years, Cu 2 ZnSn(S 1-x Se x ) 4 (CZTSSe) prepared by a two-step process using metal precursors has been reported to exhibit a relatively high power conversion efficiency, and a high efficiency of 12.5% by two-step process contained via sputtering method was recently confirmed by our group. In this study, we proposed formation mechanisms for the CZTSSe double layer, voids and ZnSSe layer, which were observed in the CZTSSe using metal precursor. Due to the persistent dezincification from the metal precursors and preferential reaction between the Zn and chalcogens such as S and Se, almost all Zn is consumed to form the ZnSSe layer; as a result, large voids are produced first under the ZnSSe layer. Cu 2 Se and SnSe are grown on the ZnSSe layer via migration of the Cu and Sn through the grain boundaries of the ZnSSe layer. Thus, additional small voids are expected to form due to the mass transfer of Cu and Sn. Because of the preferentially formed ZnSSe layer and the chalcogenation of Cu and Sn after the mass transfer, a CZTSSe double layer can be formed, and ZnSSe can exist between these CZTSSe layers. Finally, we propose a method based on the formation mechanism to control the voids and secondary phases, which affect the fill factor and output current. © 2019 Elsevier Ltd
URI
http://hdl.handle.net/20.500.11750/9694
DOI
10.1016/j.nanoen.2019.02.063
Publisher
Elsevier BV
Related Researcher
  • 성시준 Sung, Shi-Joon
  • Research Interests Thin Film Solar Cells; 박막태양전지; Compound Semiconductor Materials & Processes; 화합물 반도체 재료 및 공정; Optoelectronic Devices based on Micro-Optical Structures; 미세 광학 구조 기반 광전자소자; Organic/Inorganic/Metallic Hybrid Thin Films & Applications; 유무기금속 하이브리드 박막
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Division of Energy & Environmental Technology 1. Journal Articles
Division of AI, Big data and Block chain 1. Journal Articles

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