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      Self-Alignment of Bottom CZTSSe by Patterning of an Al 2O 3 Intermediate Layer

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          Abstract

          When CZTSSe is synthesized using a metal precursor, large voids of nonuniform size form at Mo back contact side. Herein, we demonstrate that the voids and CZTSSe in the lower part of the CZTSSe double layer can be controlled by using an Al 2O 3-patterned Mo substrate. The CZTSSe in the lower part self-aligns on the Mo-exposed area, while the voids self-align on the Al 2O 3-coated area. The origin of the self-alignment is expected to be the difference in bonding characteristics between liquid Sn and the metal or oxide surface, e.g., Al 2O 3. Good wettability generally forms between nonreactive liquid metals and metal surfaces due to the strong metallic bonding. By contrast, poor wettability generally forms between nonreactive liquid metals and oxide surfaces due to the weak van der Waals bonding between the liquid metal and the oxide layer. When the patterning was added, the device efficiency tended to decrease from 8.6% to 10.5%.

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          Most cited references 17

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          Device Characteristics of CZTSSe Thin-Film Solar Cells with 12.6% Efficiency

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            The path towards a high-performance solution-processed kesterite solar cell

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              Thin-film solar cells: device measurements and analysis

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                Author and article information

                Journal
                Nanomaterials (Basel)
                Nanomaterials (Basel)
                nanomaterials
                Nanomaterials
                MDPI
                2079-4991
                23 December 2019
                January 2020
                : 10
                : 1
                Affiliations
                [1 ]School of Materials Science and Engineering, Kyungpook National University, Daegu 41566, Korea; shhong@ 123456dgist.ac.kr (S.H.); ywheo@ 123456knu.ac.kr (Y.-W.H.)
                [2 ]Research Center for Thin Film Solar Cells, Daegu-Gyeongbuk Institute of Science and Technology (DGIST), Daegu 42988, Korea; kimseyun@ 123456dgist.ac.kr (S.-Y.K.); dhson@ 123456dgist.ac.kr (D.-H.S.); seunghyun@ 123456dgist.ac.kr (S.-H.K.); lynx012@ 123456dgist.ac.kr (Y.-I.K.); kjyang@ 123456dgist.ac.kr (K.-J.Y.)
                [3 ]Division of Energy Technology, Daegu-Gyeongbuk Institute of Science and Technology (DGIST), Daegu 42988, Korea
                Author notes
                [* ]Correspondence: apollon@ 123456dgist.ac.kr (J.-K.K.); monolith@ 123456dgist.ac.kr (D.-H.K.)
                [†]

                These authors contributed equally to this work.

                Article
                nanomaterials-10-00043
                10.3390/nano10010043
                7022898
                31878052
                © 2019 by the authors.

                Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license ( http://creativecommons.org/licenses/by/4.0/).

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