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Control of Zn Content and Influence on Cu2ZnSnSe4 Thin-Film Solar Cells Fabricated by Coevaporation

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The influence of the Zn content on the properties of a coevaporated Cu2ZnSnSe4 absorber layer was investigated. Cu2ZnSnSe4 (CZTSe) precursors deposited with various Zn composition ratios ([Zn]/[Sn] = 1.03, 1.06, 1,08, 1.17) were annealed using the rapid thermal process without any Se vapor pressure at 590 °C to reduce the possibility of volatile SnSe loss. Scanning electron microscope observations showed that the grain size and surface morphology of the CZTSe absorber layer change depending on the Zn content. Furthermore, X-ray diffraction analyses were performed to determine the crystal quality of the CZTSe absorber layer in terms of the full width at half maximum of the characteristic X-ray diffraction peak and texture coefficient. Raman spectroscopy showed a ZnSe secondary phase in the CZTSe absorber layer with excess Zn. The CZTSe solar cell with the optimal Zn content ([Zn]/[Sn] = 1.06) exhibited a 6.11% conversion efficiency in a 0.42 cm2 active area.
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Keywords: CZTSe Solar Cells; Coevaporation; Composition Dependence; Rapid Thermal Process; Zn

Document Type: Research Article

Affiliations: 1: Convergence Research Center for Solar Energy, Daegu Gyeongbuk Institute of Science and Technology (DGIST), 333 Techno jungang-daero, Dalsung-gun, Daegu, 42988, Republic of Korea 2: Department of Physics, Sogang University, 35 Baekbeom-ro, Mapo-gu, Seoul, 04107, Republic of Korea

Publication date: 01 November 2017

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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