Non-toxic precursor inks for low-temperature processable high-performance Cu2ZnSnS4 thin-film solar cells

Title
Non-toxic precursor inks for low-temperature processable high-performance Cu2ZnSnS4 thin-film solar cells
Authors
우규희김영우김규진김인혁김주선문주호
Issue Date
2013-05
Publisher
E-MRS
Abstract
Cu2ZnSn(S, Se)4 (CZTSSe) is currently one of the key functional materials in thin film photovoltaic devices due to its abundance and nontoxicity which are important criteria in view of the economical and largescale deployment of photovoltaics. In addition, the crystal structures and optical properties of CZTS are similar to those of CIGS, which allows sustainable and highly efficient solar cells to be developed. Here, we report a non-toxic solution based precursor ink for fabricating the CZTS absorber layer at lower annealing temperatures as low as 400°C. Stable precursor solution could be obtained by milling Cu salt, Zn, and Sn precursor in ethanol. The copper precursor needs to be easily decomposable to metallic copper at lower temperature. We selected the proper Cu precursor by comparing the decomposition behaviour of various Cu salts. In addition, the metal particles of Zn (420 °C) and Sn (231 °C) with low melting points are employed as the precursor to induce reactive liquid-phase sintering between constituent particles and/or intermediate compounds at low annealing temperature. Our ink reported here enables us to fabricate uniform, dense, contaminant-free, large-grained CZTS absorber layer at 400oC, which is compatible with polyimide (PI) plastic substrate. Based on this low temperature processable ink, we successfully demonstrated the fabrication of CZTS based solar cells with power conversion efficiency over 5 %.
URI
http://pubs.kist.re.kr/handle/201004/45043
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KIST Publication > Conference Paper
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