期刊
ACS APPLIED MATERIALS & INTERFACES
卷 6, 期 20, 页码 17740-17747出版社
AMER CHEMICAL SOC
DOI: 10.1021/am504194t
关键词
flexible thin-film solar cells; CIGS; aqueous sol-gel; low temperature processing
资金
- Korean government (MSIP) [2012R1A3A2026417]
- Brain Korea 21 Plus Project
Recently, environmental-friendly, solution-processed, flexible Cu(In,Ga)(S,Se)(2) devices have gained significant interest, primarily because the solution deposition method enables large-scale and low-cost production of photovoltaics, and a flexible substrate can be implemented on uneven surfaces in various applications. Here, we suggest a novel green-chemistry aqueous ink that is readily achievable through the incorporation of molecular precursors in an aqueous medium. A copper formate precursor was introduced to lower the fabrication temperature, provide compatibility with a polyimide plastic substrate, and allow for high photovoltaic performance. Through a comparative spectroscopic study on temperature-dependent chemical/crystal structural evolution, the chemical role of copper formate was elucidated, which led to the chalcopyrite framework that was appropriate to low-temperature annealed Cu(In,Ga)S-2 absorber layers at 400 degrees C. This Cu(In,Ga)S-2 solar cell exhibited a power conversion efficiency of 7.04% on a rigid substrate and 5.60% on a polymeric substrate. Our cell on the polymeric substrate also demonstrated both acceptable mechanical flexibility and durability throughout a repeated bending test of 200 cycles.
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