Shen, Jie, Dingwen Zhang, Junjie Li, Xiaodong Li, Zhuo Sun, and Sumei Huang. 2013. “Fabrication and Evaluation of Low-Cost Cu2ZnSn(S,Se)4 Counter Electrodes for Dye-Sensitized Solar Cells”. Nano-Micro Letters 5 (4):281-88. https://doi.org/10.1007/BF03353759.