Fabrication of (Cu,Ag)(2)SnS3 thin films by sulfurization for solar cells

作者：Nakashima Mitsuki^*; Hatayama Koichi; Yamaguchi Toshiyuki; Araki Hideaki; Nakamura Shigeyuki; Seto Satoru; Akaki Yoji; Sasano Junji; Izaki Masanobu

来源：Thin Solid Films, 2017, 642: 8-13.

DOI：10.1016/j.tsf.2017.09.010

• Thin-film solar cell
• (Cu,Ag)(2)SnS3
• Cu2SnS3
• Sulfurization

In this paper, we fabricated thin films composed of (Cu,Ag)(2)SnS3 using a sulfurization process for photovoltaic devices. The stacked NaF / Sn/(Ag + Cu) precursor was deposited by sequential evaporation of Ag, Cu, and Sn elements and NaF followed by crystallization in a mixed sulfur/tin atmosphere for 30 min at 530 degrees C and 570 degrees C, respectively. The X-ray diffraction patterns in all samples exhibited several peaks near the diffraction line of the monoclinic Cu2SnS3 (CTS) structure. Moreover, the lattice spacing increased according to Vegard's law as the [Ag] / ([Ag] + [Cu]) molar ratio in the films increased up to a value of approximately 0.05. Based on the results of scanning electron microscopy studies, the grain sizes for the produced thin films increased as the [Ag] / ([Ag] + [Cu]) molar ratio increased in the evaporation materials, while the performance of the solar cell fabricated with [Ag] / ([Ag] + [Cu]) = 0.05 and a sulfurization temperature of 570 degrees C corresponded to an open-circuit voltage of 244 mV, a short-circuit current density of 36.9 mA/cm(2), a fill factor of 0.45, and an efficiency of 4.07%.

• 出版日期2017-11-30