“…Diindium trisulfide b-In 2 S 3 , which replaces CdS to combine with ABX 2 (A¼ Cu, B ¼In, Ga, Al, and X ¼S, Se) family crystals is more environmental friendly and powerful for use in fabrication of solar-cell devices [1][2][3]. For the Cd-free solar cells (for green purpose), the use of b-In 2 S 3 buffer layer rendered the energy-conversion efficiency of thin-film solar cell to 12.9% [2,4].…”