Research Paper

１． Noboru Katayama, Suguru Osawa, Shunya Matsumoto, Takuma Nakano, Mutsumi Sugiyama,“Degradation and Fault Diagnosis of Photovoltaic Cells using Impedance Spectroscopy”, Solar Energy Materials and Solar Cells, 194 (2019) pp. 130-136.

２． Taichi Tosuke, Mutsumi Sugiyama,“Sulfurization growth and HCl etching processes for cubic-phase SnS thin films”, Physica Status Solidi A, 216 (2019) 1800750-1～4.

３． Ishwor Khatri, Junpei Matsuura, Mutsumi Sugiyama, and Tokio Nakada, “Effect of heat-bias-soaking on caesium fluoride-treated CIGS thin film solar cells”, Progress in Photovoltaics: Research and Applications, 27 (2019) 22-29.

４． Yusuke Ohteki and Mutsumi Sugiyama, “Electrical properties of ZnO:H films fabricated by RF sputtering deposition and fabrication of p-NiO/n-ZnO heterojunction devices”, Japanese Journal of Applied Physics, 57 (2018) 071101-1～5.

５． Junpei Matsuura, Kosuke Shudo, Ishwor Khatri, Mutsumi Sugiyama, Tokio Nakada, “Tunable carrier concentration of NaF-treated CIGS solar cells using heat-light soaking and subsequent heating”, physica status solidi - Rapid Research Letters, 12 (2018) 1800053.

６． Ishwor Khatri, Kosuke Shudo, Junpei Matsuura, Mutsumi Sugiyama, Tokio Nakada, “Impact of heat-light soaking on potassium fluoride treated CIGS solar cells with CdS buffer layer”, Progress in Photovoltaics: Research and Applications, 26 (2018) 171-178.