[13a-A202-1~12] 13.9 Compound solar cells

[13a-A202-10] The surface morphology change analysis of Ag₂Te layers in the two-step closed space sublimation process of AgGaTe₂

〇(M2)Yang Yu¹, Masakazu Kobayashi^1,2 (1.Waseda Univ. ASE., 2.Waseda Univ. ZAIKEN.)

Keywords:Solar cell, Ag2Te

AgGaTe₂ is a promising photovoltaic material available for using in high-efficiency solar cells. The growth process of AgGaTe₂ utilizes Ag₂Te buffer layer, which has attributed a high quality AgGaTe₂ thin film. The surface morphology change analysis of Ag₂Te layers in the two-step closed space sublimation process of AgGaTe₂.The annealing temperature was varied from 400 °C to 600 °C with annealing time of 15 min to 75min for Ag₂Te buffer layer. The surface morphological characterization of was performed using an optical microscope. The crystallographic properties were evaluated by a standard θ–2θ measurements using XRD. The Ag₂Te layer exhibited small holes randomly distributed on the surface at 400 °C to 500 °C. The Ag₂Te layer surface exhibited a rugged and hollow film structure after annealing at 600 °C.