[6p-A204-1~23] 16.3 Bulk, thin-film and other silicon-based solar cells

[6p-A204-2] a-Si:H/c-Si heterojunction solar cells with very thin silicon wafers (2)

〇Hitoshi Sai¹, Hiroshi Umishio^1,2, Takuya Matsui¹, Shota Nunomura¹, Tomoyuki Kawatsu³, Hidetaka Takato¹, Koji Matsubara¹ (1.AIST, 2.Tsukuba Univ., 3.Komatsu NTC Ltd.)

Keywords:solar cell, silicon, heterojunction

In this study, the impact of wafer thickness on the optical and electrical properties in c-Si solar cells are characterized using a series of Si wafers with thicknesses from 50 to 400 microns. Light absorption in very thin c-Si cells are characterized using SiN_X/c-Si/SiN_X test structures. It is confirmed that the light absorption within the thin c-Si cells can be enhanced close to the Lambertian limit. The impact of the wafer thickness on the electrical properties are experimentally evaluated by measuring the implied V_OC using (i)a-Si:H/c-Si/(i)a-Si:H test structures. a-Si:H/c-Si:H SHJ solar cells with very thin wafers are also fabricated and characterized. The potential of very thin SHJ solar cells are discussed.