Analysis of a-Si:H/TCO contact resistance for the Si heterojunction back-contact solar cell

作者：Lee Seung Yoon; Choi Hongsik; Li Hongmei; Ji Kwangsun; Nam Seunghoon; Choi Junghoon; Ahn Seh Won; Lee Heon Min; Park Byungwoo^*

来源：Solar Energy Materials and Solar Cells, 2014, 120: 412-416.

DOI：10.1016/j.solmat.2013.06.026

• Amorphous Si
• Heterojunction back-contact solar cell
• Contact resistance

The contact resistance of amorphous Si (a-Si:H)/transparent-conducting oxide (TCO) is evaluated and analyzed in terms of the contribution to the series resistance (R-s) and fill factor (FF) in the Si heterojunction back-contact (HBC) solar cell. It is shown that p-a-Si:H (emitter) and n-a-Si:H (back surface field: BSF)/TCO contact resistance are of similar values (0.37-38 Omega cm(2)) which are much higher than those of doped crystalline Si/metal contacts used in conventional Si solar cells. Of some factors affecting R-s loss in the HBC solar cell, BSF/TCO contact is the most significant one when considering the contact area. By interleaving the n-type microcrystalline Si (n-mu c-Si) between n-a-Si:H and TCO, 6-inch HBC solar cell with 20.5% efficiency is obtained, which was attributed to the reduced R-s and improved FF. It is noteworthy that the variations of R-s and FF are well estimated by measuring BSF-contact resistance, and are close to the empirical data: reduction in R-s to 1.77 Omega cm(2) and the increase in FF by 6.0% compared to the cell without n-mu c-Si interface layer. The results indicate that there is much room for higher efficiency by reducing the emitter- and BSF-contact resistance. Nonetheless, the method developed here can be a powerful tool to analyze the resistance component in HBC cell.

• 出版日期2014-1