Investigation of Base High Doping Impact on the npn Solar Cell Microstructure Performance Using Physically Based Analytical Model

IEEE Access

Marwa S. S. Basyoni¹  A. Zekry²  Ahmed Shaker³ 

[1] Department of Computer Engineering, Computer Science and Engineering College, University of Ha&x2019;il, Ha&x2019;il, Saudi Arabia;

关键词: Analytical modeling;    high doping;    high efficiency;    low cost;    P+ base doping;   

DOI  :  10.1109/ACCESS.2021.3053625

来源: DOAJ

【 摘 要 】

Recently, there is a rapid trend to incorporate low cost solar cells in photovoltaic technology. In this regard, low-cost high-doped Silicon wafers are beneficial; however, the high doping effects encountered in these wafers render their practical use in fabrication. The npn solar cell microstructure has been found to avoid this issue by the proper design of vertical generation and lateral collection of the light generated carriers. We report on the impact of the p⁺ base doping concentration, up to 2 × 10¹⁹cm^-3, on the npn microstructure performance to find the most appropriate way for high efficiency. To optimize the structure, a series of design steps has been applied using our previously published analytical model. Before inspecting the high doped base effect, firstly, the n⁺ emitter is optimized. Secondly, the impact of bulk recombination inside the p⁺ base is introduced showing the range of optimum base width (W_p). Then, we investigate thoroughly the impact of base doping levels for different base widths to get the optimum W_p that satisfies maximum efficiency. The results show that for p⁺ base doping concentration ranging from 5 × 10¹⁷cm^-3 to 2 × 10¹⁹cm^-3, the npn microstructure efficiency decreases from 15.9% to 9%, respectively. Although the efficiency is degraded considerably for higher doping levels, the structure still achieves a competitive efficiency at higher doping levels, for which its cost is greatly reduced, in comparison with thin film solar cells. Moreover, using higher doping permits lesser wafer area which could be beneficial for large area solar cells design.design.

【 授权许可】

Unknown