A solid strategy to realize heteroface selective emitter and rear passivated silicon solar cells

Abstract

Passivated emitter and rear cell (PERC) with laser‐doped selective emitter (SE) has become mainstream in the PV industry. In this work, we report a solid strategy to realize heteroface monocrystalline silicon (mono‐Si) wafers for PERC‐SE solar cells by employing alkaline polishing to form a polished surface for the rear side and well‐established metal‐catalyzed chemical etching to form a honeycomb texture for the front side in one wet process successively. The key to success lies in the fact that the two back‐to‐back wafers inserted into one slot in the cassette are tightly attached together in MCCE etching so that only the exposed surfaces are etched to form textures, while the rear polished surfaces are still retained to avoid wrap‐around etching. With the strategy, the mono‐Si PERC‐SE solar cells achieve an average efficiency of over 22.0%, no poorer than that of the reference system (traditional alkaline texturing and rear acidic polishing), and have good light trapping capability for oblique incident light. Moreover, the total Si removal in the novel process is only ~0.4 g, which is far less than that in the traditional process. More importantly, the strategy can also double the throughput of existing texturing processes and significantly reduce the amount of etching waste. Therefore, the work is expected to provide a promising way to mass produce efficient mono‐Si PERC‐SE solar cells with a superior rear surface, achieved without increasing the number of processing steps, and lower cost.

An Artificial-Intelligence-Assisted Investigation on the Potential of Black Silicon Nanotextures for Silicon Solar Cells

“…Reported results indicate that the overall performance of MT IPD could be better than that of NT IPD . Furthermore, hierarchical and MCCE-IPD textures have better wide-angle absorption capability than MT RPD , as their light-trapping performance is less sensitive to the incident angle. , This unique absorption capability implies that the modules with such b-Si solar cells will retain a relatively high outdoor power output than MT RPD modules across the daytime when the modules have a fixed tilt angle. It should be noted that there is a common concern that the coverage of SiN x on b-Si is worse than that on microtextures, which may lead to more surface recombination.…”