Industrialized high-efficiency mono PERC cells

摘要

Passivated emitter and rear cell (PERC) technology can significantly increase the absolute efficiency of PV cells by over 1.2%. Since PERC processing is also compatible with current cell processing, and does not incur overly high manufacturing costs, many PV manufacturers are focusing on developing the industrialization technologies for PERC cells. This paper describes industrial p-type mono five-busbar (5BB) PERC cells with an average efficiency of 21.6%. Compared with standard aluminium back-surface field (Al-BSF) cells, the absolute efficiency has increased by 1.3%, and the open-circuit voltage (V_(oc)) has increased by 25mV, demonstrating that an aluminium oxide passivation film by atomic layer deposition (ALD) has excellent rear-side passivation performance. Furthermore, PERC cells have more concentrated efficiency distributions, which means they are able to achieve more than 300W module power in 60-cell standard modules. TongWei has set a target of achieving the mass production of PERC cells with an efficiency of over 22%. This paper also presents a loss analysis for current TongWei PERC cells, along with a roadmap of future efficiency development.