Comparison of the Electrical Properties of PERC Approach Applied to Monocrystalline and Multicrystalline Silicon Solar Cells

Enyu Wang,Hong Yang,He Wang

doi:10.1155/2016/8982376

Abstract

At present, the improvement in performance and the reduction of cost for crystalline silicon solar cells are a key for photovoltaic industry. Passivated emitter and rear cells are the most promising technology for next-generation commercial solar cells. The efficiency gains of passivated emitter and rear cells obtained on monocrystalline silicon wafer and multicrystalline silicon wafer are different. People are puzzled as to how to develop next-generation industrial cells. In this paper, both monocrystalline and multicrystalline silicon solar cells for commercial applications with passivated emitter and rear cells structure were fabricated by using cost-effective process. It was found that passivated emitter and rear cells are more effective for monocrystalline silicon solar cells than for multicrystalline silicon solar cells. This study gives some hints about the industrial-scale mass production of passivated emitter and rear cells process.

Highlights

Photovoltaic market was dominated by standard crystalline silicon solar cells which were based on boron-doped crystalline silicon wafers with processes of phosphorus diffusion, silicon nitride antireflection coatings on front side, screen-printed silver past on front side, and aluminum paste on rear side forming a back surface field (Al-BSF)
The annealing process was helpful for Cz-Si passivated emitter and rear cells (PERC), obtaining about 0.2% further improvement
PERC approach applied to multicrystalline silicon solar cells (Mc-Si) was not as effective as that applied to Cz-Si

Summary

Introduction

Photovoltaic market was dominated by standard crystalline silicon solar cells which were based on boron-doped crystalline silicon wafers with processes of phosphorus diffusion, silicon nitride antireflection coatings on front side, screen-printed silver past on front side, and aluminum paste on rear side forming a back surface field (Al-BSF). In PERC structure, a dielectric layer was fabricated on the rear side of solar cells replacing aluminium back surface field. This was advantageous to reduce the rear surface recombination and increase internal reflection on rear surface. Higher efficiency solar cells could be obtained

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