Enhancement of solar cell efficiency through laser assisted surface texturing
摘要
The most abundant and easily available energy source is sunlight. Solar cells are able to convert solar energy to electrical energy; the quantity of electrical energy produced can be increased by improving the light trapping ability of solar cells. Surface texturing is an excellent method to achieve light trapping at a reasonable cost. Mono-crystalline solar cells have dominated the solar cell market for decades, and still have 90% of the market share. Multi-crystalline solar cells have lower efficiency, but have gained attention due to their low fabrication cost. Lasers already play a vital role in solar cell production due to their versatility and low maintenance compared to chemical techniques. Laser assisted surface texturing can be applied to both mono and multi-crystalline silicon solar cells, which is not practical through conventional etching techniques. In the current article, the laser assisted surface texturing of solar cells with features in micro- and nano-scale are presented. Also, methods to improve silicon-based solar cells and the principles of optical enhancement via surface texturing are studied in detail.