29 March 2013 Scribing of thin film solar cells by picosecond and nanosecond pulsed lasers and performance improvement by gas injection
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Abstract
While utilization of renewable solar energy by converting to electricity via photovoltaic (PV) solar cells is one promising route to meet urgent energy needs without involving fossil fuel consumption or carbon dioxide emission, the challenge lies on reducing the cost per watt to compete with traditional fossil fuel technology. To this end, developing low cost PV manufacturing technologies at improved manufacturing and device efficiencies is primary challenge to ensure that solar energy is a viable and economic source for power needs. In this paper, recent efforts on short pulsed laser scribing processes of CIGS (Copper Indium Gallium Diselenide) thin film solar cells will be demonstrated. High repetition rate (~ 100 kHz) picosecond laser based results are compared with those by nanosecond laser. Advantages and limitations of picosecond laser scribing process will be discussed, and a tentative solution based on cost-effective nanosecond lasers will be proposed. A further improved scribing quality and accuracy will be also attempted by gas injection scheme.
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David J. Hwang, Di Liu, Hee K. Park, Dong X. Yu, "Scribing of thin film solar cells by picosecond and nanosecond pulsed lasers and performance improvement by gas injection", Proc. SPIE 8607, Laser Applications in Microelectronic and Optoelectronic Manufacturing (LAMOM) XVIII, 860719 (29 March 2013); doi: 10.1117/12.2004337; https://doi.org/10.1117/12.2004337
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