Front Surface Glass Texturization for Improved Performance of Amorphous Silicon Solar Cell
Texturization of the front glass of superstrate type single junction amorphous silicon solar cells has been carried out in order to achieve the dual role of reducing reflectivity as well as increasing the angular scattering of light leading to more light trapping. Glass texturization has been carried out chemically using an aqueous solution of HF. To achieve a controlled etch rate (a) KOH or (b) AgNO3 is added to the aqueous solution of HF for selectively masking the front surface of glass with K2SiF6 or Ag nano-islands respectively. It may be noted that such texturing also increases the parasitic absorption due to larger light paths in the absorbing thin conducting oxide layer present in such superstrate type single junction amorphous silicon solar cells. Thus, an optimization is necessary for the top glass surface texturing for enhancement of the efficiency of the solar cell. It is found that the reflectivity reduces by about 3 % in both the cases from the reference value of about 9.5 %. Moreover, it is seen that the diffused transmission characteristics of the textured glass surface increases significantly (~30 %) which is expected to improve the overall short circuit current and efficiency of the solar cell. The present method of texturing the glass superstrate for anti reflection and light trapping in thin-film solar cells appears to be a promising method amenable for large scale applications.
KeywordsGlass texturing KOH Ag nano–islands Light trapping Amorphous silicon solar cells
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This work is supported by Department of Science and Technology (DST), Govt. of India. The authors would like to acknowledge Prof. A.K. Barua and Prof. R Bhattacharya for their support and encouragement. One of the authors (Sonali Das) would also like to thank Dr. S. M. Hossain for his constant motivation.
- 2.Young MinSong, JiHoonJang, JeongChulLee, EunKyuKang, YongTakLee,, Solar Energy Materials & Solar Cells 101,73 (2012).Google Scholar
- 3.Hongtao Cui, Supriya Pillai, Patrick Campbell, Martin Green, Solar Energy Materials & Solar Cells,109,2393(2013).Google Scholar
- 4.Ciprian Iliescu, Kwong Luck Tan, Francis EH Tay and Jianmin Miao, ICMAT 2005, 3-8 July 2005, Singapore.Google Scholar
- 6.Sonali Das, Chandan Banerjee, Avra Kundu, Prasenjit Dey, Hiranmay Saha, Swapan K. Datta, Journal of Physics D: Applied Physics, 46, 2013.Google Scholar