Solar photovoltaic plays a vital role in the global energy scenario due to the increasing energy crisis, carbon footprint and environment changes. Silicon based solar cells dominating the PV technology in the PV industry level because of the ease process technique and efficiency figures. However the cost of conversion is relatively high in production. In this circumstance, it is highly desired to fabricate the high efficiency solar cells at lower cost. Hence PV technologists/industries are continuously putting their efforts to show consistent improvement in silicon technology to produce high efficiency solar cells with low cost. Solar cell fabrication process involves many critical fabrication steps which affects the power conversion efficiency by large extent. This includes surface texturization, diffusion, antireflective coatings, making contacts and metallization. Electrical parameters such as open circuit voltage, short circuit current and fill factor are the key factors in deciding the power conversion efficiency of solar cell. These parameters can be tailored either by using advance materials or by fine tuning the solar cell processes. This talk reveals the systematic approach on the solar cell processes to fabricate the high efficiency solar cells at lower cost by optimising the respective processes and using the advance alternate materials such as IPA free texture additive, Nano silver pastes etc. In order to reduce the reflectivity, the novel acid texturization process recipe was developed and it was explained with the respect to electrical parameters. Also the effect of different gaseous ambient during the POCl3 diffusion process was investigated and it was found that oxygen presence during the diffusion process plays an important role. In the same way optimised antireflective coatings and the better aspect ratio through optimised screen parameters were developed. Subsequently resistive losses in the contacts were studied and optimized for lower shadow losses to improve power conversion efficiency. The effect of optimized front contact pattern on the module performance was also studied. In conclusion, an improvement of overall ~0.5% in mono-and multi - crystalline solar cells was observed by optimising the process and using the advanced materials. The improved cell fabrication process was validated through the enhance performance at module level.
He is a diligent materials scientist having around 13 years of experience in semiconductor research and development (including doctoral, post doctoral and industrial experience). He is a qualified and experienced in silicon solar cell processing and solar module manufacturing. He has been awarded with Lean Six Sigma - Advanced Green Belt by Indian Statistical Institute, Bangalore. He has published over 24 papers in peer reviewed journals and over 24 presentations in seminars / symposium; contributed a chapter for the book entitled “Polymer thin films”; regularly delivering an invited technical lecture at the symposiums / universities and reviewing articles which had submitted to the international journals. He had worked at the University of New South whales @ the Australian Defense Force Academy as a visiting Post - Doctoral Fellow during 2005 on an Endeavour Research Fellowship awarded by the Government of Australia (One of the two Indians who received the award for the year 2005). He had guided engineering graduates for their projects.