Low-cost industrial technologies of crystalline silicon solar cells
- Interuniversity Microelectronics Center, Leuven (Belgium)
Approximately 2 billion people, mainly in Third World countries, are not connected to an electric grid. The standard, centralized grid development is too expensive and time consuming to solve the energy demand problem. Therefore, there is a need for decentralized renewable energy sources. The main attractiveness of solar cells is that they generate electricity directly from sunlight and can be mounted in modular, stand-alone photovoltaic (PV) systems. Particular attention is paid in this paper to crystalline silicon solar cells, since bulk silicon solar-cell (mono and multi) modules comprise approximately 85% of all worldwide PV module shipments. Energy conversion efficiency as high as 24% has been achieved on laboratory, small-area monocrystalline silicon cells, whereas the typical efficiency of industrial crystalline silicon solar cells is in the range of 13--16%. The market price of PV modules has remained for the last few years in the range of $3.5--4.5/watt peak (Wp). For the photovoltaic industry, the biggest concern is to improve the efficiency and decrease the price of the commercial PV modules. Efficiency-enhancement techniques of commercial cells are described in detail. Adaptation of many high-efficiency features to industrially fabricated solar cells resulted in efficiencies above 17% for multicrystalline and above 18% for monocrystalline silicon solar cells. The latest study shows that increasing the PV market size toward 500 MWp/y and accounting for realistic industrial improvements can lead to a drastic PV module price reduction down to $1/Wp. 120 refs.
- OSTI ID:
- 522399
- Journal Information:
- Proceedings of the IEEE, Vol. 85, Issue 5; Other Information: PBD: May 1997
- Country of Publication:
- United States
- Language:
- English
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