Abstract
The PV industry has shown more than 30% annual growth rate in the past two to
three years due to the global PV industry boom and shows a promising future.
However, it appears to have difficulties in rapid distributions due to
insufficient p-Si, a raw material, volume and low solar cell conversion
efficiency. The PV unit cost is 3 to 4 times more expensive than other
renewable energies and 6 to 10 times more expensive than fossil fuels.
In order to resolve such issues, solar cell makers focus in next-generation
solar cells such as thin film a-Si solar cells which minimize Si materials,
CdTe based solar cells, CIS/CIGS based solar cells, and flexible thin film
solar cells to cut the cell manufacturing cost. Of this, the thin film a-Si
solar cell technology is recognized as a research field to manufacture
inexpensive high efficiency solar cells to innovatively enhance the PV
economic efficiency by replacing expensive crystalline silicon solar cell.
Recently, there have been large-scale investments made in this field. It is
being produced in countries focused in Japan, Taiwan, and Europe.
Displaybank published "Thin Film a-Si Solar Cell Technology" regarding such
thin film a-Si solar cell technology. It analyzed the technology targeting
released and registered WIPS DB patents in Korea, Japan, Europe, and U.S. from
1977 to October 31, 2008 along with INPADOC and G-PAT patent database.
This report categorized the thin film a-Si solar cell technology basically by
major maker and applicant. The technology was divided into RaSubstrate,
RaTransparent Electrode, RaMetal Electrode, RaAbsorption Layer, RaInterlayer,
RaStructure, RaLaser Scribing, RaModule technology. Specially, this report
analyzed the key patent of thin film a-Si solar cell manufacturing technology
applied by major makers by yearly flow chart that it allowed readers to
understand major technologies' development trend and patent rights at one
glance.
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