An approach for the higher efficiency in the HIT cells

The highest conversion efficiency to date of 21.5% (confirmed by AIST) with a size of 100.3 cm/sup 2/ has been achieved in an HIT cell. Because of this high efficiency and the cell's superior temperature characteristics, HIT cells are highly regarded by consumers. Sanyo will increase the production volume of cells and modules to meet the demand both inside and outside of Japan. We have been investigating suitable materials based on Sanyo's technology for fabricating high-quality a-Si solar cells to obtain higher build-in potential and control the junction properties, and have been studying how to treat the surface to create a good interface without introducing any damage. We will continue our efforts to obtain even higher levels of conversion efficiency by using the high potential that this structure has.

[1]  M. Tanaka,et al.  Development of hit solar cells with more than 21% conversion efficiency and commercialization of highest performance hit modules , 2003, 3rd World Conference onPhotovoltaic Energy Conversion, 2003. Proceedings of.

[2]  W. Fuhs,et al.  AFORS-HET: a computer-program for the simulation of heterojunction solar cells to be distributed for public use , 2003, 3rd World Conference onPhotovoltaic Energy Conversion, 2003. Proceedings of.

[3]  M. Taguchi,et al.  HITTM cells—high-efficiency crystalline Si cells with novel structure , 2000 .

[4]  R. Schropp,et al.  Electrical Transport Mechanisms in p + a-SiC:H/n c-Si Heterojunctions: dark J-V-T Characteristics , 1996 .

[5]  T. Sawada,et al.  High-efficiency a-Si/c-Si heterojunction solar cell , 1994, Proceedings of 1994 IEEE 1st World Conference on Photovoltaic Energy Conversion - WCPEC (A Joint Conference of PVSC, PVSEC and PSEC).

[6]  P. Tüttö,et al.  In situ bulk lifetime measurement on silicon with a chemically passivated surface , 1993 .