Thin-film silicon triple-junction solar cell with 12.5% stable efficiency on innovative flat light-scattering substrate

Several thin-film solar cell technologies require light-trapping schemes that are predominantly based on depositing the solar cells on rough surfaces. While this approach efficiently increases the density of photo-generated carriers, open-circuit voltage and fill factor generally decrease. Substrates that decouple the growth interface from the light-scattering interface were previously proposed as a solution to this dilemma, and proof-of-concepts were demonstrated in thin film-silicon solar cells. In this contribution, we review as an introduction the problematic of rough versus smooth interface for n-i-p single-junction lc-Si:H cells. Then, the benefits of the newly developed substrate that decouples the growth and scattering interfaces are investigated in n-i-p triple-junction a-Si:H/lc-Si:H/lc-Si:H solar cells for the first time. Conversion efficiencies of 13.7% (initial) and 12.5% (stabilized) are obtained, which are among the highest ever reported for such devices.


Published in:
Journal of Applied Physics, 112, 11, 114503
Year:
2012
Publisher:
Melville, American Institute of Physics
ISSN:
0021-8979
Note:
IMT-NE Number: 675
Laboratories:




 Record created 2012-12-14, last modified 2018-12-03

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