期刊
SUSTAINABLE ENERGY & FUELS
卷 1, 期 3, 页码 593-598出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7se00096k
关键词
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资金
- U.S. Department of Energy through the Bay Area Photovoltaic Consortium [DE-EE0004946]
- Department of Energy, Energy Efficiency and Renewable Energy Program [DE-EE0006335]
- Engineering Research Center Program of the National Science Foundation
- Office of Energy Efficiency and Renewable Energy of the Department of Energy under NSF [EEC-1041895]
We demonstrate silicon heterojunction solar cells with microscale effectively transparent front contacts (ETCs) that redirect incoming light to the active area of the solar cell. Replacing standard contact electrodes by ETCs leads to an enhancement in short circuit current density of 2.2 mA cm(-2) through mitigation of 6% shading losses and improved antireflection layers. ETCs enable low loss lateral carrier transport, with cells achieving an 80.7% fill factor. Furthermore, dense spacing of the contact lines allows for a reduced indium tin oxide thickness and use of non-conductive, optically optimized antireflection coatings such as silicon nitride. We investigated the performance of ETCs under varying light incidence angles, and for angles parallel to the ETC lines find that there is no difference in photocurrent density with respect to bare indium tin oxide layers. For angles perpendicular to the ETC lines, we find that the external quantum efficiency (EQE) always outperforms cells with flat contact grids.
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