Strategies for Doped Nanocrystalline Silicon Integration in Silicon Heterojunction Solar Cells

Carrier collection in silicon heterojunction (SHJ) solar cells is usually achieved by doped amorphous silicon layers of a few nanometers, deposited at opposite sides of the crystalline silicon wafer. These layers are often defect-rich, resulting in modest doping efficiencies, parasitic optical absorption when applied at the front of solar cells, and high contact resistivities with the adjacent transparent electrodes. Their substitution by equally thin doped nanocrystalline silicon layers has often been argued to resolve these drawbacks. However, low-temperature deposition of highly crystalline doped layers of such thickness on amorphous surfaces demands sophisticated deposition engineering. In this paper, we review and discuss different strategies to facilitate the nucleation of nanocrystalline silicon layers and assess their compatibility with SHJ solar cell fabrication. We also implement the obtained layers into devices, yielding solar cells with fill factor values of over 79% and efficiencies of over 21.1%, clearly underlining the promise this material holds for SHJ solar cell applications.


Published in:
Ieee Journal Of Photovoltaics, 6, 5, 1132-1140
Year:
2016
Publisher:
Piscataway, Ieee-Inst Electrical Electronics Engineers Inc
ISSN:
2156-3381
Keywords:
Note:
IMT-NE Number : 845
Laboratories:


Note: The status of this file is: EPFL only


 Record created 2017-01-24, last modified 2018-11-14

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