High efficiency process development for defect-rich silicon wafer materials

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The silicon wafer is a major cost driver for solar cells based on crystalline silicon. This work describes the influence of different solar cell processing steps on a variety of cheap but defect-rich alternative multicrystalline silicon wafer materials. A high efficiency lab-type solar cell process is presented, which allows the determination of the solar cell efficinecy limit for a very broad range of different silicon wafer materials. The process features a single sided front texture, tunable defect engineering via gettering and hydrogenation and a very low thermal budget dielectric rear side passivation with local laser fired contacts.
The silicon wafer is a major cost driver for solar cells based on crystalline silicon. This work describes the influence of different solar cell processing steps on a variety of cheap but defect-rich alternative multicrystalline silicon wafer materials. A high efficiency lab-type solar cell process is presented, which allows the determination of the solar cell efficinecy limit for a very broad range of different silicon wafer materials. The process features a single sided front texture, tunable defect engineering via gettering and hydrogenation and a very low thermal budget dielectric rear side passivation with local laser fired contacts.

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Johannes Junge

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