Sep 19, 2016

GaAs solar cell on Si substrate with good ohmic GaAs/Si interface by direct wafer bonding


•We report wafer bonding (WB) techniques giving good ohmic interfaces of GaAs/Si.

•WB with a low bonding temperature and short processing time was performed.

•We demonstrated the GaAs solar cell on Si substrate by WB techniques.

•Fabricated GaAs solar cell on Si exhibited a comparable performance with that on GaAs.

•We proved the feasibility of stable WB technologies of GaAs/Si substrates.

In this work, we developed wafer bonding techniques to bond GaAs and Si wafers. Wafer bonding was carried out at room temperature without high temperature annealing processes. The bonded interface showed a low interface resistance of 8.8×10−3 Ω cm2. We also exploited the new bonding techniques to fabricate a GaAs solar cell on a Si substrate. The solar cell showed a high energy conversion efficiency (13.25%) even without an anti reflection coating. The performance of the fabricated GaAs/Si solar cell was comparable to that of a homogeneous GaAs solar cell grown on a GaAs substrate. *Corresponding author.

Keywords:   Wafer bonding;   GaAs on Si;   GaAs solar cell;   GaAs/Si

Source: Sciencedirect

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