期刊
IEEE JOURNAL OF PHOTOVOLTAICS
卷 8, 期 5, 页码 1384-1389出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JPHOTOV.2018.2851283
关键词
High-growth rate; hydride vapor phase epitaxy (HVPE); III-V semiconductor materials; spalling
资金
- Colorado Energy Research Collaboratory
Substrate reuse offers a promising route toward enabling high-efficiency III-V solar cells to become cost-competitive for one-sun terrestrial applications. In this study, Ge films were spalled using an electroplated Ni stressor layer, and the fracture surface was characterized. Initial heteroepitaxial GaAs films grown on spalled Ge substrates by hydride vapor phase epitaxy were found to be single crystal with nearly equivalent growth rates between growth on epi-ready and unpolished spalledGe substrates. We show the first demonstration of III-V solar cells (GaInAsP, E-g similar to 1.7 eV) grown on unpolished spalled Ge substrates to assess the viability of substrate reuse. We demonstrate equivalent performance for a solar cell grown on spalled Ge and on a coloaded epiready Ge substrate, despite the residual roughness on the spalled Ge substrate and the lack of any substrate surface preparation. This initial demonstration of combining substrate reuse with the ability to grow III-V solar cells using a high growth rate and high throughput deposition process is a promising step toward low-cost III-V photovoltaics.
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