期刊
SOLAR ENERGY MATERIALS AND SOLAR CELLS
卷 248, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.solmat.2022.111982
关键词
Epitaxial lift-off; Quantum well; Thin-film solar cell; GaAs solar cell; Self-peeling; PMMA
资金
- European Research Council (ERC AdG AMETIST) [695116]
- Fortum and Neste Foundation [20210054]
- European Research Council (ERC) [695116] Funding Source: European Research Council (ERC)
This study reports on an epitaxial lift-off (ELO) process using an internal sacrificial stressor layer (ISSL) and a surface polymer stressor layer, which enables the development of flexible and lightweight thin-film III-V solar cell devices. The combined action of these layers enhances the lateral etching rate and promotes a more controllable release process.
Epitaxial lift-off (ELO) techniques enable the development of thin-film III???V solar cell devices that are flexible and lightweight. To this end, we report an ELO process employing an internal sacrificial stressor layer (ISSL) and a surface polymer (PMMA) stressor layer. The combined action enhances the lateral etching rate and promotes a more controllable release process. The ISSL consists of quantum well-like GaInAs heterostructures that enable an accurate control of the stress required to enhance the lateral etching of the sacrificial layer, and hence the release of the thin film. More specifically, the use of the ISSL results in about 5-fold faster etch rate of the AlAs sacrificial layer. The ISSL layers can be etched away after the lift-off. Likewise, the PMMA surface stressor, which serves also as a sacrificial intermediate transfer layer, can be easily removed. The proof-of-concept device demon-stration of the enhanced ELO technique was made by fabricating single-junction GaAs solar cells. The solar cell performance was evaluated under AM1.5d illumination and by external quantum efficiency measurements. Modelling based analysis shows that although the GaAs solar cell would require improvement of the front contact, yet the novel release process was successfully validated.
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