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Electron contact interlayers for low‐temperature‐processed crystalline silicon solar cells

AbstractThis study focuses on electron‐selective passivating contacts for crystalline silicon (c‐Si) solar cells where an interlayer is used to provide a low contact resistivity between the c‐Si substrate and the metal electrode. These electron contact interlayers are used in combination with other passivating interlayers (e.g., a‐Si:H, TiOx, and Nb2O5) to improve surface passivation whilst still permitting contact resistivities suitable for high‐efficiency solar cells. We show that a wide variety of thermally evaporated materials, most of which have ionic character, enable an Ohmic contact between n‐type c‐Si and Al. From this pool of compounds, we observed that CsBr has especially promising behavior because of its excellent performance and thermal stability when combined with thin passivating layers. With different test structures, we were able to demonstrate low contact resistance using TiOx/CsBr, Nb2O5/CsBr, and a‐Si:H/CsBr stacks on n‐type c‐Si. The quality of the provided surface passivation depended on the stack but we achieved the best overall passivation stability with TiOx/CsBr. Finally, we were able to demonstrate an efficiency >20% on a laboratory‐scale solar cell that implements the TiOx/CsBr/Al stack as full‐area rear‐side electron selective contact.
- UNSW Sydney Australia
- Technical University Eindhoven Netherlands
- Helmholtz-Zentrum Berlin für Materialien und Energie Germany
- Technical University Eindhoven Netherlands
- Eindhoven University of Technology Netherlands
citations This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).2 popularity This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.Average influence This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).Average impulse This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.Average
