Proceedings of nanoGe Spring Meeting 2022 (NSM22)
DOI: https://doi.org/10.29363/nanoge.nsm.2022.239
Publication date: 7th February 2022
As the efficiency of 2-terminal PK/Si tandem devices continues to increase towards 30% in the laboratory, the question of manufacturability of these devices must be addressed. This is important as the efficiency gap between what is being currently made in laboratory and what is possible using more scalable methods and materials is a critical issue for the future of this technology. Specifically, the integration of these devices into established PV process flows must be investigated to understand where adaption is possible and where new processes must be made. To this end, we present a proposed process flow for the fabrication of large area 2-terminal PK/Si tandems based on a heterojunction bottom cell. Methods to adapt chemical etch, metallization, and encapsulation are presented. Additionally, a high throughput meniscus coating approach for the perovskite layer will be demonstrated and the integration challenges discussed. Using this process flow, we demonstrate that PK/Si tandem solar cells based on commercially available CZ M2 wafers can be fabrication with efficiencies of over 22% on an active area of 100 cm2.
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