Journal
SOLAR RRL
Volume 7, Issue 3, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/solr.202201026
Keywords
atomic layer deposition (ALD); electron transport layers; open-circuit voltage; wide bandgap; ZnO-SnO2 bilayer
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This study reports an atomic layer deposited ZnO-SnO2 bilayer electron transport layer (ETL) for wide-bandgap mixed-halide perovskite solar cells (PSCs). The bilayer exhibits high uniformity and conformality over a large area. It shows a matched band alignment with wide-bandgap perovskite, resulting in efficient electron extraction and transport, and achieves a champion power conversion efficiency of 18.1% with an ultrahigh open-circuit voltage (V-oc) of 1.233 V.
High-quality electron transport layer (ETL) is a prerequisite for high-performance wide-bandgap mixed-halide perovskite solar cells (PSCs), which is critical for efficient perovskite/silicon tandem solar cells. Herein, an atomic layer deposited ZnO-SnO2 bilayer ETL for wide-bandgap PSCs is reported, featuring a high uniformity and conformality over a large area. The ZnO-SnO2 bilayer shows a matched band alignment with wide-bandgap perovskite for efficient electron extraction and transport, with a lower nonradiative recombination. As a result, a champion power conversion efficiency of 18.1% is achieved on the ZnO-SnO2 bilayer-based wide-bandgap PSCs featuring an ultrahigh open-circuit voltage (V-oc) of 1.233 V, which is the highest value for wide-bandgap PSCs without any surface passivation. In addition, the atomic layer deposition ZnO-SnO2 bilayer exhibits very good surface passivation and conformality on crystalline silicon surfaces, which makes it attractive to be applied for perovskite/silicon tandem solar cells with a higher V-oc and textured surfaces.
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