期刊
ADVANCED ENERGY MATERIALS
卷 10, 期 9, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201903553
关键词
2D perovskites; perovskite-silicon tandem; perovskite solar cells; surface coating; wide bandgap
类别
资金
- Australian Government through the Australian Renewable Energy Agency (ARENA)
- Australian Centre for Advanced Photovoltaics (ACAP)
- Australian Research Council - Australian Government [FT180100302]
- Helmholtz Association through the HYIG [FKZ VH-NG-1148]
- project PEROSEED [FKZ ZT-0024]
- Helmholtz Energy Materials Foundry (HEMF)
- Recruitment Initiative of B.S.R.
- Karlsruhe School of Optics & Photonics (KSOP)
- Australian Research Council [FT180100302] Funding Source: Australian Research Council
Mixed-dimensional perovskite solar cells combining 3D and 2D perovskites have recently attracted wide interest owing to improved device efficiency and stability. Yet, it remains unclear which method of combining 3D and 2D perovskites works best to obtain a mixed-dimensional system with the advantages of both types. To address this, different strategies of combining 2D perovskites with a 3D perovskite are investigated, namely surface coating and bulk incorporation. It is found that through surface coating with different aliphatic alkylammonium bulky cations, a Ruddlesden-Popper quasi-2D perovskite phase is formed on the surface of the 3D perovskite that passivates the surface defects and significantly improves the device performance. In contrast, incorporating those bulky cations into the bulk induces the formation of the pure 2D perovskite phase throughout the bulk of the 3D perovskite, which negatively affects the crystallinity and electronic structure of the 3D perovskite framework and reduces the device performance. Using the surface-coating strategy with n-butylammonium bromide to fabricate semitransparent perovskite cells and combining with silicon cells in four-terminal tandem configuration, 27.7% tandem efficiency with interdigitated back contact silicon bottom cells (size-unmatched) and 26.2% with passivated emitter with rear locally diffused silicon bottom cells is achieved in a 1 cm(2) size-matched tandem.
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