Abstract
Halide segregation and energy loss pose significant challenges for wide-bandgap perovskite solar cells, impairing their photovoltage and device stability. These issues are often exacerbated by inferior film quality and inhomogeneous halide distribution due to unbalanced crystallization processes. To address these challenges, we developed a novel strategy using a cation alloy that not only tailors the lattice properties and crystallization but also effectively passivates the defects. This approach enables homogeneous halide distribution and substantially reduced defect density. These improvements have led to a remarkable power conversion efficiency (PCE) of 19.50% with a record open-circuit voltage of 1.35 V for 1.79 eV perovskite solar cells, approaching ∼90% of its S-Q limit. Furthermore, the champion device could maintain 93% of its initial efficiency after operating at its maximum power point for 500 hours. By integrating these perovskite devices into a monolithic perovskite-organic tandem solar cell (PO-TSC) as the wide-bandgap subcell, we demonstrated a high PCE of 25.54%. This efficiency is among the highest values reported for PO-TSCs, presenting a significant step forward in these promising tandem cells.
| Original language | English |
|---|---|
| Journal | Energy and Environmental Science |
| DOIs | |
| Publication status | E-pub ahead of print - 6 Nov 2024 |
Bibliographical note
Publisher Copyright:© 2024 The Royal Society of Chemistry.
Funding
A. K. Y. J. thanks the sponsorship of the Lee Shau-Kee Chair Professor (Materials Science), and the support from the APRC Grant of the City University of Hong Kong (9380086, 9610508, 9610419, 9610440, and 9610492), the TCFS Grant (GHP/018/20SZ), the MHKJFS Grant (MHP/054/23) and MRP Grant (MRP/040/21X) from the Innovation and Technology Commission of Hong Kong, the Green Tech Fund (202020164) from the Environment and Ecology Bureau of Hong Kong, the GRF grants (11304424, 11307621, 11316422) from the Research Grants Council of Hong Kong, CRS grants (CRS_CityU104/23, CRS_HKUST203/23) from the Research Grants Council of Hong Kong, Guangdong Major Project of Basic and Applied Basic Research (2019B030302007), Guangdong-Hong Kong-Macao Joint Laboratory of Optoelectronic and Magnetic Functional Materials (2019B121205002), the Guangzhou Huangpu Technology Bureau (2022GH02) and Shenzhen Science and Technology Program (SGDX20201103095412040), Guangdong. J. Y. acknowledges financial support from Hong Kong Polytechnic University (Grant no. P0042930) and a grant from the Research Grants Council of the Hong Kong Special Administrative Region, China (Project No. PolyU 25300823).
