Abstract
Halide segregation critically limits the stability of mixed-halide perovskite solar cells under device operational conditions. There is a strong indication that halide oxidation is the primary driving force behind halide de-mixing. To alleviate this problem, we develop a series of multifunctional redox mediators based on anthraquinone that selectively reduce iodine and oxidize metallic Pb0, while simultaneously passivating defects through tailored cationic substitution. These effects enable wide-bandgap perovskite solar cells to achieve a power conversion efficiency of 19.58% and a high open-circuit voltage of 1.35 V for 1.81-eV PSCs. The device retains 95% of its initial efficiency after operating at its maximum power point for 500 h. Most notably, by integrating the perovskite device into the monolithic perovskite-organic tandem solar cell as a wide-bandgap subcell, we report an efficiency of 25.22% (certified 24.27%) with impressive long-term operational stability (T90 > 500 h).
| Original language | English |
|---|---|
| Pages (from-to) | 411-421 |
| Number of pages | 11 |
| Journal | Nature Energy |
| Volume | 9 |
| Issue number | 4 |
| Early online date | 26 Jan 2024 |
| DOIs | |
| Publication status | Published - Apr 2024 |
| Externally published | Yes |
Bibliographical note
Publisher Copyright:© The Author(s), under exclusive licence to Springer Nature Limited 2024.
Funding
We thank Y. An and H.-L. Yip from City University of Hong Kong for conducting the optical simulation, and Nano-X from Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences (SINANO) for technical support. A.K.-Y.J. is thankful for the sponsorship of the Lee Shau-Kee Chair Professor (Materials Science) and support from APRC grants from the City University of Hong Kong (9380086, 9610419, 9610492 and 9610508), a TCFS grant (GHP/018/20SZ), an 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, GRF grants (11307621 and 11316422) from the Research Grants Council of Hong Kong, Shenzhen Science and Technology Program (SGDX20201103095412040), Guangdong Major Project of Basic and Applied Basic Research (2019B030302007), Guangdong-Hong Kong-Macao Joint Laboratory of Optoelectronic and Magnetic Functional Materials (2019B121205002), Guangzhou Huangpu Technology Bureau (2022GH02) and a CRF grant (C6023-19GF) from the Research Grants Council of Hong Kong. J.Y. acknowledges support from the Hong Kong Polytechnic University (grant no. P0042930). The work described in this paper was partially supported by a fellowship award from the Research Grants Council of the Hong Kong Special Administrative Region, China (project no. CityU PDFS2223-1S08).
