Zhang, K;
Liu, C;
Peng, Z;
Li, C;
Tian, J;
Li, C;
Cerrillo, JG;
... Brabec, CJ; + view all
(2024)
Binary cations minimize energy loss in the wide-band-gap perovskite toward efficient all-perovskite tandem solar cells.
Joule
, 8
(10)
pp. 2863-2882.
10.1016/j.joule.2024.07.003.
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JOULE-D-23-01633.pdf - Accepted Version Access restricted to UCL open access staff until 17 October 2025. Download (1MB) |
Abstract
Perovskite-based tandem solar cells stand at the forefront of photovoltaic innovation due to their exceptional performance and cost-effective fabrication. This study focuses on minimizing energy losses within a 1.80 eV perovskite sub-cell. We demonstrate that the surface treatment of perovskite with binary guanidinium bromide and 4-fluorophenylammonium iodide synergistically reduces defect densities and adjusts interfacial energy-level alignment. The enhanced passivation effect and the formation of a surface dipole significantly reduce nonradiative recombination and transport losses, leading to a notable increase in the open-circuit voltage and fill factor product, thereby achieving an impressive power conversion efficiency (PCE) of 19.0%. The reproducibility of these findings is confirmed by consistent results across different laboratories. Furthermore, integration with a narrow-band-gap perovskite yields an all-perovskite tandem device with a PCE of 27.2%. This comprehensive understanding of the pivotal role of spacer cations in surface treatment significantly advances the pathway toward efficient perovskite photovoltaics.
| Type: | Article |
|---|---|
| Title: | Binary cations minimize energy loss in the wide-band-gap perovskite toward efficient all-perovskite tandem solar cells |
| DOI: | 10.1016/j.joule.2024.07.003 |
| Publisher version: | https://doi.org/10.1016/j.joule.2024.07.003 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | All-perovskite tandem solar cell; wide band-gap perovskite; energy loss; nonradiative recombination; energy-level alignment; surface treatment; passivation; surface dipole; spacer cations; 2D phases |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10202350 |
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