Binary cations minimize energy loss in the wide-band-gap perovskite toward efficient all-perovskite tandem solar cells

Zhang K, Liu C, Peng Z, Li C, Tian J, Li C, García Cerrillo J, Dong L, Streller F, Späth A, Musiienko A, Englhard J, Li N, Zhang J, Du T, Sathasivam S, Macdonald TJ, These A, Le Corre VM, Forberich K, Meng W, Fink R, Osvet A, Lüer L, Bachmann J, Tong J, Brabec C (2024)

Publication Language: English

Publication Type: Journal article

Publication year: 2024

Journal

DOI: 10.1016/j.joule.2024.07.003

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.

Authors with CRIS profile

Involved external institutions

Wuhan University of Technology China (CN) Helmholtz-Zentrum Berlin für Materialien und Energie (HZB) Germany (DE) University College London (UCL) United Kingdom (GB) Queen Mary University of London United Kingdom (GB)

How to cite

APA:

Zhang, K., Liu, C., Peng, Z., Li, C., Tian, J., Li, C.,... Brabec, C. (2024). Binary cations minimize energy loss in the wide-band-gap perovskite toward efficient all-perovskite tandem solar cells. Joule. https://doi.org/10.1016/j.joule.2024.07.003

MLA:

Zhang, Kaicheng, et al. "Binary cations minimize energy loss in the wide-band-gap perovskite toward efficient all-perovskite tandem solar cells." Joule (2024).

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