Minimizing Interfacial Recombination in 1.8 eV Triple-Halide Perovskites for 27.5% Efficient All-Perovskite Tandems: Article No. 2307743

Fengjiu Yang, Philipp Tockhorn, Artem Musiienko, Felix Lang, Dorothee Menzel, Rowan Macqueen, Eike Kohnen, Ke Xu, Silvia Mariotti, Daniele Mantione, Lena Merten, Alexander Hinderhofer, Bor Li, Dan Wargulski, Steven Harvey, Jiahuan Zhang, Florian Scheler, Sebastian Berwig, Marcel Ross, Jarla ThiesbrummelAmran Al-Ashouri, Kai Brinkmann, Thomas Riedl, Frank Schreiber, Daniel Abou-Ras, Henry Snaith, Dieter Neher, Lars Korte, Martin Stolterfoht, Steve Albrecht

Research output: Contribution to journalArticlepeer-review

7 Scopus Citations

Abstract

All-perovskite tandem solar cells show great potential to enable the highest performance at reasonable costs for a viable market entry in the near future. In particular, wide-bandgap (WBG) perovskites with higher open-circuit voltage (VOC) are essential to further improve the tandem solar cells' performance. Here, a new 1.8 eV bandgap triple-halide perovskite composition in conjunction with a piperazinium iodide (PI) surface treatment is developed. With structural analysis, it is found that the PI modifies the surface through a reduction of excess lead iodide in the perovskite and additionally penetrates the bulk. Constant light-induced magneto-transport measurements are applied to separately resolve charge carrier properties of electrons and holes. These measurements reveal a reduced deep trap state density, and improved steady-state carrier lifetime (factor 2.6) and diffusion lengths (factor 1.6). As a result, WBG PSCs achieve 1.36 V VOC, reaching 90% of the radiative limit. Combined with a 1.26 eV narrow bandgap (NBG) perovskite with a rubidium iodide additive, this enables a tandem cell with a certified scan efficiency of 27.5%.
Original languageAmerican English
Number of pages13
JournalAdvanced Materials
Volume36
Issue number6
DOIs
StatePublished - 2024

NREL Publication Number

  • NREL/JA-5900-88317

Keywords

  • all-perovskite tandem solar cells
  • piperazinium iodide
  • recombination losses
  • triple-halide wide-bandgap perovskite

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