Overcoming C60-induced interfacial recombination in inverted perovskite solar cells by electron-transporting carborane

Fangyuan Ye, Shuo Zhang, Jonathan Warby, Jiawei Wu, Emilio Gutierrez-Partida, Felix Lang, Sahil Shah, Elifnaz Saglamkaya, Bowen Sun, Fengshuo Zu, Safa Shoaee, Haifeng Wang, Burkhard Stiller, Dieter Neher, Wei-Hong Zhu, Martin Stolterfoht () and Yongzhen Wu ()
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Fangyuan Ye: East China University of Science & Technology
Shuo Zhang: East China University of Science & Technology
Jonathan Warby: University of Potsdam
Jiawei Wu: East China University of Science & Technology
Emilio Gutierrez-Partida: University of Potsdam
Felix Lang: University of Potsdam
Sahil Shah: University of Potsdam
Elifnaz Saglamkaya: University of Potsdam
Bowen Sun: University of Potsdam
Fengshuo Zu: Humboldt-Universitat zu Berlin, Institut fur Physik & IRIS Adlershof
Safa Shoaee: University of Potsdam
Haifeng Wang: East China University of Science & Technology
Burkhard Stiller: University of Potsdam
Dieter Neher: University of Potsdam
Wei-Hong Zhu: East China University of Science & Technology
Martin Stolterfoht: University of Potsdam
Yongzhen Wu: East China University of Science & Technology

Nature Communications, 2022, vol. 13, issue 1, 1-12

Abstract: Abstract Inverted perovskite solar cells still suffer from significant non-radiative recombination losses at the perovskite surface and across the perovskite/C60 interface, limiting the future development of perovskite-based single- and multi-junction photovoltaics. Therefore, more effective inter- or transport layers are urgently required. To tackle these recombination losses, we introduce ortho-carborane as an interlayer material that has a spherical molecular structure and a three-dimensional aromaticity. Based on a variety of experimental techniques, we show that ortho-carborane decorated with phenylamino groups effectively passivates the perovskite surface and essentially eliminates the non-radiative recombination loss across the perovskite/C60 interface with high thermal stability. We further demonstrate the potential of carborane as an electron transport material, facilitating electron extraction while blocking holes from the interface. The resulting inverted perovskite solar cells deliver a power conversion efficiency of over 23% with a low non-radiative voltage loss of 110 mV, and retain >97% of the initial efficiency after 400 h of maximum power point tracking. Overall, the designed carborane based interlayer simultaneously enables passivation, electron-transport and hole-blocking and paves the way toward more efficient and stable perovskite solar cells.

Date: 2022
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DOI: 10.1038/s41467-022-34203-x

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