Quantum barriers engineering toward radiative and stable perovskite photovoltaic devices

Kyung Mun Yeom, Changsoon Cho, Eui Hyuk Jung, Geunjin Kim, Chan Su Moon, So Yeon Park, Su Hyun Kim, Mun Young Woo, Mohammed Nabaz Taher Khayyat, Wanhee Lee, Nam Joong Jeon, Miguel Anaya, Samuel D. Stranks, Richard H. Friend, Neil C. Greenham () and Jun Hong Noh ()
Additional contact information
Kyung Mun Yeom: Korea University
Changsoon Cho: University of Cambridge
Eui Hyuk Jung: Korea Institute of Energy Technology (KENTECH)
Geunjin Kim: Korea Research Institute of Chemical Technology (KRICT)
Chan Su Moon: Korea University
So Yeon Park: Korea University
Su Hyun Kim: Korea University
Mun Young Woo: Korea University
Mohammed Nabaz Taher Khayyat: Korea University
Wanhee Lee: Pohang University of Science and Technology (POSTECH)
Nam Joong Jeon: Korea Research Institute of Chemical Technology (KRICT)
Miguel Anaya: University of Cambridge
Samuel D. Stranks: University of Cambridge
Richard H. Friend: University of Cambridge
Neil C. Greenham: University of Cambridge
Jun Hong Noh: Korea University

Nature Communications, 2024, vol. 15, issue 1, 1-9

Abstract: Abstract Efficient photovoltaic devices must be efficient light emitters to reach the thermodynamic efficiency limit. Here, we present a promising prospect of perovskite photovoltaics as bright emitters by harnessing the significant benefits of photon recycling, which can be practically achieved by suppressing interfacial quenching. We have achieved radiative and stable perovskite photovoltaic devices by the design of a multiple quantum well structure with long (∼3 nm) organic spacers with oleylammonium molecules at perovskite top interfaces. Our L-site exchange process (L: barrier molecule cation) enables the formation of stable interfacial structures with moderate conductivity despite the thick barriers. Compared to popular short (∼1 nm) Ls, our approach results in enhanced radiation efficiency through the recursive process of photon recycling. This leads to the realization of radiative perovskite photovoltaics with both high photovoltaic efficiency (in-lab 26.0%, certified to 25.2%) and electroluminescence quantum efficiency (19.7 % at peak, 17.8% at 1-sun equivalent condition). Furthermore, the stable crystallinity of oleylammonium-based quantum wells enables our devices to maintain high efficiencies for over 1000 h of operation and >2 years of storage.

Date: 2024
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DOI: 10.1038/s41467-024-48887-w

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