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- Title
Quantum barriers engineering toward radiative and stable perovskite photovoltaic devices.
- Authors
Yeom, Kyung Mun; Cho, Changsoon; Jung, Eui Hyuk; Kim, Geunjin; Moon, Chan Su; Park, So Yeon; Kim, Su Hyun; Woo, Mun Young; Khayyat, Mohammed Nabaz Taher; Lee, Wanhee; Jeon, Nam Joong; Anaya, Miguel; Stranks, Samuel D.; Friend, Richard H.; Greenham, Neil C.; Noh, Jun Hong
- 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. Efficient radiation is essential to reach thermodynamic limit of photovoltaic efficiency. Here, authors design thick quantum barriers to suppress interfacial quenching and boost photon recycling in perovskite cells, achieving high radiation and photovoltaic efficiencies and long device stability.
- Subjects
PEROVSKITE; MAXIMUM power point trackers; LIGHT emitting diodes; ELECTRON transport; QUANTUM wells; INTERFACIAL friction; QUANTUM efficiency
- Publication
Nature Communications, 2024, Vol 15, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-024-48887-w