Quantum barriers engineering toward radiative and stable perovskite photovoltaic devices
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jats:titleAbstract</jats:title>jats:pEfficient 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.</jats:p>
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Acknowledgements: This work was supported by the National Research Foundation of Korea (NRF) grant funded from the Government of South Korea (NRF-2022M3J1A1085279 and RS-2023-00208467), the Korea Institute of Energy Technology Evaluation and Planning (KETEP) from the Ministry of Trade, Industry & Energy (20214000000680), and the National Research Council of Science & Technology (NST) grant by the Government of South Korea (No. CAP18054-202). This research has been performed as a project NO. KS2422-10 and supported by the Korea Research Institute of Chemical Technology (KRICT). This work was also supported by the EPSRC (EP/S030638/1). S.D.S. acknowledges the Royal Society and Tata Group (UF150033), EPSRC (EP/R023980/1), and the European Research Council under the European Union’s Horizon 2020 research and innovation programme (HYPERION, grant agreement no. 756962). M.A. acknowledges funding from the Leverhulme Early Career Fellowship (grant agreement No. ECF-2019-224) funded by the Leverhulme Trust and the Isaac Newton Trust and from the Royal Academy of Engineering under the Research Fellowship programme.
Funder: the Korea Institute of Energy Technology Evaluation and Planning (KETEP) from the Ministry of Trade, Industry & Energy (20214000000680)
Funder: the Royal Society and Tata Group (UF150033) the European Research Council under the European Union’s Horizon 2020 research and innovation programme (HYPERION, grant agreement no. 756962)
Funder: the Leverhulme Early Career Fellowship (grant agreement No. ECF-2019-224) funded by the Leverhulme Trust and the Isaac Newton Trust and from the Royal Academy of Engineering under the Research Fellowship programme
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National Research Council of Science and Technology (National Research Council of Science & Technology) (No. CAP18054-202)
Korea Research Institute of Chemical Technology (KRICT) (NO. KS2422-10)
RCUK | Engineering and Physical Sciences Research Council (EPSRC) (EP/S030638/1, EP/R023980/1, EP/S030638/1, EP/S030638/1, EP/S030638/1)