Quantum Barriers Engineering Toward Radiative and Stable Perovskite Photovoltaic Devices: Article No. 4547

Kyung Yeom, Changsoon Cho, Eui Jung, Geunjin Kim, Chan Moon, So Yeon Park, Su Kim, Mun Woo, Mohammed Khayyat, Wanhee Lee, Nam Jeon, Miguel Anaya, Samuel Stranks, Richard Friend, Neil Greenham, Jun Noh

Research output: Contribution to journalArticlepeer-review

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.
Original languageAmerican English
Number of pages9
JournalNature Communications
Volume15
DOIs
StatePublished - 2024

NREL Publication Number

  • NREL/JA-5900-90295

Keywords

  • perovskites
  • photon recycling
  • photovoltaic devices
  • quantum barriers engineering

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