articleJournal of the American Chemical SocietyFeb 24, 2014Closed access

Efficiency Enhancement of Perovskite Solar Cells through Fast Electron Extraction: The Role of Graphene Quantum Dots

ZZZonglong ZhuJMJiani MaZWZilong WangCMCheng MuZFZetan Fan

Hong Kong University of Science and Technology · University of Hong Kong · +1 more institution

PubMed
Indexed incrossrefpubmed

Abstract

We report on a significant power conversion efficiency improvement of perovskite solar cells from 8.81% to 10.15% due to insertion of an ultrathin graphene quantum dots (GQDs) layer between perovskite and TiO2. A strong quenching of perovskite photoluminescence was observed at ∼760 nm upon the addition of the GQDs, which is pronouncedly correlated with the increase of the IPCE and the APCE of the respective cells. From the transient absorption measurements, the improved cell efficiency can be attributed to the much faster electron extraction with the presence of GQDs (90-106 ps) than without their presence (260-307 ps). This work highlights that GQDs can act as a superfast electron tunnel for optoelectronic…

Citation impact

775
total citations
FWCI
53.86
Percentile
100%
References
25
Citations per year

Authors

11

Topics & keywords

Topics
Keywords
  • Perovskite (structure)
  • Quantum dot
  • Graphene
  • Chemistry
  • Energy conversion efficiency
  • Optoelectronics
  • Photoluminescence
  • Quenching (fluorescence)
UN Sustainable Development Goals
  • Affordable and clean energy
No related works found for this paper.

Funding