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Graphene–Perovskite Solar Cells Exceed 18 % Efficiency: A Stability Study
Author(s) -
Agresti Antonio,
Pescetelli Sara,
Taheri Babak,
Del Rio Castillo Antonio Esaù,
Cinà Lucio,
Bonaccorso Francesco,
Di Carlo Aldo
Publication year - 2016
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201600942
Subject(s) - graphene , materials science , exfoliation joint , perovskite (structure) , energy conversion efficiency , mesoporous material , graphite , doping , oxide , chemical engineering , nanotechnology , optoelectronics , composite material , catalysis , chemistry , organic chemistry , engineering , metallurgy
Interface engineering is performed by the addition of graphene and related 2 D materials (GRMs) into perovskite solar cells (PSCs), leading to improvements in the power conversion efficiency (PCE). By doping the mesoporous TiO 2 layer with graphene flakes (mTiO 2 +G), produced by liquid‐phase exfoliation of pristine graphite, and by inserting graphene oxide (GO) as an interlayer between the perovskite and hole‐transport layers, using a two‐step deposition procedure in air, we achieved a PCE of 18.2 %. The obtained PCE value mainly results from improved charge‐carrier injection/collection with respect to conventional PSCs. Although the addition of GRMs does not influence the shelf life, it is beneficial for the stability of PSCs under several aging conditions. In particular, mTiO 2 +G PSCs retain more than 88 % of the initial PCE after 16 h of prolonged 1 sun illumination at the maximum power point. Moreover, when subjected to prolonged heating at 60 °C, the GO‐based structures show enhanced stability with respect to mTiO 2 +G PSCs, as a result of thermally induced modification at the mTiO 2 +G/perovskite interface. The exploitation of GRMs in the form of dispersions and inks opens the way for scalable large‐area production, advancing the possible commercialization of PSCs.