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SrTiO 3 /Al 2 O 3 ‐Graphene Electron Transport Layer for Highly Stable and Efficient Composites‐Based Perovskite Solar Cells with 20.6% Efficiency
Author(s) -
Mahmoudi Tahmineh,
Wang Yousheng,
Hahn YoonBong
Publication year - 2020
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201903369
Subject(s) - materials science , graphene , perovskite (structure) , energy conversion efficiency , oxide , mesoporous material , photovoltaic system , electron mobility , chemical engineering , composite material , nanotechnology , optoelectronics , catalysis , biochemistry , chemistry , engineering , metallurgy , ecology , biology
For practical use of perovskite solar cells (PSCs) the instability issues of devices, attributed to degradation of perovskite molecules by moisture, ions migration, and thermal‐ and light‐instability, have to be solved. Herein, highly efficient and stable PSCs based on perovskite/Ag‐reduced graphene oxide (Ag‐rGO) and mesoporous Al 2 O 3 /graphene (mp‐AG) composites are reported. The mp‐AG composite is conductive with one‐order of magnitude higher mobility than mp‐TiO 2 and used for electron transport layer (ETL). Compared to the mp‐TiO 2 ETL based cells, the champion device based on perovskite/Ag‐rGO and SrTiO 3 /mp‐AG composites shows overall a best performance (i.e., V OC = 1.057 V, J SC = 25.75 mA cm −2 , fill factor (FF) = 75.63%, and power conversion efficiency (PCE) = 20.58%). More importantly, the champion device without encapsulation exhibits not only remarkable thermal‐ and photostability but also long‐term stability, retaining 97–99% of the initial values of photovoltaic parameters and sustaining ≈93% of initial PCE over 300 d under ambient conditions.