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Composite Hole‐Transport Materials Based on a Metal‐Organic Copper Complex and Spiro‐OMeTAD for Efficient Perovskite Solar Cells
Author(s) -
Hua Yong,
Liu Peng,
Li Yuanyuan,
Sun Licheng,
Kloo Lars
Publication year - 2018
Publication title -
solar rrl
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.544
H-Index - 37
ISSN - 2367-198X
DOI - 10.1002/solr.201700073
Subject(s) - perovskite (structure) , composite number , materials science , copper , metal , electron mobility , chemical engineering , optoelectronics , nanotechnology , composite material , metallurgy , engineering
Spiro‐OMeTAD has been the most commonly used hole‐transport material in perovskite solar cells. However, this material shows intrinisic drawbacks, such as low hole mobility and conductivity in its pristine form, as well as self‐aggregation when deposited as thin film. These are not beneficial properties for efficient hole transport and extraction. In order to address these issues, we have designed a new type of composite hole‐transport materials based on a new metal‐organic copper complex (CuH) and Spiro‐OMeTAD. The incorporation of the molecularly bulky HTM CuH into the Spiro‐OMeTAD material efficiently improves the hole mobility and suppresses the aggregation in the Spiro‐OMeTAD film. As a result, the conversion efficiencies obtained for perovskite solar cells based on the composite HTM system reached as high as 18.83%, which is superior to solar cells based on the individual hole‐transport materials CuH (15.75%) or Spiro‐OMeTAD (14.47%) under the same working conditions. These results show that composite HTM systems may constitute an effective strategy to further improve the efficiency of perovskite solar cells.