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Integrated Design of Organic Hole Transport Materials for Efficient Solid‐State Dye‐Sensitized Solar Cells
Author(s) -
Xu Bo,
Tian Haining,
Lin Lili,
Qian Deping,
Chen Hong,
Zhang Jinbao,
Vlachopoulos Nick,
Boschloo Gerrit,
Luo Yi,
Zhang Fengling,
Hagfeldt Anders,
Sun Licheng
Publication year - 2015
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.201401185
Subject(s) - materials science , triphenylamine , crystallinity , energy conversion efficiency , solid state , photosensitizer , electron mobility , optoelectronics , organic solar cell , dye sensitized solar cell , photochemistry , photovoltaic system , nanotechnology , polymer , chemistry , electrode , electrical engineering , electrolyte , composite material , engineering
A series of triphenylamine‐based small molecule organic hole transport materials (HTMs) with low crystallinity and high hole mobility are systematically investigated in solid‐state dye‐sensitized solar cells (ssDSCs). By using the organic dye LEG4 as a photosensitizer, devices with X3 and X35 as the HTMs exhibit desirable power conversion efficiencies (PCEs) of 5.8% and 5.5%, respectively. These values are slightly higher than the PCE of 5.4% obtained by using the state‐of‐the‐art HTM Spiro‐OMeTAD. Meanwhile, transient photovoltage decay measurement is used to gain insight into the complex influences of the HTMs on the performance of devices. The results demonstrate that smaller HTMs induce faster electron recombination in the devices and suggest that the size of a HTM plays a crucial role in device performance, which is reported for the first time.