Journal
CHEMISTRY-AN ASIAN JOURNAL
Volume 11, Issue 7, Pages 1043-1049Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/asia.201501423
Keywords
energy conversion; hole-transporting materials; organic electronics; perovskite solar cells; sulfur heterocycles
Categories
Funding
- National Natural Science Foundation of China [21102187, 91433109]
- Natural Science Foundation of Guangdong Province [S2013010012128, S2013030013474]
- Science and Technology Planning Project of Guangdong Province [2015A010105013]
- Science and Technology Planning Project of Guangzhou City [201504291110274, 201504010031]
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Two new electron-rich molecules based on 3,4-phenylenedioxythiophene (PheDOT) were synthesized and successfully adopted as hole-transporting materials (HTMs) in perovskite solar cells (PSCs). X-ray diffraction, absorption spectra, photoluminescence spectra, electrochemical properties, thermal stabilities, hole mobilities, conductivities, and photovoltaic parameters of PSCs based on these two HTMs were compared with each other. By introducing methoxy substituents into the main skeleton, the energy levels of PheDOT-core HTM were tuned to match with the perovskite, and its hole mobility was also improved (1.33x10(-4)cm(2)V(-1)s(-1), being higher than that of spiro-OMeTAD, 2.34x10(-5)cm(2)V(-1)s(-1)). The PSC based on MeO-PheDOT as HTM exhibits a short-circuit current density (J(sc)) of 18.31mAcm(-2), an open-circuit potential (V-oc) of 0.914V, and a fill factor (FF) of 0.636, yielding an encouraging power conversion efficiency (PCE) of 10.64% under AM1.5G illumination. These results give some insight into how the molecular structures of HTMs affect their performances and pave the way for developing high-efficiency and low-cost HTMs for PSCs.
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