Journal
ADVANCED ENERGY MATERIALS
Volume 8, Issue 6, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201602773
Keywords
ethylenedioxythiophene (EDOT); fluorination; polymer solar cells; side chain engineering; wide bandgap copolymers
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Funding
- NSFC [51573107, 91633301, 21432005]
- Youth Science and Technology Foundation of Sichuan Province [2013JQ0032]
- Foundation of State Key Laboratory of Polymer Materials Engineering [sklpme2017-2-04]
- Synergistic Innovation Joint Foundation of CAEP-SCU [XTCX2014008]
- Fundamental Research Funds for the Central Universities [2012SCU04B01, YJ2011025]
- Hong Kong Innovation and Technology Commission [ITC-CNERC14SC01]
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Newly developed benzo[1,2-b:4,5-b]dithiophene (BDT) block with 3,4-ethylenedioxythiophene (EDOT) side chains is first employed to build efficient photovoltaic copolymers. The resulting copolymers, PBDTEDOT-BT and PBDTEDOTFBT, have a large bandgap more than 1.80 eV, which is attributed to the increased steric hindrance between the BDT and EDOT skeletons. Both copolymers possess the satisfied absorptions, low-lying highest occupied molecular orbital (HOMO) levels and high crystallinity. Using the fluorination strategy, PBDTEDOT-FBT exhibits a wider and stronger absorption and a deeper HOMO level than those of PBDTEDOT-BT. PBDTEDOT-FBT:[6,6]-Phenyl C-71 butyric acid methyl ester (PC71BM) blend also shows the higher hole mobility and better surface morphology compared with the PBDTEDOTBT:PC71BM blend. Combination of above advantages, PBDTEDOT-FBT devices exhibit much higher power conversion efficiency (PCE) of 10.11%, with an improved open circuit voltage (V-oc) of 0.86 V, short circuit current densities (J(sc)) of 16.01 mA cm(-2), and fill factor (FF) of 72.6%. This work not only provides a newly efficient candidate of BDT donor block modified with EDOT conjugated side chains, but also achieves high-performance large bandgap copolymers for polymer solar cells (PSCs) via the synergistic effect of fluorination and side chain engineering strategies.
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