Journal
NANO ENERGY
Volume 15, Issue -, Pages 125-134Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nanoen.2015.04.016
Keywords
Polymer solar cells; D-A copolymer; Fused-ring acceptor unit; Impedance; Capacitance
Categories
Funding
- 973 Program [2014CB643600, 2014CB643503, 2011CB932304]
- National Natural Science Foundation of China [61405208, U1401244, 21374025]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB12030200]
- CAS/SAFEA International Partnership Program for Creative Research Teams
- 100 Talents Program of Chinese Academy of Sciences
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A highly efficient D-A conjugated polymer (PThTPTI) was applied in inverted organic solar cells. Optimized PThTPTI:PC71BM cells give an outstanding PCE as high as 9.20%, with V-oc of 0.882 V, J(sc) of 14.31 mA/cm(2), FF of 72.9%, and over 72% EQE in the range of 420-640 nm. DIO (1, 8-diiodooctane) effects on device performance are also systematically investigated. The result shows that the addition of DIO produces greatly improved nanoscale morphology of the blend film, which actually does not lead to significantly improved light absorption and build-in potential. Instead it leads to more efficient charge transfer, less carrier recombination, longer effective carrier lifetime and higher carrier mobility, which are the main contributors for the high efficiency. (C) 2015 Elsevier Ltd. All rights reserved.
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