Journal
ORGANIC ELECTRONICS
Volume 42, Issue -, Pages 387-392Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.orgel.2016.12.011
Keywords
Conventional polymer solar cells; Ionic liquids; Cathode interlayer; Mobility
Funding
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB01020300]
- National Natural Science Foundation of China [61604152]
- Thousand Talents Program for Young Scholars of China
- Collaborative Innovation Center of Chemistry for Energy Materials (iChEM)
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Interfacial layer materials have been demonstrated to be crucial for high-efficiency polymer solar cells (PSCs). In this work, we use ionic liquid (IL) as cathode interfacial layer (CIL) for highly efficient conventional PSCs (c-PSCs) and investigate functions of ILs with different cations and substituents. Employing IL as the CIL, PBDITT-C:PC71BM-based c-PSC affords a power conversion efficiency (PCE) of 7.29%, much higher than that without the CIL (2.78%) and that with Ca/Al electrode (6.18%). When the photoactive layer is a PTB7-Th:PC71BM blend, a higher PCE of 8.67% can be obtained. The Its reduce the energy barrier due to the existence of interfacial dipole in c-PSCs, leading to increased electron and hole mobilities, reduced series resistance and enhanced contact at the cathode interface. Meanwhile, alkyl chain-substituted ILs offer higher fill factor and PCE than aromatic groups-substituted analogue, which is mainly contributed to more balanced electron and hole mobilities. This work suggests that the ILs are qualified candidates as the CIL for c-PSCs and that one should take the substitution effect into account when choosing a CIL from a large library of materials. (C) 2016 Published by Elsevier B.V.
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