Citation: Ping Fu, Xin Guo, Can Li. Ionic Liquids Containing Different Halogen Anions as Cathode Interlayer for Inverted Polymer Solar Cells[J]. Acta Polymerica Sinica, ;2018, (2): 266-272. doi: 10.11777/j.issn1000-3304.2018.17234 shu

Ionic Liquids Containing Different Halogen Anions as Cathode Interlayer for Inverted Polymer Solar Cells

Ping Fu ,
Xin Guo ^, ,
Can Li ^,

Dalian National Laboratory for Clean Energy/State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023

Corresponding author: Xin Guo, guoxin@dicp.ac.cn Can Li, canli@dicp.ac.cn
Received Date: 22 August 2017
Revised Date: 19 September 2017

Bulk-heterojunction polymer solar cells (PSCs) have attracted great research attention owing to their advantages of low cost, light weight, and their feasibility to fabricate flexible devices. Power conversion efficiency (PCEs) exceeding 12% for single-junction invertedpolymer solar cells (IPSCs) has been reported in the last years. Fast advancement of PCE benefits mainly from new materials synthesized, morphology optimization of active layer and interfacial engineering. Especially, the interfacial engineering has drawn great attention in recent years. To fabricate efficient IPSCs, a cathode interlayer (CIL) is usually needed between the ITO cathode and the photoactive layer to reduce the work function (WF) of the ITO cathode and to lower the energy barriersfor efficient charge-transfer due to an energy-level mismatch between the high WF of ITO cathode and the lowest unoccupied molecular orbital (LUMO) level of fullerene acceptor. In this work, we employed ionic liquids with different halogen anions as CILs for efficient IPSCs, and explored the influence of such halogen anions on the PCE of the IPSCs. A PCE of 6.55% was achieved for the IPSCs with ionic liquids as the CIL and PBDTTT-C:PC₇₁BM as the active layer, much higher than those without the CIL. When using the PTB7-Th:PC₇₁BM as the active layer, a higher PCE of 8.24% was obtained. Ionic liquids could effectively reduce the contact barrier and the series resistance between the ITO cathode and the active layer due to the interfacial dipole, and thus improving the PCE of the IPSCs. Meanwhile, it was found that the IPSC with iodide ionic liquid ([BzMIM]Ⅰ) as the CIL could afford a higher PCE than that with bromide or chloride ionic liquids ([BzMIM]Cl, [BzMIM]Br), mainly attributing to the greater decreases of the ITO work function and the contact resistance in the case with the former ([BzMIM]Ⅰ) as the CIL.
- Polymer solar cells,
- Cathode interlayer,
- Ionic liquids,
- Halogen anion
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