期刊
SYNTHETIC METALS
卷 209, 期 -, 页码 441-446出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.synthmet.2015.08.030
关键词
Polymer solar cell; Cathode buffer layer; Electron collection layer; Zwitterion
资金
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education [2015015683]
A non-conjugated zwitterionic polylectrolyte (PVPy-ZW) based on poly(4-vinylpyridine) is applied to polymer solar cells (PSCs) as a cathode buffer layer either inverted or conventional type polymer solar cells. The Kelvin probe microscopy measurement support the formation of favorable interface dipole at the cathode interface, indicating the reduction of a Schottky barrier for an electron collection from the active layer to the cathode. Inverted type PSC with the PVPy-ZW as a cathode buffer layer demonstrate the power conversion efficiency (PCE) of 3.55% (open circuit voltage (V-oc)= 0.62 V, short circuit current (J(sc)) = 9.49 mA/cm(2), fill factor (FF) = 60.4%), which is better than the device without interlayer (PCE = 2.95%, V-oc = 0.60 V, J(sc) = 8.11 mA/cm(2), FF = 60.6%). This is due to that the reduction of a Schottky barrier at the cathode interface. Conventional type PSC with PVPy-ZW (3.45%) at the cathode interface also exhibit better the PCE compared to that of the device without interlayer (2.88%). Most increase in the PCE of the devices with interlayer is resulted from enhancement of the J(sc). (C) 2015 Elsevier B.V. All rights reserved.
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