Effect of counter-ions on the properties and performance of non-conjugated polyelectrolyte interlayers in solar cell and transistor devices |
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| Authors: | Ju Hwan Kang Yu Jung Park Myung Joo Cha Yeonjin Yi Aeran Song Kwun-Bum Chung Jung Hwa Seo Bright Walker |
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| Affiliation: | Department of Materials Physics, Dong-A University, 49315 Republic of Korea.; Institute of Physics and Applied Physics, Yonsei University, Seoul 03722 Republic of Korea ; Division of Physics and Semiconductor Science, Dongguk University, Seoul 04620 Republic of Korea ; Department of Chemistry, Kyung Hee University, 02453 Seoul Republic of Korea, |
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| Abstract: | ![]()
We have investigated a series of non-conjugated polyelectrolytes (NPEs) which are based on a polyethylenimine (PEI) backbone with various counterions, such as Br− I− and BIm4−, as interfacial layers at the electrodes of solar cells and transistor devices to improve the power conversion efficiency (PCE) and device performance. This new series of NPEs with different counterions are capable of forming electric dipoles at NPE/metal electrode interfaces; as a consequence tuning of the energy levels, and work function (WF) of the electrodes is possible. Using this approach, the PCE of organic solar cells could be improved from 1.05% (without NPEs) to 6.77% (with NPEs) while the charge carrier mobility and on/off ratio of FET devices could be improved, showing the broad utility of this type of material. This study provides a novel approach towards investigating the influence of ions on interfacial dipoles and electrode WFs in solution-processed semiconducting devices.Non-conjugated polyelectrolytes are empolyed as interfacial layers at the electrodes of solar cells and transistor devices to improve the power conversion efficiency (PCE) and device performance. |
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