Journal
ADVANCED ENERGY MATERIALS
Volume 8, Issue 14, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201703064
Keywords
atmospheric pressure plasma in liquid; electron-selective layers; hydrogenated TiO2; light soaking; organic solar cells
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Funding
- Basic Science Research Program through National Research Foundation of Korea - Ministry of Science, ICT, and Future Planning [NRF-2016R1C1B2014644]
- Pioneer Research Center Program through the National Research Foundation of Korea - Ministry of Science, ICT, and Future Planning [NRF-2016R1C1B2014644]
- Energy Technology Development Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant - Korean government [20163010012570]
- R&D Program of Plasma Convergence and Fundamental Research through the National Fusion Research Institute of Korea (NFRI)
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Optimizing the interfacial contacts between the photoactive layer and the electrodes is an important factor in determining the performance of organic solar cells (OSCs). A charge-selective layer with tailored electrical properties enhances the charge collection efficiency and interfacial stability. Here, the potential of hydrogenated TiO2 nanoparticles (H-TiO2 NPs) as an efficient electron-selective layer (ESL) material in OSCs is reported for the first time. The H-TiO2 is synthesized by discharge plasma in liquid at atmospheric pressure, which has the benefits of a simple one-pot synthesis process, rapid and mild reaction conditions, and the capacity for mass production. The H-TiO2 exhibits high conductivity and favorable energy level formation for efficient electron extraction, providing a basis for an efficient bilayer ESL system composed of conjugated polyelectrolyte/H-TiO2. Thus, the enhanced charge transport and extraction efficiency with reduced recombination losses at the cathode interfacial contacts is achieved. Moreover, the OSCs composed of H-TiO2 are almost free of light soaking, which has been reported to severely limit the performance and stability of OSCs based on conventional TiO2 ESLs. Therefore, H-TiO2 as a new efficient, stable, and cost-effective ESL material has the potential to open new opportunities for optoelectronic devices.
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