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Interfacial Modification Using Hydrogenated TiO2 Electron‐Selective Layers for High‐Efficiency and Light‐Soaking‐Free Organic Solar Cells

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.