Large-area, high-quality self-assembly electron transport layer for organic optoelectronic devices

We propose a self-assembly method for forming large-area high-quality solution-processed titanium oxide (TiO2) films as efficient electron transport layer for organic solar cells. The self-assembled solution-processed TiO2 layers are highly ordered and significantly improved in surface morphology over commonly-used spin-coating process resulting in better charge collection and significant material saving. When incorporated into polymer solar cells, the TiO2 device shows enhanced performance. Furthermore, we demonstrate the TiO2 can form large-area films, and achieve very uniform and improved device performances. Consequently, the self-assembled TiO2 films can be efficient and low-cost electron transport layer potentially for large-area organic optoelectronics.

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► We propose a self-assembly method for forming efficient TiO2 transport layer.
► The self-assembled TiO2 layers are found to be highly uniform.
► The uniform surface leads to enhanced charge collection and device performance.
► The self-assembly method is applicable to large area and maintains good uniformity.
► This method can be potentially applied to low-cost organic optoelectronics.