Hydrogenerated black titanium dioxide-embedded conducting polymer for boosting electron flow in perovskite devices

초록

In this study, black titanium dioxide (B–TiO2) nanoparticles were synthesised by the hydrogenation of white anatase TiO2 with the simultaneous formation of oxygen depletion regions. The oxygen deficient regions of B–TiO2 offer additional energy transport states, which accelerate electron extraction. The B–TiO2 nanoparticles were introduced into PC70BM as electron transport layer in an inverted perovskite solar cell. The optimised concentration of B–TiO2 improved the extraction and transport of the electrons, which led to an increased power-conversion efficiency than that of the reference device considered in this study (over 10% enhancement). The role of B–TiO2 in boosting the electron flow within the device has been elucidated using atomic force microscopy, reflectance, photoluminescence spectroscopy, space-charge-limited current mobility, and electrical impedance. Furthermore, the device stability was influenced by the water-repellent property arising from the self-orientation of PC70BM due to the difference in surface energy. © 2020 Elsevier B.V.

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