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(a) Schematic of the preparation of Co-doped TiO2 particles (BTC: trimesic acid). (b) SEM images of dyesol TiO2 and 1 wt % Co-doped TiO2 paste on FTO-coated glass. (c) current density–voltage (J–V) curves of the best performing PSCs using dyesol TiO2, undoped TiO2, and Co-doped TiO2 (1, 2, and 3 wt %). Reprinted from [118] with permission.
