Toward Antimony Selenide Sensitized Solar Cells: Efficient Charge Photogeneration at <i>spiro</i>-OMeTAD/Sb<sub>2</sub>Se<sub>3</sub>/Metal Oxide Heterojunctions

Abstract

Photovoltaic devices comprising metal chalcogenide nanocrystals as light-harvesting components are emerging as a promising power-generation technology. Here, we report a strategy to evenly deposit Sb<sub>2</sub>Se<sub>3</sub> nanoparticles on mesoporous TiO<sub>2</sub> as confirmed by Raman spectroscopy, energy-dispersive X-ray spectrometry, and transmission electron microscopy. Detailed study of the interfacial charge transfer dynamics by means of transient absorption spectroscopy provides evidence of electron injection across the Sb<sub>2</sub>Se<sub>3</sub>/TiO<sub>2</sub> interface upon illumination, which can be improved 3-fold by annealing at low temperatures. Following addition of the <i>spiro</i>-OMeTAD hole transporting material, regeneration yields exceeding 80% are achieved, and the lifetime of the charge separated species is found to be on the millisecond time scale (τ<sub>50%</sub> ∼ 50 ms). These findings are discussed with respect to the design of solid-state Sb<sub>2</sub>Se<sub>3</sub> sensitized solar cells

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