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Titanate Hollow Nanospheres as Electron-transport Layer in Mesoscopic Perovskite Solar Cell with Enhanced Performance

Abstract

Nanostructured inorganic oxide semiconductor, working as an electron-transport layer (ETL), affects greatly the power conversion efficiency (PCE) of organometal-halide perovskite solar cell. In this study, titanate hollow nanospheres synthesized by a simple process containing a cation-exchanging step have been explored as ETLs for mesoscopic perovskite solar cells. Zn2+, Ba2+ and H+ were induced to tune the properties of titanate spheres, and thus the PCE. The conductivity, optical band gap, valence band and conduction band of hollow nanospheres varied significantly with different cations. The optimized devices based on Ti-Zn-O hollow nanospheres presented a PCE of 17% (average efficiency of 16.39%), outperforming the devices with the pristine TiO2 spheres (15.87%, average efficiency of 15.08%) and Ti-Ba-O hollow nanospheres (4.88%). The impedance spectroscopy measurements revealed that the enhancement in PCE was ascribed to the improved carrier transport properties, and the better band matching with the perovskite layer resulting from introduction of Zn2+ cations into the TiO2 matrix. This work sheds light on the developing high-quality inorganic ETL materials for perovskite-based photovoltaic devices.

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Publication details

The article was received on 10 Dec 2018, accepted on 10 Jan 2019 and first published on 10 Jan 2019


Article type: Paper
DOI: 10.1039/C8TC06218H
Citation: J. Mater. Chem. C, 2019, Accepted Manuscript
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    Titanate Hollow Nanospheres as Electron-transport Layer in Mesoscopic Perovskite Solar Cell with Enhanced Performance

    H. Wang, R. Jiang, M. Sun, X. Yin, Y. Guo, M. He and L. Wang, J. Mater. Chem. C, 2019, Accepted Manuscript , DOI: 10.1039/C8TC06218H

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