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Low-temperature solution-processed efficient electron-transporting layers based on BF4--capped TiO2 nanorods for high-performance planar perovskite solar cells

Abstract

In order to fabricate cost-effective solar cells, some prerequisites such as low-energy consumption, easily technological processes and high efficiency must be achieved. The methodology of low-temperature solution-processed planar perovskite solar cells (PSCs) is desirable for achieving the aims. Although TiO2 is the most widely used material in preparing electron-transporting layers (ETLs) of PSCs, it usually needs high-temperature sintering process to enhance electron mobility, which is not only energy consumption but also unsuitable for polymer based flexible substrates. Here, we propose a novel strategy to solve the problem. We use the sophisticated solvothermal method with the aid of oleic acid (OA) ligands to synthesize high aspect ratio and well crystalline TiO2 nanorods. And then, the ligand-exchange treatment is applied to substitute the insulating OA ligands with BF4- ions. These measures are very beneficial for low-temperature solution-processed high-quality TiO2 ETLs with highly electrical conductivity, fast electron extracting and transporting rates. Finally, the PSC with BF4--capped TiO2 nanorod ETL achieves a high power conversion efficiency of 18.76% and good reproducibility. This work offers a feasible way to achieve high-efficiency low-temperature solution-processed planar PSCs.

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Publication details

The article was received on 27 Oct 2017, accepted on 04 Dec 2017 and first published on 05 Dec 2017


Article type: Paper
DOI: 10.1039/C7TC04899H
Citation: J. Mater. Chem. C, 2017, Accepted Manuscript
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    Low-temperature solution-processed efficient electron-transporting layers based on BF4--capped TiO2 nanorods for high-performance planar perovskite solar cells

    L. Zhang, X. xu, X. zhang, J. Tang, L. Zhang, X. He and J. Wu, J. Mater. Chem. C, 2017, Accepted Manuscript , DOI: 10.1039/C7TC04899H

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