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Issue 7, 2017
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Optimization of a compact layer of TiO2via atomic-layer deposition for high-performance perovskite solar cells

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Abstract

We report the effect of thickness of a film consisting of a compact layer of TiO2 produced via atomic-layer deposition (ALD) for mesoporous perovskite solar cells (PSCs) with a n-i-p configuration. Uniform and pinhole-free TiO2 films of thickness from 10 to 400 nm were deposited on fluorine-doped tin-oxide substrates using ALD. The device performance of the PSC showed a trend systematic with the thickness of the ALD-TiO2 compact layer and attained the best efficiency, 15.0%, of power conversion at thickness 200 nm. Photoluminescence (PL) spectra and the corresponding PL decays for perovskite (PSK) deposited on varied ALD-TiO2 films were recorded; the effective PL quenching is due to electron transfer from PSK into the ALD-TiO2 compact layer. The most efficient interfacial electron transfer occurred at film thickness 200 nm, for which the ALD-TiO2 film has the greatest surface roughness and conductivity. We found a systematic correlation between the device performance in relation to the conductivity and the rate of interfacial electron transfer as a function of thickness of the ALD-TiO2 film; the best performance occurred at thickness 200 nm. The devices showed great stability and reproducibility, providing an alternative for high-performance PSCs with a well-controlled TiO2 compact layer.

Graphical abstract: Optimization of a compact layer of TiO2via atomic-layer deposition for high-performance perovskite solar cells

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Publication details

The article was received on 25 Apr 2017, accepted on 20 Jun 2017 and first published on 20 Jun 2017


Article type: Paper
DOI: 10.1039/C7SE00220C
Citation: Sustainable Energy Fuels, 2017,1, 1533-1540
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    Optimization of a compact layer of TiO2via atomic-layer deposition for high-performance perovskite solar cells

    A. E. Shalan, S. Narra, T. Oshikiri, K. Ueno, X. Shi, H. Wu, Mahmoud M. Elshanawany, E. Wei-Guang Diau and H. Misawa, Sustainable Energy Fuels, 2017, 1, 1533
    DOI: 10.1039/C7SE00220C

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