Issue 7, 2017

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

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

Associated articles

Supplementary files

Article information

Article type
Paper
Submitted
25 Apr. 2017
Accepted
20 Jūn. 2017
First published
20 Jūn. 2017
This article is Open Access
Creative Commons BY-NC license

Sustainable Energy Fuels, 2017,1, 1533-1540

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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