標題: Optimization of a compact layer of TiO2 via atomic-layer deposition for high-performance perovskite solar cells
作者: Shalan, Ahmed Esmail
Narra, Sudhakar
Oshikiri, Tomoya
Ueno, Kosei
Shi, Xu
Wu, Hui-Ping
Elshanawany, Mahmoud M.
Diau, Eric Wei-Guang
Misawa, Hiroaki
應用化學系
Department of Applied Chemistry
公開日期: 1-Sep-2017
摘要: 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.
URI: http://dx.doi.org/10.1039/c7se00220c
http://hdl.handle.net/11536/144378
ISSN: 2398-4902
DOI: 10.1039/c7se00220c
期刊: SUSTAINABLE ENERGY & FUELS
Volume: 1
起始頁: 1533
結束頁: 1540
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