Issue 17, 2015

Retarding charge recombination in perovskite solar cells using ultrathin MgO-coated TiO2 nanoparticulate films

Abstract

MgO-coated TiO2 nanoparticle (NP)-based electron collecting layers were fabricated to prevent charge recombination at the methylamine lead iodide/TiO2 interface in perovskite solar cells. The open circuit voltage (Voc) and fill factor (ff) of perovskite solar cells based on MgO-coated TiO2 charge collectors were 0.89 V and 71.2%, respectively. These values were 4.7% and 6.1% higher than the pure TiO2 based perovskite solar cells. Transient photovoltage decay data exhibited recombination times for MgO-coated TiO2 NP-based perovskite solar cells about three times longer than those of TiO2 NP based solar cells. The longer recombination time was responsible for enhancing the Voc and ff of MgO-coated TiO2 NP-based perovskite solar cells. By employing a MgO nanolayer, we observed that the power conversion efficiency (PCE) was increased from 11.4% to 12.7%, demonstrating that MgO ultrathin nanolayers are able to efficiently retard charge recombination in perovskite solar cells.

Graphical abstract: Retarding charge recombination in perovskite solar cells using ultrathin MgO-coated TiO2 nanoparticulate films

Supplementary files

Article information

Article type
Paper
Submitted
18 Шіл. 2014
Accepted
24 Қыр. 2014
First published
24 Қыр. 2014

J. Mater. Chem. A, 2015,3, 9160-9164

Author version available

Retarding charge recombination in perovskite solar cells using ultrathin MgO-coated TiO2 nanoparticulate films

G. S. Han, H. S. Chung, B. J. Kim, D. H. Kim, J. W. Lee, B. S. Swain, K. Mahmood, J. S. Yoo, N. Park, J. H. Lee and H. S. Jung, J. Mater. Chem. A, 2015, 3, 9160 DOI: 10.1039/C4TA03684K

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