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Title: Correlation of recombination and open circuit voltage in planar heterojunction perovskite solar cells
Authors: Prochowicz, Daniel
Tavakoli, Mohammad Mahdi
Solanki, Ankur
Goh, Teck Wee
Sum, Tze Chien
Yadav, Pankaj
Keywords: Science::Physics
Issue Date: 2019
Source: Prochowicz, D., Tavakoli, M. M., Solanki, A., Goh, T. W., Sum, T. C., & Yadav, P. (2019). Correlation of recombination and open circuit voltage in planar heterojunction perovskite solar cells. Journal of Materials Chemistry C, 7(5), 1273-1279. doi:10.1039/C8TC05837G
Journal: Journal of Materials Chemistry C
Abstract: Mixed-cation and halide perovskite solar cells have shown superior photovoltaic performance compared to mono-cation based representatives. Their remarkable photovoltaic performance is the effect of superior compositional engineering along with their unique optoelectronic properties. However, there is still a lack of understanding of the working principles of multi-cation based perovskite solar cells. In this study, we employ the state-of-the-art multiple-cation perovskites FA0.83MA0.17Pb(I0.83Br0.17)3 and Cs5(MA0.17FA0.83)95Pb(I0.83Br0.17)3 as absorber layers and investigate their intrinsic and interfacial dynamics in planar TiO2-based PSCs. We demonstrate that the incorporation of Cs+ in FA0.83MA0.17Pb(I0.83Br0.17)3 leads to an increase in power conversion efficiency, improved perovskite phase stability and reduced recombination. However, these devices along with these excellent characteristics still suffer from lower open circuit voltage (Voc) as compared to FA0.83MA0.17Pb(I0.83Br0.17)3 based devices. By analysing the morphological properties and capacitance versus frequency responses, we show that the higher grain size and higher accumulation of photogenerated charges lead to the high open circuit voltage in FA0.83MA0.17Pb(I0.83Br0.17)3 based devices. Our results demonstrate that the values of Voc not only depend on the recombination, but also on charge accumulation phenomena.
ISSN: 2050-7526
DOI: 10.1039/C8TC05837G
Schools: School of Physical and Mathematical Sciences 
Rights: © 2019 The Royal Society of Chemistry. All rights reserved. This paper was published in Journal of Materials Chemistry C and is made available with permission of The Royal Society of Chemistry.
Fulltext Permission: open
Fulltext Availability: With Fulltext
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