Unveiling the Influence of pH on the Crystallization of Hybrid Perovskites, Delivering Low Voltage Loss Photovoltaics
File(s)
Accepted version
Supporting information
Author(s)
Type
Journal Article
Abstract
Impressive power conversion efficiencies coupled with the relative ease of
fabrication have made perovskite solar cells a front runner for next-generation photovoltaics.
Although perovskite films and optoelectronic devices have been widely
studied, relatively little is known about the chemistry of the precursor solutions.
Here, we present a study on the hydrolysis of N,N-dimethylformamide, correlating
how pH changes related to its degradation affect the crystallization of MAPbI3 xClx
perovskite films. By careful manipulation of the pH, and the resulting colloid
distribution in precursor solutions, we fabricate perovskite films with greatly
improved crystallinity, which when incorporated into photovoltaic devices reproducibly
yield efficiencies of over 18%. Extending this method to the mixed cation,
mixed halide perovskite FA0.83MA0.17Pb(I0.83Br0.17)3, we obtain power conversion
efficiencies of up to 19.9% and open-circuit voltages of 1.21 V for a material with
a bandgap of 1.57 eV, achieving the lowest yet reported loss in potential from
bandgap to a VOC of only 360 mV.
fabrication have made perovskite solar cells a front runner for next-generation photovoltaics.
Although perovskite films and optoelectronic devices have been widely
studied, relatively little is known about the chemistry of the precursor solutions.
Here, we present a study on the hydrolysis of N,N-dimethylformamide, correlating
how pH changes related to its degradation affect the crystallization of MAPbI3 xClx
perovskite films. By careful manipulation of the pH, and the resulting colloid
distribution in precursor solutions, we fabricate perovskite films with greatly
improved crystallinity, which when incorporated into photovoltaic devices reproducibly
yield efficiencies of over 18%. Extending this method to the mixed cation,
mixed halide perovskite FA0.83MA0.17Pb(I0.83Br0.17)3, we obtain power conversion
efficiencies of up to 19.9% and open-circuit voltages of 1.21 V for a material with
a bandgap of 1.57 eV, achieving the lowest yet reported loss in potential from
bandgap to a VOC of only 360 mV.
Date Issued
2017-10-11
Date Acceptance
2017-10-11
Citation
Joule, 2017, 1 (2), pp.328-343
ISSN
2542-4351
Publisher
Elsevier
Start Page
328
End Page
343
Journal / Book Title
Joule
Volume
1
Issue
2
Copyright Statement
© 2017, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/
Publication Status
Published