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Unveiling the Influence of pH on the Crystallization of Hybrid Perovskites, Delivering Low Voltage Loss Photovoltaics

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Title: Unveiling the Influence of pH on the Crystallization of Hybrid Perovskites, Delivering Low Voltage Loss Photovoltaics
Authors: Noel, NK
Congiu, M
Ramadan, AJ
Fearn, S
McKeekin, DP
Patel, JB
Johnston, MB
Wenger, B
Snaith, HJ
Item 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.
Issue Date: 11-Oct-2017
Date of Acceptance: 11-Oct-2017
URI: http://hdl.handle.net/10044/1/51916
DOI: https://dx.doi.org/10.1016/j.joule.2017.09.009
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
Appears in Collections:Materials
Faculty of Engineering