A Universal Double-Side Passivation for High Open-Circuit Voltage in Perovskite Solar Cells: Role of Carbonyl Groups in Poly(methyl methacrylate)
Khan, Jafar Iqbal
Weber, Klaus J.
Catchpole, Kylie R.
De Wolf, Stefaan
White, Thomas P.
KAUST DepartmentKAUST Catalysis Center (KCC)
KAUST Solar Center (KSC)
Material Science and Engineering Program
Physical Science and Engineering (PSE) Division
Online Publication Date2018-09-14
Print Publication Date2018-10
Embargo End Date2019-09-16
Permanent link to this recordhttp://hdl.handle.net/10754/630529
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AbstractThe performance of state-of-the-art perovskite solar cells is currently limited by defect-induced recombination at interfaces between the perovskite and the electron and hole transport layers. These defects, most likely undercoordinated Pb and halide ions, must either be removed or passivated if cell efficiencies are to approach their theoretical limit. In this work, a universal double-side polymer passivation approach is introduced using ultrathin poly(methyl methacrylate) (PMMA) films. Very high-efficiency (≈20.8%) perovskite cells with some of the highest open circuit voltages (1.22 V) reported for the same 1.6 eV bandgap are demonstrated. Photoluminescence imaging and transient spectroscopic measurements confirm a significant reduction in nonradiative recombination in the passivated cells, consistent with the voltage increase. Analysis of the molecular interactions between perovskite and PMMA reveals that the carbonyl (CO) groups on the PMMA are responsible for the excellent passivation via Lewis-base electronic passivation of Pb2+ ions. This work provides new insights and a compelling explanation of how PMMA passivation works, and suggests future directions for developing improved passivation layers.
CitationPeng J, Khan JI, Liu W, Ugur E, Duong T, et al. (2018) A Universal Double-Side Passivation for High Open-Circuit Voltage in Perovskite Solar Cells: Role of Carbonyl Groups in Poly(methyl methacrylate). Advanced Energy Materials 8: 1801208. Available: http://dx.doi.org/10.1002/aenm.201801208.
SponsorsThis work was supported by the Australian Government through the Australian Renewable Energy Agency (ARENA) and the Australian Research Council. Responsibility for the views, information or advice expressed herein is not accepted by the Australian Government. J.P. acknowledges the funding support from Australian Nanotechnology Network (ANN) and Department of Innovation, Industry, Science and Research (DIISR). The research reported in this publication was supported by funding from King Abdullah University of Science and Technology (KAUST). The authors thank Xavier Pita, scientific illustrator at King Abdullah University of Science and Technology (KAUST), for producing Figure 1a in this paper. J.P. conceived the idea, designed the overall experiments, and led the project. J.P., T.D., H.S., and Y.W. prepared and characterized the perovskite cell devices. J.I.K. and E.U. performed the TA and TRPL measurements and data analysis. F.L. supervised the TA and TRPL measurements and analysis. W.L., X.Y., and J. P. conducted the FTIR measurements and analysis. W.L. performed the DFT calculation. T.D., H.S., and Y.W. conducted the PL imaging measurements. H.D. conducted the XRD and SEM measurements. K.W. conducted the NMR measurements and analysis. E.A. conducted the EQE measurements. J.P., J.I.K., K.J.W., K.R.C., F.L., S.D.W., and T.P.W. contributed to the results analysis and interpretation. T.P.W. and S.D.W. supervised the project. J.P. wrote the manuscript. All authors contributed to the discussion of the results and revision of the manuscript.
JournalAdvanced Energy Materials