Projects per year
Abstract
To date, the most efficient perovskite solar cells (PSCs) employ an n–i–p device architecture that uses a 2,2′,7,7′-tetrakis(N,N-di-p-methoxyphenyl-amine)-9,9′-spirobifluorene (spiro-OMeTAD) hole-transporting material (HTM), which achieves optimum conductivity with the addition of lithium bis(trifluoromethane)sulfonimide (LiTFSI) and air exposure. However, this additive along with its oxidation process leads to poor reproducibility and is detrimental to stability. Herein, a dicationic salt spiro-OMeTAD(TFSI)2, is employed as an effective p-dopant to achieve power conversion efficiencies of 19.3% and 18.3% (apertures of 0.16 and 1.00 cm2) with excellent reproducibility in the absence of LiTFSI and air exposure. As far as it is known, these are the highest-performing n–i–p PSCs without LiTFSI or air exposure. Comprehensive analysis demonstrates that precise control of the proportion of [spiro-OMeTAD]+ directly provides high conductivity in HTM films with low series resistance, fast hole extraction, and lower interfacial charge recombination. Moreover, the spiro-OMeTAD(TFSI)2-doped devices show improved stability, benefitting from well-retained HTM morphology without forming aggregates or voids when tested under an ambient atmosphere. A facile approach is presented to fabricate highly efficient PSCs by replacing LiTFSI with spiro-OMeTAD(TFSI)2. Furthermore, this study provides an insight into the relationship between device performance and the HTM doping level.
Original language | English |
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Article number | 1901519 |
Number of pages | 10 |
Journal | Advanced Energy Materials |
Volume | 9 |
Issue number | 32 |
DOIs | |
Publication status | Published - 28 Aug 2019 |
Keywords
- high performance
- hole-transporting material
- LiTFSI-free
- p-doping
- perovskite solar cells
Projects
- 2 Finished
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ARC Centre of Excellence in Exciton Science
Mulvaney, P., Ghiggino, K. P., Smith, T. A., Sader, J. E., Wong, W. W. H., Russo, S. P., Cole, J., Jasieniak, J., Funston, A., Bach, U., Cheng, Y., Lakhwani, G., Widmer-Cooper, A., McCamey, D., Schmidt, T., Gomez, D. E., Scholes, F., McCallum, R., Dicinoski, G., Du, C., Plenio, M. B., Tiang, J., Neaton, J., Lippitz, M. & Hao, X.
Monash University – Internal School Contribution, Monash University – Internal Faculty Contribution, Monash University – Internal Department Contribution, Monash University – Internal University Contribution
30/06/17 → 30/06/24
Project: Research
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An X-ray scattering facility for advanced characterisation of natural and novel materials
Wilson, S., Cheng, Y., Davies, C., Guo, Q., Hodgson, P., Hutchinson, C., Kamenetsky, V., Stanford, N. E., Wallace, M., Webb, J., Yang, W. & Zhang, L.
Australian Research Council (ARC), Monash University, Deakin University, La Trobe University, University of Tasmania, University of Melbourne
20/05/13 → 30/04/14
Project: Research
Equipment
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Centre for Electron Microscopy (MCEM)
Flame Sorrell (Manager) & Peter Miller (Manager)
Office of the Vice-Provost (Research and Research Infrastructure)Facility/equipment: Facility
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Melbourne Centre for Nanofabrication
Sean Langelier (Manager)
Office of the Vice-Provost (Research and Research Infrastructure)Facility/equipment: Facility