Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV18)
DOI: https://doi.org/10.29363/nanoge.hopv.2018.076
Publication date: 21st February 2018
Next generation perovskite solar cells (PSCs) have set themselves apart from their dye-sensitized (DSSC) and organic (OPV) predecessors, with impressive efficiencies approaching 23%.1 While many significant advances in PSC efficiency have come about due to hole transport material (HTM) selection, relatively little is known about charge separation at the perovskite|HTM interface. Our recent work has therefore set out to understand hole transfer as a function of key parameters: (i) the interfacial energy offset, ∆E between the HTM HOMO level and the perovskite valence band; (ii) HTM structure; (iii) the intrinsic properties of the perovskite.
This talk will detail our progress in addressing these objectives using steady-state and time-resolved photoluminescence, as well as transient absorption spectroscopy. Specifically, we will outline our observation of highly efficient (>75%), sub-nanosecond hole transfer to polymeric HTMs at remarkably low values of ∆E (<0.1eV), and suggest that further gains in VOC could be made by incorporating HTMs with deeper-lying HOMOs into PSCs.2 We will also reveal that recombination of injected holes is typically in the millisecond regime in the case of polymeric HTMs, yielding a >105 ratio between interfacial charge-separation/recombination time constants. Finally, we will discuss the importance of the interplay between the structural properties of the perovskite absorber and the HTM.
[1] National Renewable Energy Labs (NREL). Best Research Cell Efficiencies https://www.nrel.gov/pv/assets/images/efficiency-chart. png (accessed 29 Jan, 2018)
[2] R. J. E. Westbrook et al, J. Phys. Chem. C 2018, 122, 1326−1332
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