Structural and spectroscopic studies of a nanostructured silicon-perovskite interface.
Costa, Viviana CP
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Gonzalez-Rodriguez, R., Costa, V. C., Delport, G., Frohna, K., Hoye, R. L., Stranks, S., & Coffer, J. L. (2020). Structural and spectroscopic studies of a nanostructured silicon-perovskite interface.. Nanoscale, 12 (7), 4498-4505. https://doi.org/10.1039/c9nr09622a
While extensively investigated in thin film form for energy materials applications, this work investigates the formation of APbBr3 structures (A = CH3NH3+ (MA), Cs+) in silicon and oxidized silicon nanotubes (SiNTs) with varying inner diameter. We carefully control the extent of oxidation of the nanotube host and correlate the relative Si/Si oxide content in a given nanotube host with the photoluminescence quantum efficiency (PLQE) of the perovskite. Complementing these measurements is an evaluation of average PL lifetimes of a given APbBr3 nanostructure, as evaluated by time-resolved confocal photoluminescence measurements. Increasing Si (decreasing oxide) content in the nanotube host results in a sensitive reduction of MAPbBr3 PLQE, with a concomitant decrease in average lifetime (τave). We interpret these observations in terms of decreased defect passivation by a lower concentration of oxide species surrounding the perovskite. In addition, we show that the use of selected nanotube templates leads to more stable perovskite PL in air over time (weeks). Taken in concert, such fundamental observations have implications for interfacial carrier interactions in tandem Si/perovskite photovoltaics.
This work was supported by the Robert A. Welch Foundation (Grant P-1212 to JLC). This project has also received funding from the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme (grant agreement number 756962). GD would like to acknowledge the Royal Society for funding through a Newton International Fellowship. K. F. acknowledges a George and Lilian Schiff Studentship, Winton Studentship, the Engineering and Physical Sciences Research Council (EPSRC) studentship, Cambridge Trust Scholarship, and Robert Gardiner Scholarship. R. L. Z. H. acknowledges funding from the Royal Academy of Engineering under the Research Fellowships scheme (no.: RF\201718\17101). The authors acknowledge the EPSRC (EP/R023980/1) for funding.
European Commission Horizon 2020 (H2020) ERC (756962)
External DOI: https://doi.org/10.1039/c9nr09622a
This record's URL: https://www.repository.cam.ac.uk/handle/1810/307113
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