Ultrafast Tracking of Exciton and Charge Carrier Transport in Optoelectronic Materials on the Nanometer Scale.
Verma, Sachin Dev
Chen, Richard YS
The journal of physical chemistry letters
American Chemical Society
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Schnedermann, C., Sung, J., Pandya, R., Verma, S. D., Chen, R. Y., Gauriot, N., Bretscher, H. M., et al. (2019). Ultrafast Tracking of Exciton and Charge Carrier Transport in Optoelectronic Materials on the Nanometer Scale.. The journal of physical chemistry letters, 10 (21), 6727-6733. https://doi.org/10.1021/acs.jpclett.9b02437
We present a novel optical transient absorption and reflection microscope based on a diffraction-limited pump pulse in combination with a wide-field probe pulse, for the spatio-temporal investigation of ultrafast population transport in thin films. The microscope achieves a temporal resolution down to 12 fs and simultaneously provides sub-10 nm spatial accuracy. We demonstrate the capabilities of the microscope by revealing an ultrafast excited-state exciton population transport of up to 32 nm in a thin film of pentacene and by tracking the carrier motion in p-doped silicon. The use of few-cycle optical excitation pulses enables impulsive stimulated Raman micro-spectroscopy, which is used for in-situ verification of the chemical identity in the 100 – 2000 cm-1 spectral window. Our methodology bridges the gap between optical microscopy and spectroscopy allowing for the study of ultrafast transport properties down to the nanometer length scale.
We acknowledge financial support from the EPSRC and the Winton Program for the Physics of Sustainability. This project has received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (grant agreement No 758826). C.S. acknowledges financial support by the Royal Commission of the Exhibition of 1851.
Royal Commission for the Exhibition of 1851 (RF499/2018)
European Commission Horizon 2020 (H2020) ERC (758826)
European Commission Horizon 2020 (H2020) Marie Sk?odowska-Curie actions (748050)
External DOI: https://doi.org/10.1021/acs.jpclett.9b02437
This record's URL: https://www.repository.cam.ac.uk/handle/1810/297738
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