In this work we study the ultrafast exciton dynamics in CdTe nanorods by using two-dimensional electronic spectroscopy (2DES). By simultaneously exciting the lowest three excitonic transitions (i.e. S1, S2 and S3) we extract the electron and hole relaxation pathways, owing to the combined temporal and spectral resolution of 2DES. In particular, we directly observe hot hole relaxation from the second to the first exciton state in about 30 fs by excitation of the S2 transition. Additionally, we extract a direct charge relaxation to S1 by disentangling the overlapping bleach and excited state induced energy level shifts after excitation of S3.
Tatjana Stoll, Federico Branchi, Julien Rehault, Ilka Kriegel, Francesco Scotognella, Francesco Tassone, and Giulio Cerullo, "Unraveling electron and hole relaxation dynamics in colloidal CdTe nanorods: a two-dimensional electronic spectroscopy study," Proc. SPIE 10102, Ultrafast Phenomena and Nanophotonics XXI, 1010213 (Presented at SPIE OPTO: February 01, 2017; Published: 23 February 2017); https://doi.org/10.1117/12.2252329.
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Study of self-shadowing effect as a simple means to realize nanostructured thin films and layers with special attentions to birefringent obliquely deposited thin films and photo-luminescent porous silicon