Exciton relaxation pathways in CdSe nanorods revealed by two-dimensional electronic spectroscopy

Franco V.A. Camargo, Tetsuhiko Nagahara, Yuval Ben-Shahar, Mattia Russo, Uri Banin, Giulio Cerullo

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Colloidal semiconductor quantum dots (QDs) are promising for solar energy harvesting, particularly the excess energy of hot and/or high energy excitons before they relax, which would allow efficiencies beyond the Shockley-Queisser limit. Going beyond QDs, nanostructured materials such as nanorods (NRs) are attracting significant attention, as their geometrical differences with QDs imply different electronic properties, and their one-dimensional character makes them ideal building blocks for hybrid nanostructures [1,2]. Experimental observation of the charge relaxation pathways in such nanostructured systems is challenging, as high resolution in time (to resolve ultrafast processes) and in excitation energy (to distinguish the relaxation pathways of different excitons) are simultaneously required, which are incompatible with regular transient absorption (TA). Both requirements are met by two-dimensional electronic spectroscopy (2DES), which can be thought as an extension of TA employing two phase-locked pump pulses. Acquiring the data as a function of the delay t1 between them and using Fourier transform spectroscopy yields a correlation map between signal excitation and signal emission energies for each waiting time t2 [3]. As it provides resolution in the excitation energy, 2DES is ideal to study systems with spectrally congested electronic transitions and was applied to study many nanostructured systems [4].

Original languageAmerican English
Title of host publication2019 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2019
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781728104690
DOIs
StatePublished - Jun 2019
Event2019 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2019 - Munich, Germany
Duration: 23 Jun 201927 Jun 2019

Publication series

Name2019 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2019

Conference

Conference2019 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2019
Country/TerritoryGermany
CityMunich
Period23/06/1927/06/19

Bibliographical note

Publisher Copyright:
© 2019 IEEE.

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