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HL: Fachverband Halbleiterphysik

HL 71: Quantum Dots and Wires: Optical Properties

HL 71.1: Talk

Thursday, March 10, 2016, 09:30–09:45, H15

Exciton dynamics in colloidal CdSe nanoplatelets — •Sebastian Kickhöfel¹, Riccardo Scott¹, Artisom Antanovich², Anatol Prudnikau², Mikhail Artemyev², Alexander Achtstein¹, and Ulrike Woggon¹ — ¹Institute of Optics and Atomic Physics, Technical University of Berlin, 10623 Berlin, Germany — ²Institute for Physicochemical Problems, Belarusian State University, 220030 Minsk, Belarus

Colloidal nanoplatelets are an active field of optoelectronic research. They combine advantages of colloidal systems like quantum dots and strongly confined 2D semiconductor quantum wells. Their optical absorption and emission can be tailored in a wide range^[1]. As there is an increased number of reports showing unique optoelectronic properties like low lasing thresholds and strong electrooptic effects^[2,3], a deeper understanding of the electronic structure and carrier dynamics is necessary for understanding these effects. We report the results of time-integrated and time-resolved photoluminescence investigations and modeling, giving a deeper understanding to the charge carrier dynamics in CdSe nanoplatelets. The influence of phonons to that will be discussed. The reported carrier dynamics is an essential prerequisite to understand the optoelectronic processes in CdSe nanoplateles like lasing or their potential use as optically active modulators media.

Literature:

[1] Ithurria, S., et al., Nature Materials 10(12) (2011): 936-941.

[2] Grim, J. Q., et al., Nature Nanotechnology 9(11) (2014): 891-895.

[3] Achtstein, A. W., et al., ACS Nano 8(8) (2014): 7678-7686.