Shape-Tuned Exciton Dynamics in InP Quantum Dots
Bora Kim a b, Eunhye Cho a b, Sunghu Kim a b, Young-Shin Park c, Sohee Jeong a b d
a Department of Energy Science, Sungkyunkwan University, Suwon, South Korea
b Artificial Atom and Quantum Materials Center, Sungkyunkwan University, Suwon, South Korea
c Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, South Korea
d SKKU Institute of Energy Science & Technology (SIEST), Sungkyunkwan University, Suwon, South Korea
Proceedings of International Conference on Emerging Light Emitting Materials (EMLEM22)
Materials for next generation LEDs and lasers:
Limasol, Cyprus, 2022 October 3rd - 5th
Organizers: Maksym Kovalenko, Maryna Bodnarchuk and Grigorios Itskos
Poster, Bora Kim, 081
Publication date: 15th July 2022

Understanding and manipulating exciton behavior is a major issue in semiconductor nanomaterials, as the properties of nanomaterials depend on the fate of the excitons. Recently, we demonstrated the shape-tuning strategy of single-crystalline InP quantum dots [1]. This shape-tuning strategy modulates the exciton confinement orientation of nanocrystals, allowing the transition from single photon emitters to multi-photon emitters [2]. For tetrapods with arms longer than the exciton bohr radius of InP, they clearly showed the 2D-confined character with the arm-localized excitons as individual emitting states. In addition, our single-crystalline tetrapods allow the exciton to behave in true tetrapod geometry, resulting in unique emission properties different from the hetero-structured tetrapods [3-4]. Therefore, shape-tuning of single-crystalline nanocrystals provides an understanding of true exciton dynamics in various shapes of InP nanocrystals, and can be applied to future material functional engineering. In this study, we will talk about the analysis of exciton dynamics in various shapes of InP quantum dots using transient absorption spectroscopy.

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