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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