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Spin-Dependent Exciton Quenching and Intrinsic Spin Coherence in CdSe/CdS Nanocrystals

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Optically Active Charge Traps and Chemical Defects in Semiconducting Nanocrystals Probed by Pulsed Optically Detected Magnetic Resonance

Part of the book series: Springer Theses ((Springer Theses))

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Abstract

Large surface-to-volume ratios of semiconductor nanocrystals cause susceptibility to charge trapping, which can modify luminescence yields and induce single-particle blinking. Optical spectroscopies cannot differentiate between bulk and surface traps in contrast to spin-resonance techniques, which in principle avail chemical information on such trap sites. Magnetic resonance detection via spin-controlled photoluminescence enables the direct observation of interactions between emissive excitons and trapped charges. This approach allows the discrimination of two functionally different trap states in CdSe/CdS nanocrystals underlying the fluorescence quenching and thus blinking mechanisms: a spin-dependent Auger process in charged particles; and a charge-separated state pair process, which leaves the particle neutral. The paramagnetic trap centers offer control of energy transfer from the wide-gap CdS to the narrow-gap CdSe, i.e. light harvesting within the heterostructure. Coherent spin motion within the trap states of the CdS arms of nanocrystal tetrapods is reflected by spatially remote luminescence from CdSe cores with surprisingly long coherence times of > 300 ns at 3.5 K.

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  1. Department of Physics & Astronomy, University of Utah, Salt Lake City, Utah, USA

    Kipp van Schooten

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van Schooten, K. (2013). Spin-Dependent Exciton Quenching and Intrinsic Spin Coherence in CdSe/CdS Nanocrystals. In: Optically Active Charge Traps and Chemical Defects in Semiconducting Nanocrystals Probed by Pulsed Optically Detected Magnetic Resonance. Springer Theses. Springer, Heidelberg. https://doi.org/10.1007/978-3-319-00590-4_3

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