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Wavefunction Engineering of Type-I/Type-II Excitons of CdSe/CdS Core-Shell Quantum Dots.
Scientific Reports ( IF 3.8 ) Pub Date : 2019-Jan-09 , DOI: 10.1038/s41598-018-37676-3
Yashaswi Nandan , Mohan Singh Mehata
Scientific Reports ( IF 3.8 ) Pub Date : 2019-Jan-09 , DOI: 10.1038/s41598-018-37676-3
Yashaswi Nandan , Mohan Singh Mehata
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Nanostructured semiconductors have the unique shape/size-dependent band gap tunability, which has various applications. The quantum confinement effect allows controlling the spatial distribution of the charge carriers in the core-shell quantum dots (QDs). Upon increasing shell thickness (e.g., from 0.25-3.25 nm) of core-shell QDs, the radial distribution function (RDF) of hole shifts towards the shell suggesting the confinement region switched from Type-I to Type-II excitons. As a result, there is a jump in the transition energy towards the higher side (blue shift). However, an intermediate state appeared as pseudo Type II excitons, in which holes are co-localized in the shell as well core whereas electrons are confined in core only, resulting in a dual absorption band (excitation energy), carried out by the analysis of the overlap percentage using the Hartree-Fock method. The findings are a close approximation to the experimental evidences. Thus, the understanding of the motion of e-h in core-shell QDs is essential for photovoltaic, LEDs, etc.
更新日期：2019-01-09
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