Electronic doping in colloidal semiconductor nanocrystals

Physical and Analytical Chemistry Seminar

Lecturer: Joanna Dehnel

03-03 Sep 2019

Location: Faculty Seminar Room

Colloidal semiconductor nanocrystals (NCs) are known from their tunable photo-physical properties by variation of size, shape and composition. Last decade studies paid special attention for incorporating of isovalent magnetic ions (e.g. Mn2+) in II–VI NCs which influence their magneto-optical properties without introducing an additional charge into the system.
Recently, research interest has shifted toward incorporation of heterovalent impurities, with respect to the cations sub-lattice commonly called electronic doping. Their insertion changes the overall charge within the host compound, resulting in p- or n- type doping depending on their coordination state and enhance their performance of optical and electronical properties.
An emerging electronic dopant in II-VI NCs is silver (Ag), whose incorporation as Ag+ impurities leads to the introduction of the intragap deep acceptor level which capture the conduction band electron resulting in a Stokes-shifted emission.
In this presentation, I will review the recent synthesis development methods to introduce Ag+ to the host CdSe NCs and focus on investigation of their optical and electrical properties.


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