Proceedings of nanoGe September Meeting 2017 (NFM17)
Publication date: 20th June 2016
Colloidal semiconductor nanocrystals show potential for optoelectronic applications such as displays, photodetectors and solar cells. For most of these applications it is very important to have a control over the charge density, therefore, doping of nanocrystals is currently heavily investigated. One way to dope nanocrystal assemblies is by electrochemistry, but electrolyte ions in the pores of the nanocrystal films act as external dopant ions.
In this presentation we investigate the energetics and dynamics of electrolyte ion incorporation in ZnO nanocrystal assemblies. The electrochemical electron injection into these assemblies is both very reversible and stable. We demonstrate by a wide range of electrochemical and electrochemical transistor measurements that charge injection into the nanocrystal films is limited by the diffusion of cations in the films. For the electron injection rate, the cations size and concentration matters greatly. Diffusion coefficients are determined for a range of cations of different sizes (lithium the smallest and tetraoctylammonium the largest) which span from 7.9*10-8 cm2/Vs to 2.14*10-9 cm2/Vs. At last the onset of electron injection can vary up to 0.3 V for different cations, and the intensity of the current also varies. This could be an effect of intercalation of the cation into the ZnO crystal lattice.
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