The Role of Dopant Ions on Charge Injection and Transport in Electrochemically Doped Quantum Dot Films.

ABSTRACT: Control over the charge density is very important for implementation of colloidal semiconductor nanocrystals into various optoelectronic applications. A promising approach to dope nanocrystal assemblies is charge injection by electrochemistry, in which the charge compensating electrolyte ions can be regarded as external dopant ions. To gain insight into the doping mechanism and the role of the external dopant ions, we investigate charge injection in ZnO nanocrystal assemblies for a large series of charge compensating electrolyte ions with spectroelectrochemical and electrochemical transistor measurements. We show that charge injection is limited by the diffusion of cations in the nanocrystal films as their diffusion coefficient are found to be ∼7 orders of magnitude lower than those of ele

SUBMITTER: Gudjonsdottir S 

PROVIDER: S-EPMC5981292 | biostudies-literature | 2018 May

REPOSITORIES: biostudies-literature