(Invited) Simulation of CdSe Based Quantum Dot Hybrid Light Emitting Diodes Using Tcad Continuous Models

Organic-inorganic hybrid quantum dot (QD) based light emitting diodes (LEDs) have been investigated. Stacked hybrid QD LED structures, based on cadmium selenide QD with cadmium sulfide barrier shells, have been fabricated at the Universtiat Rovira i Virgili using spin coating techniques. These have been modelled, with Technology Computer Aided Design (TCAD) software, using two different carrier conduction models. Two quantum confinements models are used to predict the electronic transport through these stacks. A 1D simulation of a stack with a single QD mono-layer, using the Silvaco Radiant tool based on the Atlas engine, is reported. This approach allows device designers to optimise the current density and spectral response as a function of QD radius (as shown in the figure) and transport layer thicknesses. Furthermore, a second approach using a 3D QD simulation in which the user can investigate the effect of the QD radius and barrier layer thickness on the carrier confinement in the structures is shown. This work demonstrates the capability of 1D simulations, using the Radiant software tool, to model the behavior of single QD mono-layer structures. The user friendly input graphical user interface, as well as the speed of the simulation, helps to iterate the design quickly to optimise QD size and transport layer thicknesses for maximum intensity at the desired spectral output. Figure 1