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Center for Nonlinear Studies |
Organic electronics have received much attention in recent years due to the flexibility of materials and low-cost fabrication. Typical applications include organic light-emitting devices and photovoltaic cells. In order to improve the device efficiency two or more different materials are often employed forming planar stacked structures. Here we present a device model for a bilayer structure including both charge and exciton transport mechanisms. The microscopic processes at the interface between the two layers play the key role in determining the device performance. The model gives good descriptions on both the light-emitting and photovoltaic devices. The relative impacts of the different processes on measurable macroscopic device characteristics are explored in our calculations by varying the corresponding kinetic coefficients. It is also shown that by inserting a thin insulating layer between the two layers, the efficiency of the photovoltaic devices may be improved.
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