엔트리 Ingrid Schwarz

Optical Simulation of Organic Light Emitting Diode by Transfer Matrix Method with a Green’s Function Approach and 2D FDTD

10월 1, 2015카테고리: /작성자:

Organic light emitting diode (OLED) has been getting much attention over the past decades in the field of displays and lighting applications for its excellent efficiency, color quality and color tunability. Optical modeling of OLEDs is one important development issue to create high performance devices [1]. In this article, several optical simulations of OLEDs are presented by using recently implemented features in Atlas. First, we present the multiple dipole sources emission from a stacked layers structure, including the interference effect between the emitted light and reflected light using Transfer Matrix Method (TMM) with a Green’s Function Approach [2-4]. Then, we present the 2D FDTD analysis on the device with the grating structure using the finite difference time domain (FDTD) [5].

3D TCAD Mixed-Mode Simulation of Current Filaments in IGBT Multicell Array under Short-Circuit Condition

10월 1, 2015카테고리: /작성자:

A power IGBT (Insulated Gate Bipolar Transistor) is conventionally made up of a repetitive array of homogenous IGBT cells. Such a homogenous configuration renders a uniform current flow across the active surface area of the IGBT chip when the IGBT is turned on. Under a short-circuit condition, however, the IGBT being turned on is exposed to a very high collector-to-emitter voltage. In this condition, the IGBT conducts a very high collector current, leading to correspondingly high power dissipation in the form of heat flowing uniformly across the chip. If the heating of the chip exceeds a critical level during a short-circuit operation, the device may fail or even get destroyed by local overheating in conjunction with the establishment of current filaments in a localized area, or the hot spots, within the device.

Improvements and Features of the Updated DeckBuild 2 GUI

7월 1, 2015카테고리: /작성자:

In this article we will emphasize the new features and improvements of the DeckBuild 2 deck editing environment. We will start by illustrating the examples section, followed by the basic execution modes of DeckBuild and a description of how an Athena deck can be automatically converted to be run in Victory Process. The article will also demonstrate how the visualization tools TonyPlot and TonyPlot3D are integrated and available directly from the various parts of DeckBuild.

Performance Improvement by MPI Parallelization in 3D Device Simulation

7월 1, 2015카테고리: /작성자:

As the design technology for power devices, such as MOSFET, GTO, and IGBT has matured, the importance of large domain 3D TCAD simulation has increased rapidly. Distributed computing is one of the attractive solutions for such simulations, because the system’s performance and capability is not limited by the number of CPUs or the total amount of memory on a specific computer. This advantage of distributed computing is expected to be increasingly advantageous, as the size and mesh point count for these devices becomes ever larger.

Electrical Simulation of Liquid Crystals

7월 1, 2015카테고리: /작성자:

Liquid Crystals (LCs) are state of matter intermediate between that of a crystalline and a liquid. The optical, mechanical, electrical and magnetic properties of LC medium are defined by the orientation order of the constituent anisotropic molecules. Due to the anisotropy of the electrical properties, the orientation of the LC molecules is effectively controlled by electric fields. As a result, LCs exhibit very specific electrooptical phenomena because of their large birefringence. All of these are important to the functional devices based on LCs, for example, flat panel displays that have been commercialized for decades.

Hints, Tips and Solutions – Local conformal mesh refinement in Victory Process

7월 1, 2015카테고리: /작성자:

The Victory Process conformal export is generated from the volume planes specified in a user deck. The accuracy and resolution of the export is currently controlled by these planes. Local refinement gives a further level of user control that allows the mesh density to be increased near regions of interest. We now support: interface, junction, box and global refinement schemes. These refinement schemes behave similarly to the Delaunay export, with the exception that the distance parameter is calculated automatically. This is necessary since the conformal nature of the mesh would be lost if the wrong distance is used.

Radiant: GUI-based Design Software for Performing Simulations of Optoelectronic Thin Film Devices Such as LED and OLED

4월 1, 2015카테고리: /작성자:

Device simulation helps users understand and depict the physical processes in a device and to make reliable predictions of the behavior of the next device generation. Device simulations with properly selected, calibrated models and an appropriate mesh structure are very useful for predictive analysis of novel device structures. This helps provide improved reliability and scalability, while also helping to increase development speed and reduce risks and uncertainties.