Modeling and Analysis of Spatially Distributed Material Properties in Novel Electronic Devices.

摘要

This dissertation focuses on the modeling and analysis of several promising diode based electronic devices. With years of devoted research work on solution processed semiconductors and thin film structures. a number of highly interesting applications have been demonstrated. including transistors, light emitting devices, memories, and photovoltaic cells. With a promise of low production costs and ever improving performances in recent years; the new devices are gaining more attentions and presenting a stronger potential of revolutionizing the industry of electronics.;At this moment, with a rapid growth of device performance which is mainly powered by experimental efforts, it is crucial to gain deeper understandings of the physical mechanisms at a microscopic level, especially the parts that differ from traditional silicon based and vacuum deposition processed devices. Due to the nature of randomness which typically go with a simple and quick solution deposition process. non-uniformities commonly exist in the active layers of these devices, and play various complicated roles. Investigation of this part is the main motivation of the works presented here.;The dissertation mainly discusses about the exploration of two families of devices: solution processed solar cells and solution processed memories. In both cases, the naturally formed non-uniform material distributions are critical for the working mechanism of the devices. Through several different approaches, mathematical models have been developed for each type of the devices, and through some calculations and/or analysis, better control approaches are designed and resulted in better performances.;Several practical modeling and simulation methods for these devices are introduced throughout the process, including a kinetic Monte Carlo simulation for organic solar cells, a robust parameter extraction method for various types of solar cells, a circuit networked based modeling/simulation approach for solar cells with non-uniform properties, and a met hod for estimating the electrical field distributions in polymer based memory devices.