Discrimination of surface and volume states in fully depleted field-effect devices on thick insulator substrates

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Title: Discrimination of surface and volume states in fully depleted field-effect devices on thick insulator substrates
Author: Manley, Robert
Abstract: The behavior of electronic devices fabricated on thin, lightly doped semiconductor layers can be significantly influenced by very low levels of non-ideal charge states. Such devices typically operate in a fully depleted mode, and can exhibit significantly different electrical properties and characteristics than their bulk material counterparts. Traditional interpretation of device characteristics may identify the existence of such non-idealities, but fail to ascertain if the origin is from within the semiconductor layer or associated with the interfaces to adjacent dielectric materials. This leads to ambiguity in how to rectify the behavior and improve device performance. Characterizing non-idealities through electrical means requires adaptations in both measurement techniques and data interpretation. Some of these adaptations have been applied in material systems like silicon-on-insulator (SOI), however in systems where the semiconductor film becomes increasingly isolated on very thick insulators (i.e., glass), the device physics of operation presents new challenges. Overcoming the obstacles in interpretation can directly aid the technology development of thin semiconductor films on thick insulator substrates. The investigation is initiated by isolating the interface of crystalline silicon bonded to a thick boro-aluminosilicate glass insulator. The interface is studied through traditional bulk capacitance-voltage (C-V) methods, and the electrical fragility of the interface is exposed. This reveals the necessity to discriminate between interface states and bulk defect states. To study methods of discrimination, the physics of field-effect devices fabricated on isolated semiconducting films is explained. These devices operate in a fully depleted state; expressions that describe the C-V relationship with a single gate electrode are derived and explored. The discussion presents an explanation of how surface and volume charge states each contribute to the C-V characteristic behavior. Application of this adapted C-V theory is then applied to the gated-diode, a novel device which has proven to be instrumental in charge state discrimination. Through this adaptation, the gated-diode is used to extract recombination-generation parameters isolated to the top surface, bottom surface and within the volume of the film. The methodology is developed through an exploration of devices fabricated on SOI and silicon-on-glass (SiOG) substrates, and furthers the understanding needed to improve material quality and device performance.
Record URI: http://hdl.handle.net/1850/13806
Date: 2011-04

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