Contact free potential mapping by vibrating capacitor
The contact free vibrating capacitor method is a valuable tool for investigating the surface potentials of solid surfaces. The purpose of the present article is to summarize the theory and capabilities of the vibrating capacitor method, especially scanning vibrating capacitor pictures in the electronics. After a brief review some results will be discussed, such as a contact potential map taken from a printed circuit board, a surface potential map from a biased ceramic thick film circuit and some results from silicon solid state devices and solar cells. Potential maps contain a lot of information concerning the surface conditions, included the inhomogeneities of the technology, bias and other additional excitation. These potential maps may help in the development, quality control and defect analysis
Determination of SiO2–Si interface trap level density (Dit) by vibrating capacitor method
Abstract The interface trap level density, D it , is one of the most important parameters of the SiO 2 –Si layer structure. C – V methods are suitable for measuring D it . However, the importance of non-destructive, touch-free methods has recently been increasing. Contactless methods use capacitive coupling. Vibration (vibrating capacitor), temperature difference and light are used for surface excitation; interface trap level density can be determined from the change in the value of oxide surface potential (work function). The present article discusses a new method for determining SiO 2 –Si interface trap level density, D it , by the vibrating capacitor method, focussing on theory, application and evaluation of the results. Measured potential maps are presented, and the results are converted into D it distributions as examples for the application of this method.
Metallurgical Process Engineering
The "material of choice" - steel.- Uprising of China's steel industry.- Process manufacturing industry and process engineering.- Engineering science in steel manufacturing process.- Analysis and integration of metallurgical manufacturing process.- Multi-dimensional mass flow control for metallurgical manufacturing process.- Time factors in steel manufacturing process.-Operating dynamics in the production process of steel plant.- Structure and mode of steel plant.- Steel plant and environment.