Removal of Methylene Blue by Activated Glass Foams with TiO2 in Dark and Simulated Solar Light

• Main Authors: Rus Florina Stefania, Novaconi Stefan Danica, Vlazan Paulina, Ivanovici Madalina
• Format: Article
• Language: English
• Published: Sciendo 2019-12-01
• Series: Annals of West University of Timisoara: Physics
• Subjects: environment friendly; anatase; foam glass; building materials; photocatalytic activity
• Online Access: https://doi.org/10.2478/awutp-2019-0003

The effect of germanium trapezoidal profile shape on the direct current (DC) current gain (βF), cut-off frequency (fT) and maximum oscillation frequency (fMAX) of silicon-germanium (SiGe) hetero-junction bipolar transistors (HBTs) has been investigated. The energy balance (EB), hydrodynamic (HD) and drift-diffusion (DD) physical transport models in SILVACO technology computer aided design (T-CAD) simulator were used. It was found that the current gain values using energy balance model are higher than hydrodynamic and much higher than those corresponding to drift-diffusion. Moreover, decreasing the germanium gradient slope towards the collector side of the base enhances the maximum oscillation frequencies using HD and EB models whilst, they remain stable for DD model.