Ohmic contacts to AlGaN/GaN heterostructures, which have low contact resistance and a good surface morphology, are required for the development of high temperature, high power and high frequency electronic devices. The paper presents the investigation of a Ti/Al based Ti/Al/Ni/Au ohmic contact to AlGaN/GaN heterostructures. Multilayer metallization of Ti/Al/Ni/Au was evaporated by an electron g...

A low resistance Ohmic contact to p-type GaN is essential for reliable operation of electronic and optoelectronic devices. Such contacts have been made using Ni/Au and Pd / Au contacts to p-type Mg-doped GaN (1.41x10 cm) grown by metalorganic chemical vapor deposition ( MOCVD ) on ( 0001 ) sapphire substrates. Thermal evaporation was used for the deposition of those metals followed by annealing...

II The cover image shows partial intercalation of gold (in yellow) into Ti3SiC2 observed by scanning transmission electron microscopy; a result from my research. During the course of research underlying this thesis, I was enrolled in Agora Materiae, a multidisciplinary doctoral program at Linköping University, Sweden. Abstract Chemical gas sensors are widely-used electronic devices for detectin...

We present self-consistent, non-equilibrium Green's function calculations of the characteristics of short channel carbon nanotube transistors, focusing on the regime of ballistic transport with ohmic contacts. We first establish that the band line-up at the contacts is renormalized by charge transfer, leading to Schottky contacts for small diameter nanotubes and ohmic contacts for large diamete...

A novel Pd-based Ohmic contact system is developed for n-GaAs. Metallization samples are annealed at various temperatures and systematically characterized using current-voltage (I-V) measurements, Tencor surface profilometry measurements, Scanning electron microscopy (SEM) and Secondary ion mass spectrometry (SIMS). Tencor measurements and SEM are employed to investigate the surface morphology ...

Contact lenses (CLs) are safe and commonly used method to correct the refractive errors. Rigid gas permeable (RGP) CLs are the first option in visual rehabilitation of patients with irregular cornea, helping to further delay surgical treatment and improve patients’ quality of life (QoL). Although, the practice of CLs in patients with irregular cornea must be based on evidence, there is a lack o...