Browsing Gold Collection by Author "Sakwa, Thomas"
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Compositional analysis and optical properties of Co doped TiO2 thin films fabricated by spray pyrolysis method for dielectric and p hotocatalytic applications
Wafula, Henry Barasa; Musembi, Robinson Juma; Juma, Albert Owino; Tonui, Patrick; Simiyu, Justus; Sakwa, Thomas; Prakash, Deo; Verma, K.D. (Optik, 2017-01)Cobalt doped TiO2 thin films (CTF) deposited by spray pyrolysis has been studied. The compositional analysis has been done using RBS method, while optical spectroscopy has been done by measuring the transmittance and ... -
Investigation of Structural and Electronic Properties of CH3NH3PbI3 Stabilized by Varying Concentrations of Poly(Methyl Methacrylate) (PMMA)
Awino, Celline; Odari, Victor; Dittrich, Thomas; Prajongtat, Pongthep; Sakwa, Thomas; Rech, Bernd (MDPI, 2017-05-26)Studies have shown that perovskites have a high potential of outdoing silicon based solar cells in terms of solar energy conversion, but their rate of degradation is also high. This study reports on improvement on the ... -
Role of Cl on Diffusion of Cu in In2S3 Layers Prepared by Ion Layer Gas Reaction Method
Wafula, Henry; Robinson, Musembi; Juma, Albert; Sakwa, Thomas; e Kitui, Manass; Araoz, Rodrigo; Fischer, Christian-H. (coatings, 2015-02-15)Ion layer gas reaction (ILGAR) method allows for deposition of Cl-containing and Cl-free In2S3 layers from InCl3 and In(OCCH3CHOCCH3)3 precursor salts, respectively. A comparative study was performed to investigate the ... -
A Surface Photovoltage Study of Surface Defects on Co-Doped TiO2 Thin Films Deposited by Spray Pyrolysis
Wafula, Henry; Juma, Albert; Sakwa, Thomas; Musembi, Robinson; Simiyu, Justus (MDPI, 2016-07-22)Surface photovoltage (SPV) spectroscopy is a powerful tool for studying electronic defects on semiconductor surfaces, at interfaces, and in bulk for a wide range of materials. Undoped and Cobalt-doped TiO2 (CTO) thin films ...