Cliff Orori Mosiori – författare

Research Paper (undergraduate) from the year 2012 in the subject Energy Sciences, grade: B, , course: Material Engineering Technology, language: English, abstract: In this work, n-type CdxZn1-xS and p-type PbS layers were optimized through chemical solution technique for solar cells. CdxZn1-xS was grown at 820 C while PbS was grown at room temperature utilizing aqueous conditions. Optical constants suitable for solar cells fabrication were investigated. CdxZn1-xS films had a band gap varying from 2.47eV (x = 0.6) to 2.72 eV (x = 1.0), transmittance above 79% in VIS - NIR region with resistivity range of 9.5 101 to 1.22 102 O-cm. PbS had a band gap of 0.89 eV, transmittance below 55% with a resistivity range of 6.78 103 to 1.26 104 O-cm appropriate for solar cell absorber layers. Their solar cell had a short circuit current, Isc = 0.031A, open voltage, Voc = 0.37 V, efficiency, ? = 0.9% with a fill factor, ff = 0.66.

Scientific Essay from the year 2013 in the subject Pedagogy - School System, Educational and School Politics, grade: B, , course: Seminar Presenation of Education Trends in Kenya, language: English, abstract: Who is a teacher in Kenya? What is it like being a teacher in Kenya and what about the history of Teacher Education in Kenya? Teacher and Teacher Education in Kenya forms a very important an essential component of the Kenyan education system. It clearly accounts for the current and future face of the Kenyan child and to sum it all, it influences all aspects of Kenya education, Kenyan developments in morality and even beyond. Just like many countries in Africa, Kenya is a country with diverse ethnicity and ethnic setups with many tribes living with different social cultural upbringing and beliefs and indoctrinations. In Kenya, the teacher and Teacher Education is more often than not influenced by many social, ethnical, political, economic and level technological developments depending on the level of exposure of a particular ethnic group or tribe to the western ideologies and as per what the Kenyan society has undergone. In this paper, I examine and report the emerging issues of Teacher Education in Kenya as influenced by ethnic diversity in relation to the western technological developments. A report on its implications is therefore made here on emerging issues to education, teacher and teacher related developments in this Kenya.

Master's Thesis from the year 2011 in the subject Physics - Applied physics, grade: A, Kenyatta University, course: Master of Science ( Physics), language: English, abstract: In this research an n-type CdxZn1-xS and p-type PbS thin films were optimised for solar cell applications employing chemical bath deposition technique. The thin films were prepared using thiourea and nitrates of cadmium, zinc and lead. Deposition of optimised CdxZn1-xS was done by CBD at 820 C and in alkaline conditions while that of PbS was done at room temperature and both films at normal atmospheric pressure utilizing aqueous conditions. This study concentrated on optimising optical and electrical characterization of the films. Optical constant suitable for photovoltaic applications were sort for and for this purpose a UV VIS IR spectrophotometer 3700 DUV was utilised while the electrical properties were investigated using a four point probe connected to a Keithley 2400 source meter interfaced with computer. The optical band gap of the as deposited CdxZn1-xS films varied from 2.47eV (x =0.6) to 2.72 eV (x =1.0), and transmittance above 79% in the VIS - NIR region for the concentration range of x = 0.6 to 1.0, that is, the band gap increased with increasing Zn concentration of the alloy and Cd06Zn0.4S sample showed the widest band gap. It was obtained that the presence of zinc increased optical band gap. The average extinction coefficients for the as deposited CdxZn1-xS samples were very low revealing that they absorb very little radiation hence a good window layer material. As measured by the four point probe connected to a Keithley 2400 source meter, electrical resistivity increased with increase in Zn in the bath in CdxZn1-xS and a resistivity range of 9.5 101 - 1.22 102 O-cm was obtained. These properties are appropriate for window layers used for photovoltaic cell applications. PbS thin films had a band gap of 0.89 eV and a transmittance of below 55% appropriate for absorber layers of photovoltaic cells and a resistivity range of 6.78 103 to 1.26 104 O-cm. The fabricated photovoltaic cell had a short circuit current, Isc = 0.031 A, open voltage, Voc = 0.37V, efficiency, ? = 0.9% and a fill factor, FF = 0.66 implying that the two materials are appropriate for photovoltaic applications especially in the VIS and IR light spectrum.