Announcement

Title Description
PHD PROPOSAL SEMINAR ANNOUNCEMENT - 11:00 AM - 12:00 PM MONDAY 24TH MAY 2021

This is to invite you to our next PhD Proposal defense seminar by Mr. Brian Owuor on Monday 24th May 2021 between 11:00 am - 12:00 pm.

Here below are the details:

TITLE: Investigation on the Performance and Stability of Cs3Sb2I9 Based Perovskite Solar Cells Employing P3HT And CuSCN Hole Transport Materials.

PRESENTER: Mr. Brian Owuor, PhD Student 

MAIN SUPERVISOR: Prof. F. W. Nyongesa

 

ABSTRACT:

 

Methylammonium lead iodide (CH3NH3PbI3) perovskite materials have, in recent years, evolved as excellent absorber materials in perovskite solar cells. Whereas devices utilizing CH3NH3PbI3 as the absorber material exhibit high efficiencies exceeding 20 percent, critical concerns remain, such as the potential harmful effects of lead and the device instability under humid air conditions. Owing to its enhanced air-stability and superior optical properties, cesium antimony iodide (Cs3Sb2I9) perovskite material has recently gained considerable interest as an appropriate replacement for Pb-based perovskites. Herein, purely inorganic cesium antimony iodide (Cs3Sb2I9) perovskite material will be obtained by co-evaporation of CsI and SbI3. In addition to the perovskite materials, the hole-transport materials also play an important role in the efficiency and stability of the cells.Copper thiocyanate (CuSCN) and poly (3-hexylthiophene) (P3HT) hole-transport materialshave also received significant attention due to their low cost, considerably high hole-mobility, excellent thermal stability and suitable energy levels. In this study,hole-transporting layers ofP3HT and CuSCN will be deposited by spin coatingtechnique. Optical characteristics of the films will be studied by UV-Visible spectroscopy. X-ray diffraction spectroscopy will be utilized to investigate the structural features of the deposited films. Determination of band gap shifts of the deposited films will be evaluated by photoluminescence (PL). Photothermal deflection spectroscopy (PDS) will be utilized to determine the deep & shallow defects while the surface electronic structure of the perovskite layer will be evaluated using x-ray photoelectron spectroscopy (XPS). Morphological properties of the films together with the cross-sectional structure of the fabricated solar cells will be analyzed by scanning electron microscope (SEM). Solar simulator with irradiation of 1000W/m2 (A.M 1.5) will be employed to study the current–voltage characteristics of the fabricated solar cells. Finally, surface photovoltage (SPV) and impedance spectroscopy (IS) will be used to determine carrier generation and recombination of the fabricated cells.

 

ALL ARE WELCOME AND PLEASE KEEP TIME!

PhD (Physics) scholarship for a female student

Project Title: Development of a Raman spectroscopic method for rapid real-time reproductive hormone assay in blood

Raman spectroscopy is a technique involving using a laser light to excite a sample of interest and the inelastically scattered (Raman) light collected and analyzed. The spectrum of Raman scattered light provides details of the Raman active molecules present in the sample under study. Since each molecule has unique energy structure, Raman spectral profiles of molecules are also specific to each. The intensity of the Raman bands is also known to be related to the number of scattering molecules, hence concentration. Utilizing these unique properties of the Raman scattering phenomenon in rapid and real-time reproductive hormone assay will be explored in this work.   

This interdisciplinary project will be done at the laser physics and spectroscopy research group, Department of Physics, University of Nairobi. It is suitable for a FEMALE student who has the following qualifications:

  • Has earned an MSc (physics) degree from a recognized university.
  • Has obtained a PhD (physics) admission letter from the University of Nairobi.
  • Has a good background in Chemometrics and is proficient in one or more of the following software packages: MATLAB, R, or Python.

The scholarship will cover tuition fees and a monthly stipend (KSH. 60,000) and will be renewable annually, subject to satisfactory progress, for a period of 3 years.

Eligible candidates should send their application (soft copy only) to:

The Thematic Head

Laser Physics and Spectroscopy

Department of Physics

University of Nairobi

 

using the following email address: laser@uonbi.ac.ke. The application should include the following supporting documents:

 

  • Certified MSc (Physics) certificate
  • Certified MSc transcripts
  • Abstract of MSc thesis
  • PhD (Physics) admission letter from the University of Nairobi
  • Copy of national ID or passport
  • Name, mobile number, and email address of two (2) referees.

 

The deadline for application is 30th June 2021.

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