Study the optical, electrical and structural properties of silicon-based CdTe solar cell
Other Title(s)
دراسة الخواص الكهربائية و الضوئية و التركيبية من لخلية شمسية من CdTe على قاعدة سليكونية
Dissertant
al-Husayni, Mustafa Muhammad Ali Husayn
Thesis advisor
Muhammad, Ghusun Hamid
Abd Allah, Manal Midhat
University
University of Baghdad
Faculty
College of Science
Department
Department of Physics
University Country
Iraq
Degree
Ph.D.
Degree Date
2013
English Abstract
This thesis describes the fabrication and characterization of CdTe/Si and CdTe/SiO2/Si devices along with the development of CdTe based solar cells.
Solar cells hold great hopes for use as an environmental friendly and economically viable renewable energy source.
For this purpose, thin film materials are being investigated by various research organizations and groups.
In this work we have investigated n-CdTe as an absorber, SiO2 as an ultrathin tunneling layer, p-Si as a substrate, ITO thin film as a window layer and front contact, and Au thin film to solve the back contact problem of Si (due to its high work function).
The structural, optical, and electrical properties of the CdTe layer separately and/or with the device structure were studied.
Structure of CdTe films was observed by X-ray, optical profilometer, and AFM analysis techniques.
It is observed that the CdTe films had zincblende structure.
These films showed a preferred orientation along the (111) axis.
The XRD patterns show increase in crystallinity of films as Ts and film thickness increase.
The grain size has also been calculated, it was found to be in the range of 14-29.1nm.
The adhesion force between the substrate and the thin film decreases when Ts and/or the thickness of the film increase.
AFM images of the surface topography of CdTe film show very good smoothness of the surface topography.
It is observed that CdTe films have a high absorption in the UV and visible regions.
The bandgap energy values obtained for the films are also in the range where these can be easily utilized for maximum output conversion efficiency.
For each sample two values of bandgap energy is obtained.
Optical constants are obtained from Ellipsometry data from which the viii behavior of refractive index n, extinction coefficient k, and real and imaginary parts of dielectric constant are demonstrated.
All films showed n-type conductivity during the Hall Effect measurement.
The obtained value of mobility is interestingly high.
From the D.C.
conductivity measurements, two values of activation energies were obtained.
I-V characterization for poly crystal CdTe based solar cells at different illumination levels are carried out, which showed 3.61% efficiency.
The effect of oxide layer on the device wasalso investigated
Main Subjects
No. of Pages
122
Table of Contents
Table of contents.
Abstract.
Abstract in Arabic.
Chapter One : Introduction.
Chapter Two : Theory of PV devices.
Chapter Three : Experimental procedures.
Chapter Four : Measurements, results and discussions.
Chapter Five : Conclusions and suggestions.
References.
American Psychological Association (APA)
al-Husayni, Mustafa Muhammad Ali Husayn. (2013). Study the optical, electrical and structural properties of silicon-based CdTe solar cell. (Doctoral dissertations Theses and Dissertations Master). University of Baghdad, Iraq
https://search.emarefa.net/detail/BIM-607778
Modern Language Association (MLA)
al-Husayni, Mustafa Muhammad Ali Husayn. Study the optical, electrical and structural properties of silicon-based CdTe solar cell. (Doctoral dissertations Theses and Dissertations Master). University of Baghdad. (2013).
https://search.emarefa.net/detail/BIM-607778
American Medical Association (AMA)
al-Husayni, Mustafa Muhammad Ali Husayn. (2013). Study the optical, electrical and structural properties of silicon-based CdTe solar cell. (Doctoral dissertations Theses and Dissertations Master). University of Baghdad, Iraq
https://search.emarefa.net/detail/BIM-607778
Language
English
Data Type
Arab Theses
Record ID
BIM-607778
