Author ORCID Identifier

https://orcid.org/0000-0001-9801-8820

Year of Publication

2020

Degree Name

Master of Science in Electrical Engineering (MSEE)

Document Type

Master's Thesis

College

Engineering

Department

Electrical and Computer Engineering

First Advisor

Dr. Vijay P. Singh

Abstract

Numerical simulations are performed to investigate the effects of host nanotube parameters (pore diameter and pitch for different CdS coverages) and CdTe doping density on device performance in nanowire CdS/ CdTe solar cells using SCAPS-1D. This research finds the optimum values for these parameters in order to achieve the highest efficiency. Experimentally the effect of anodization voltage and fluoride ion concentration on the pore diameter and the pitch are studied for the Titania nanotubes host. It is observed that in the range of 0.3 mL to 2 mL of ammonium fluoride content, pore diameter and the pitch of the Titania nanotube host matrix, fabricated in ethylene glycol-based electrolyte, is rather insensitive to the ammonium fluoride concentration. It is also shown that anodization voltage is the more effective parameter, which can be tailored and optimized to fabricate Titania Nanotube arrays of desired porosity. The bulk series resistance of the device, in addition to the CdTe doping density, varies upon varying the pore diameter and the pitch of the nanotubes for various fractions of CdS coverages. In this work, theoretical absorption profile was interpolated using the experimentally obtained absorption spectrum for various fractions of CdS coverages. The highest efficiency for this NW-CdS/CdTe solar cell structure at 300°K was found to be 25.93% with short circuit current of 28.3 mA cm-2, open circuit voltage of 1.11 V and fill factor of 0.825; this was obtained when the pore diameter and the pitch of the host nanotube was in the range of 2.35nm – 23.48nm and 100nm – 1000nm respectively and the CdTe doping density was 1017 cm-3. Thus, it is shown that the host nanotube parameters (pore diameter and pitch for different CdS coverages) and CdTe doping density can be tailored to give optimum device performance.

Digital Object Identifier (DOI)

https://doi.org/10.13023/etd.2020.150

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