Abstracts Book - IMRC 2018

• SC4-P097
OPTICAL AND MORPHOLOGICAL STUDY OF CDS NANOWIRES FOR
USE AS A WINDOW MATERIAL IN CdS/CdTe SOLAR CELLS
Patricia Gutierrez Zayas Bazán 1 , Karla Gutierrez Zayas Bazán 1 , Osvaldo de Melo Pereira 2 , Jorge
Ricardo Aguilar Hernández 1 , Francisco de Moure Flores 3 , Miguel Tufiño Velázquez 1 , Gerardo S.
Contreras Puente 1
1 Escuela Superior de Física y Matemáticas IPN, Física Avanzada, Mexico. 2 Universidad de La
Habana, Facultad de Física, Cuba. 3 Universidad Autónoma de Querétaro, Facultad de Química,
Mexico.
Preparation and research of semiconductor nanowires has been one of the main
topics developed in recent years. This is because they have important applications
at the nanoscale like comprising sensors, 3 rd generation solar cells and lasers. CdS
is a n-type II–VI semiconductor having a direct band gap of 2.4 eV at room
temperature, typically used as window material in thin film solar cells.
CdS nanostructured materials have attracted a great deal of interest in photovoltaic
applications due to possible enhancement in power conversion efficiency arising
their large surface-to-volume ratio. Therefore a solar cell based in CdS nanowires
as window material would greatly raise the area of the absorber material. Reflection
losses and photo- excited carrier mean free paths could be decreased as well with
a consequent increase in efficiency.
In this work, CdS nanowires were prepared employing vapor-liquid-solid method
using Bi nanoparticles as catalyst onto a CdS thin layer as substrate. Scanning
electron microscopy techniques allowed observing the processed nanowires and
their corresponding morphology. With EDX analysis was corroborated the
composition of the nanowires and the localization of Bi nanoparticles. The
nanowires show an intense and very brilliant PL at room temperature composed by
a wide band and a narrow peak around 2.02 eV and 2.41 eV, respectively. The PL
spectra was studied as a function of temperature and was determined the origin of
the different peaks and their properties.
Acknowledgment: The authors gratefully acknowledge the project SIP-
20180374 and CeMIE-Sol for the financial support of projects P25 and P37.
Keywords: Solar cell, CdS nanowires, Bi nanoparticles
Presenting authors email: patriciagzb2006@gmail.com