Abstracts Book - IMRC 2018

• SC4-P100
DEVELOPMENT OF ULTRA-THIN SOLAR CELLS OF CdS/CdTe
PROCESSED BY THE MAGNETO-PLANAR-SPUTTERING (MPS)
TECHNIQUE
Karla Gutierrez Zayas Bazán 1 , Patricia Gutierrez Zayas Bazán 1 , Francisco de Moure Flores 2 ,
Daniel Jimenez Olarte 1 , Jorge Sastré Hernández 1 , Jorge Ricardo Aguilar Hernández 1 , Concepción
Mejía García 1 , Gerardo Contreras Puente 1
1 Escuela Superior de Física y Matemáticas IPN, Departamento de Física Avanzada, Mexico.
2 Universidad Autónoma de Querétaro, Facultad de Química-Materiales, Mexico.
The impact of transparent and conductive materials, as well as thin filmsemiconductor
materials in daily life has increased in the last years, due to their
applications on thin film transistors, transparent electronics, touch and flat
panel displays, and specially solar cells. For this last application they consist, as
a primary film, on a wide band gap degenerately doped metal oxides, and thus,
they are known as transparent conductive oxides (TCO). Fluorine-doped SnO2:F
(FTO) is the most commonly TCO used in commercial CdTe-solar cells, as it is
deposited during glass manufacturing and it is in general inert to subsequent
processing. Usually, a double layer structure is used, which consist on a highlydoped
primary layer and a nominally-undoped secondary layer. It has been
shown that the secondary layer increases efficiency and/or reproducibility of the
solar cells, and prevents diffusion of atoms the underlying highly-doped
substrate. By the MPS technique it is possible to grow p-type CdTe as an ideal
absorber material for high efficiency low-cost thin-film polycrystalline solar cells.
Moreover the n-type CdS semiconductor continues being the best matching
partner for these ultra-thin film solar cells. These three materials, SnO2, CdS and
CdTe, can be sequentially deposited by the sputtering technique, to get a
uniform deposition and scalability of thin films in the order of 35 nm, 60 nm and
600 nm, respectively. The main objective of this work is to obtain optimal-PV
performance of ultra-thin-film solar cells of CdS/CdTe with an undoped buffer
layer of SnO2 by the MPS technique. The post-thermal (TT) and post-chemical
(ChT) treatments on our processed heterostructures are critical in order to get
the better. Therefore, we explore and discuss for the dependence on the
variations of TT and ChT of the structural, morphological and electrical
properties of the materials. Also, we present the materials characterization
results, and as well as the PV-performance of our solar cells.