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Photon Absorption Improvement in Reststrahlen Band
of Mn
1.56
Co
0.96x
Ni
0.48
Fe
x
O
4
Series Films
XIAOBO ZHANG,
1
QIN SHI,
2,3,4
WEI REN ,
2,5
QING ZHOU,
1,6
HEWEI LU,
1
SHUAI BAO,
1
LEI WANG,
2
LIANG BIAN,
2
JINBAO XU,
2
and AIMIN CHANG
2
1.—International Joint Research Center of China for Optoelectronic and Energy Materials, School
of Physics and Astronomy, Yunnan University, Kunming 650091, China. 2.—Key Laboratory of
Functional Materials and Devices for Special Environments of CAS, Xinjiang Key Laboratory
of Electronic Information Materials and Devices, Xinjiang Technical Institute of Physics &
Chemistry, CAS, Urumqi 830011, China. 3.—Department of Physics, Shihezi University, Shihezi
832003, China. 4.—University of Chinese Academy of Sciences, Beijing 100049, China. 5.—e-mail:
renw@ms.xjb.ac.cn. 6.—e-mail: zhouqing@ynu.edu.cn
Mn
1.56
Co
0.96x
Ni
0.48
Fe
x
O
4
series films have been fabricated on SiO
2
/Si(100)
substrates by chemical solution deposition and characterized by scanning
electron microscopy, and their structural and mid-infrared (IR) properties
investigated. The results indicate slight improvement in the microstructure
and density of the films with increasing Fe content. The results of Raman
spectroscopy showed variation in the local distortion and cation distribution at
octahedral sites with elevated Fe content. The IR optical properties of the
films were investigated at room temperature in the wavelength range from
1.5 lmto25lm. A strong absorption peak corresponding to Reststrahlen
band located at 19.5 lm was observed and its absorption intensity found to
improve with increasing Fe content in the films. The maximum absorption
coefficient was calculated to be about 18,000 cm
1
. The results bear techno-
logical significance for the design and fabrication of devices for IR detection
applications.
Key words: Thin film, spinel, optical absorption, reststrahlen band, Raman
INTRODUCTION
Over recent decades, transition-metal oxides have
been extensively investigated due to their wide
range of fascinating physical properties and various
physical phenomena, such as spin glass effects,
superconductivity, superparamagnetism, and ferro-
magnetism.
1,2
Among these materials, ternary
spinel oxides of type Mn-Co-Ni-O with general
formula AB
2
O
4
are potential candidates for use in
uncooled infrared (IR) detection
2
due to their excep-
tional negative temperature coefficient, robust ther-
mal stability, moderate resistivity, and rapid
response time.
3
In particular, Mn
1.56
Co
0.96
Ni
0.48
O
4
(MCN) is considered an important composition
because its resistivity is close to the minimum
reported among Mn-Co-Ni-O ternary oxides.
4
More-
over, MCN spinel is a promising material for use in
thermal detection with a wide spectral range. The
thermal, electrical, and optical properties of MCN
film have been extensively studied, and its promis-
ing application in uncooled bolometers systemati-
cally investigated.
5
However, the optical properties,
in particular the optical absorption in Reststrahlen
band, of MCN film have not yet been completely
clarified.
6–11
Dannenberg’s group reported rest-
strahlen and Raman absorption from 469 cm
1
to
623 cm
1
from Raman scattering measurements
and Fourier-transform infrared (FTIR) spec-
troscopy,
7
as also confirmed by Kong et al.
6
Huang’s
group also studied the optical properties, in partic-
ular the ultraviolet–visible–near IR and IR optical
constants, of MCN films using spectroscopic
(Received January 4, 2017; accepted April 26, 2017;
published online May 10, 2017)
Journal of ELECTRONIC MATERIALS, Vol. 46, No. 8, 2017
DOI: 10.1007/s11664-017-5556-z
Ó 2017 The Minerals, Metals & Materials Society
5349