2024年6月14日发(作者：万阳朔)
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【关键字】论文
BRIEF COMMUNICATION
Preparation and photoelectric properties of mesoporous ZnO films
Ming Ming Wu •Yue Shen •Feng Gu •
Yi An Xie •Jian Cheng Zhang •Lin Jun Wang
Received:24June 2009/Accepted:21October 2009/Published online:6November
2009ÓSpringer Science+Business Media,LLC 2009
Abstract Mesoporous ZnO films doped with Ti 4?(M-ZnOhave been prepared by
doping process and sol–gel films have mesoporous structures and consist of
nano-crystalline phase,as evidenced from small angle X-ray diffraction and high
resolution transmission electron wide angle X-ray diffraction of M-ZnO
films confirms that M-ZnO has hexagonal wurtzite structure and ternary ZnTiO
iolet–visible transmittance spectra,absorbance spectra and energy gaps of
the films were Eg of M-ZnO is intensity of M-ZnO centered at 380nm
increases obviously with the excitation power,which is due to the doping process and
enhanced emission efficiency.M-ZnO thin films display a positive photovoltaic effect
compared to mesoporous TiO 2(M-TiO 2fids Photoelectric properties
ÁMesoporous ÁZnO ÁTiO 2
1Introduction
It has been recently shown that semiconducting mesoporous metal ,SnO
2[1,2]or TiO 2[3],with large specific surface areas and uniform pore widths show
interesting properties which are superior to non porous samples of the same metal
oxide (ZnOis attracting tremendous research interest due to its vast spectrum
properties and is an n-type direct band-gap semiconductor
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with E g =3.37eV and an exciton-binding energy of has been applied for
light-emitting diodes [4–6],lasers [7],photovoltaic solar cells [8],UV-photodetectors
[9]and sensors [10].Particularly,it has attracted great attention in Dye-sensitized solar
cells (DSSC.
To date,the highest solar-to-electric conversion effi-ciency of over 11%has been
achieved with films that consist of mesoporous TiO 2nanocrystallites sensitized by ruthe-
nium-based dyes [11].Besides the optical properties similar to TiO 2,ZnO has other
advantages such as higher light absorbance below 400nm than TiO 2[12],improved elec-
tronic transfer rate and hindered dark current generation [13,14].Nevertheless,ZnO
nanostructure electrodes seem to have insufficient internal surface areas,which limits
their energy conversion efficiency at a relatively low level,for example,1.5–2.4%for ZnO
nanocrystalline films [15–17],0.5–1.5%for ZnO nanowire films [18–20],2.7–3.5%for
uniform ZnO aggregate films [21,22]and 5.4%for poly-disperse ZnO aggregates [8].
In spite of a great deal of effort to successfully synthesize mesoporous ZnO powders
successfully [23,24],however,many barriers still exist due to the intrinsic properties of
zinc versus the best of our knowledge,there were few reports about ordered
mesoporous ZnO thin film prepared by wet chemical main hurdles in the
synthesis of well-ordered mesoporous ZnO are the high reactivity of Zn ion precursors
toward hydrolysis [25]and difficulty for Zn to form the three-dimensional network
structure of Zn-O as compared to Si and Ti [26].
In this work,we report a highly reproducible synthetic method to produce thermally
stable M-ZnO films through doping process and sol–gel lectric proper-ties
of M-ZnO films were studied and compared with M-TiO 2films,which can get the highest
solar-to-electric conversion efficiency.
Á (&Á Á Á Á
2文档来源为:从网络收集整理.word版本可编辑.
2024年6月14日发(作者：万阳朔)
文档来源为:从网络收集整理.word版本可编辑.欢迎下载支持.
【关键字】论文
BRIEF COMMUNICATION
Preparation and photoelectric properties of mesoporous ZnO films
Ming Ming Wu •Yue Shen •Feng Gu •
Yi An Xie •Jian Cheng Zhang •Lin Jun Wang
Received:24June 2009/Accepted:21October 2009/Published online:6November
2009ÓSpringer Science+Business Media,LLC 2009
Abstract Mesoporous ZnO films doped with Ti 4?(M-ZnOhave been prepared by
doping process and sol–gel films have mesoporous structures and consist of
nano-crystalline phase,as evidenced from small angle X-ray diffraction and high
resolution transmission electron wide angle X-ray diffraction of M-ZnO
films confirms that M-ZnO has hexagonal wurtzite structure and ternary ZnTiO
iolet–visible transmittance spectra,absorbance spectra and energy gaps of
the films were Eg of M-ZnO is intensity of M-ZnO centered at 380nm
increases obviously with the excitation power,which is due to the doping process and
enhanced emission efficiency.M-ZnO thin films display a positive photovoltaic effect
compared to mesoporous TiO 2(M-TiO 2fids Photoelectric properties
ÁMesoporous ÁZnO ÁTiO 2
1Introduction
It has been recently shown that semiconducting mesoporous metal ,SnO
2[1,2]or TiO 2[3],with large specific surface areas and uniform pore widths show
interesting properties which are superior to non porous samples of the same metal
oxide (ZnOis attracting tremendous research interest due to its vast spectrum
properties and is an n-type direct band-gap semiconductor
1文档来源为:从网络收集整理.word版本可编辑.
文档来源为:从网络收集整理.word版本可编辑.欢迎下载支持.
with E g =3.37eV and an exciton-binding energy of has been applied for
light-emitting diodes [4–6],lasers [7],photovoltaic solar cells [8],UV-photodetectors
[9]and sensors [10].Particularly,it has attracted great attention in Dye-sensitized solar
cells (DSSC.
To date,the highest solar-to-electric conversion effi-ciency of over 11%has been
achieved with films that consist of mesoporous TiO 2nanocrystallites sensitized by ruthe-
nium-based dyes [11].Besides the optical properties similar to TiO 2,ZnO has other
advantages such as higher light absorbance below 400nm than TiO 2[12],improved elec-
tronic transfer rate and hindered dark current generation [13,14].Nevertheless,ZnO
nanostructure electrodes seem to have insufficient internal surface areas,which limits
their energy conversion efficiency at a relatively low level,for example,1.5–2.4%for ZnO
nanocrystalline films [15–17],0.5–1.5%for ZnO nanowire films [18–20],2.7–3.5%for
uniform ZnO aggregate films [21,22]and 5.4%for poly-disperse ZnO aggregates [8].
In spite of a great deal of effort to successfully synthesize mesoporous ZnO powders
successfully [23,24],however,many barriers still exist due to the intrinsic properties of
zinc versus the best of our knowledge,there were few reports about ordered
mesoporous ZnO thin film prepared by wet chemical main hurdles in the
synthesis of well-ordered mesoporous ZnO are the high reactivity of Zn ion precursors
toward hydrolysis [25]and difficulty for Zn to form the three-dimensional network
structure of Zn-O as compared to Si and Ti [26].
In this work,we report a highly reproducible synthetic method to produce thermally
stable M-ZnO films through doping process and sol–gel lectric proper-ties
of M-ZnO films were studied and compared with M-TiO 2films,which can get the highest
solar-to-electric conversion efficiency.
Á (&Á Á Á Á
2文档来源为:从网络收集整理.word版本可编辑.