Statistically Analyzed Photoresponse of Elastically Bent CdS Nanowires Probed by Light-Compatible In Situ High-Resolution TEM.
We demonstrate that high resolution transmission electron microscopy (HRTEM) paired with light illumination of a sample and its electrical probing can be utilized for the in situ study of initiated photocurrents in free-standing nanowires. Morphology, phase and crystallographic information from numerous individual CdS nanowires is obtained simultaneously with photocurrent measurements. Our results indicate that elastically bent CdS nanowires possessing a wurtzite structure show statistically unchanged values of ON/OFF (photocurrent/dark current) ratios. Photocurrent spectroscopy reveals red shifts of several nanometers in the cutoff wavelength after nanowire bending. This results from deformation-induced lattice strain and associated changes in the nanowire band structure, as confirmed by selected area electron diffraction (SAED) analyses and density functional tight binding (DFTB) simulations. The ON/OFF ratio stabilities and photocurrent spectroscopy shift of bent CdS nanowires are important clues for future flexible electronics, optoelectronics, and photovoltaics.
International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS) , Namiki 1-1, Tsukuba, Ibaraki 3050044, Japan.|Graduate School of Pure and Applied Sciences, Tennodai 1, University of Tsukuba , Tsukuba, Ibaraki 3058577, Japan.
Chao
C
Zhang
International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS) , Namiki 1-1, Tsukuba, Ibaraki 3050044, Japan.
Ovidiu
O
Cretu
National University of Science and Technology "MISIS" , Leninsky Prospect 4, Moscow 119049, Russian Federation.|Emanuel Institute of Biochemical Physics RAS , Kosigina st. 4, Moscow 119334, Russian Federation.
Dmitry G
DG
Kvashnin
International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS) , Namiki 1-1, Tsukuba, Ibaraki 3050044, Japan.
Naoyuki
N
Kawamoto
International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS) , Namiki 1-1, Tsukuba, Ibaraki 3050044, Japan.
Masanori
M
Mitome
School of Sciences, Beijing Jiaotong University , Beijing 100044, P. R. China.
Xi
X
Wang
International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS) , Namiki 1-1, Tsukuba, Ibaraki 3050044, Japan.
Yoshio
Y
Bando
National University of Science and Technology "MISIS" , Leninsky Prospect 4, Moscow 119049, Russian Federation.
Pavel B
PB
Sorokin
International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS) , Namiki 1-1, Tsukuba, Ibaraki 3050044, Japan.|Graduate School of Pure and Applied Sciences, Tennodai 1, University of Tsukuba , Tsukuba, Ibaraki 3058577, Japan.
Dmitri
D
Golberg
ON/OFF ratio; flexible optoelectronics; in situ TEM; photocurrent spectroscopy