TY - JOUR
T1 - Electronic properties associated with conformational changes in azobenzene-derivative molecular junctions
AU - Kim, Yonghun
AU - Wang, Gunuk
AU - Choe, Minhyeok
AU - Kim, Juhwan
AU - Lee, Sangchul
AU - Park, Sungjun
AU - Kim, Dong Yu
AU - Lee, Byoung Hun
AU - Lee, Takhee
N1 - Funding Information:
This work was supported by the National Research Laboratory program; a Korean National Core Research Centre grant ; the World Class University program of the Korean Ministry of Education, Science, and Technology; the Program for Integrated Molecular Systems at GIST. We thank Ja Min Koo and Yun Hee Jang for discussions throughout this study.
PY - 2011/12
Y1 - 2011/12
N2 - The electronic properties of azobenzene-derivative ([4-(phenylazo)phenoxy] hexane-1-thiol) molecular junctions were studied in terms of their molecular configurations with vertical device structure as solid-state device platform. This molecule has two distinct molecular configurations (trans- and cis-isomer) depending on the wavelength of irradiating light, which converts from more thermodynamically stable trans-isomer to cis-isomer under UV exposure (∼365 nm) and reversible photoisomerization of cis-isomer to trans-isomer under visible light (400-500 nm). The two states showed that the conductance of cis-isomer (compact form) was higher than that of trans-isomer (extended form). From the temperature-variable electrical characterization, the main charge conduction mechanism for the two isomers was found to be tunneling. And, from the transition voltage spectroscopy analysis and ultraviolet photoelectron spectroscopy measurement, the origin of such result can be explained by reduction of molecular tunneling distance between two isomers.
AB - The electronic properties of azobenzene-derivative ([4-(phenylazo)phenoxy] hexane-1-thiol) molecular junctions were studied in terms of their molecular configurations with vertical device structure as solid-state device platform. This molecule has two distinct molecular configurations (trans- and cis-isomer) depending on the wavelength of irradiating light, which converts from more thermodynamically stable trans-isomer to cis-isomer under UV exposure (∼365 nm) and reversible photoisomerization of cis-isomer to trans-isomer under visible light (400-500 nm). The two states showed that the conductance of cis-isomer (compact form) was higher than that of trans-isomer (extended form). From the temperature-variable electrical characterization, the main charge conduction mechanism for the two isomers was found to be tunneling. And, from the transition voltage spectroscopy analysis and ultraviolet photoelectron spectroscopy measurement, the origin of such result can be explained by reduction of molecular tunneling distance between two isomers.
KW - Azobenzene
KW - Molecular configuration
KW - Molecular electronic devices
KW - Photoisomerization
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U2 - 10.1016/j.orgel.2011.08.017
DO - 10.1016/j.orgel.2011.08.017
M3 - Article
AN - SCOPUS:80053588330
VL - 12
SP - 2144
EP - 2150
JO - Organic Electronics: physics, materials, applications
JF - Organic Electronics: physics, materials, applications
SN - 1566-1199
IS - 12
ER -