Effect of molecular desorption on the electronic properties of self-assembled polarizable molecular monolayers.
We investigated the interfacial electronic properties of self-assembled monolayers (SAM)-modified Au metal surface at elevated temperatures. We observed that the work functions of the Au metal surfaces modified with SAMs changed differently under elevated-temperature conditions based on the type of SAMs categorized by three different features based on chemical anchoring group, molecular backbone structure, and the direction of the dipole moment. The temperature-dependent work function of the SAM-modified Au metal could be explained in terms of the molecular binding energy and the thermal stability of the SAMs, which were investigated with thermal desorption spectroscopic measurements and were explained with molecular modeling. Our study will aid in understanding the electronic properties at the interface between SAMs and metals in organic electronic devices if an annealing treatment is applied.
Department of Chemistry and the Smalley Institute for Nanoscale Science and Technology, Rice University, Houston, TX 77005, USA; School of Materials Science and Engineering, Gwangju Institute of Science and Technology, Gwangju 500-712, Republic of Korea.
Gunuk
G
Wang
Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Republic of Korea.
Hyunhak
H
Jeong
School of Materials Science and Engineering, Gwangju Institute of Science and Technology, Gwangju 500-712, Republic of Korea.
Jamin
J
Ku
School of Flexible and Printable Electronics, Chonbuk National University, Jeonju-si, Jeollabuk-do 561-756, Republic of Korea.
Seok-In
SI
Na
Department of Chemistry, Hanyang University, Seoul 133-791, Republic of Korea.
Hungu
H
Kang
Flucto-Order Functions Research Team, RIKEN-HYU Collaboration Center, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.
Eisuke
E
Ito
School of Materials Science and Engineering, Gwangju Institute of Science and Technology, Gwangju 500-712, Republic of Korea.
Yun Hee
YH
Jang
Department of Chemistry, Hanyang University, Seoul 133-791, Republic of Korea. Electronic address: jgnoh@hanyang.ac.kr.
Jaegeun
J
Noh
Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Republic of Korea. Electronic address: tlee@snu.ac.kr.
Takhee
T
Lee
Dipole moment; Self-assembled monolayer; Thermal desorption; Work function