Poster Sessions

2024 KPS Spring Meeting

Wednesday-Friday, November 4-6, 2020; Virtual Conference
Session P1-ap.4: Organic electronics and photonics
1:00 PM-1:50 PM, Thursday, November 05, 2020
Room:
Chair:
Abstract: P1-ap.402* : The tunability of energy levels in the highly ordered conjugated polymer system
Presenter:
Kim Kitae
(Department of Physics, Yonsei University)

Author:
KIM Kitae 1,2, JEONG Junkyeong 1, YANG Jaehyun 1, YOO Jisu 1, PARK Soohyung 2, LEE Hyunbok 3, YI Yeonjin *1
(1Department of Physics, Yonsei University, 2Advanced Analysis Center, KIST, 3Department of Physics, Kangwon National University)
Organic semiconductors have received the great deal of attention for their advantageous properties to be applied in electronic devices such as low-cost, flexibility and ease of large-area production. The performance of the organic semiconductor devices highly depend on their energy levels, i.e. the ionization energy, electron affinity and work function, because the charge transfer properties of the device is determined by the energy level alignment at the interfaces. Recently, the controlling the orientations of organic semiconductor has been highlighted as an effective method to fine tune the their energy level alignment. However, up to now, almost all studies has been only concentrated on small molecule systems, even though the polymers occupy a large part in the field of organic semiconductor.
In this study, we controlled the orientation of Poly(3-hexylthiophene) (P3HT), a most widely used conjugated polymer, with two different deposition methods, spin-coating and vacuum electrospray. The significantly different orientation of P3HT, so called edge-on and face-on, are proven by grazing incidence wide angle x-ray scattering.  The energy levels of orientation controlled P3HT films were examined by ultraviolet photoelectron spectroscopy and showed significant different their energy level. The obtained experimental results were compared with first-principles calculations were in full consistency and support our claim.

Keyword:
Energy level, P3HT, Organic
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