Orientation-dependent energy level alignment and film growth of 2,7-diocty[1]benzothieno[3,2-b]benzothiophene (C8-BTBT) on HOPG

The Journal of Chemical Physics
Lu LyuYongli Gao

Abstract

Combining ultraviolet photoemission spectroscopy, X-ray photoemission spectroscopy, atomic force microscopy, and X-ray diffraction measurements, we performed a systematic investigation on the correlation of energy level alignment, film growth, and molecular orientation of 2,7-diocty[1]benzothieno[3,2-b]benzothiophene (C8-BTBT) on highly oriented pyrolytic graphite. The molecules lie down in the first layer and then stand up from the second layer. The ionization potential shows a sharp decrease from the lying down region to the standing up region. When C8-BTBT molecules start standing up, unconventional energy level band-bending-like shifts are observed as the film thickness increases. These shifts are ascribed to gradual decreasing of the molecular tilt angle about the substrate normal with the increasing film thickness.

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Citations

May 11, 2017·Advanced Materials·Fengjiao ZhangYing Diao
Aug 16, 2017·The Journal of Chemical Physics·Can WangYongli Gao
Nov 3, 2020·Physical Chemistry Chemical Physics : PCCP·Yuan ZhaoYongli Gao
Jun 1, 2021·The Journal of Physical Chemistry. C, Nanomaterials and Interfaces·Thomas Georg BonéPeter Puschnig
May 31, 2018·ACS Applied Materials & Interfaces·Lin LiYongli Gao

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