Journal
JOURNAL OF PHYSICS-CONDENSED MATTER
Volume 28, Issue 9, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0953-8984/28/9/094005
Keywords
pentacene; energy-level alignment; photoelectron spectroscopy; organic thin film
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Funding
- Major State Basic Research Development Program of China (973 Program) [2013CB933500, 2014CB932600]
- Jiangsu province technology fund [BK20141188]
- Collaborative Innovation Center of Suzhou Nano Science & Technology (NANO-CIC)
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We measured the electronic and the molecular surface structure of pentacene deposited on the (1 1 1)-surfaces of coinage metals by means of ultraviolet photoelectron spectroscopy (UPS) and low-energy electron diffraction (LEED). Pentacene is almost flat-lying in monolayers on all three substrates and highly ordered on Au(1 1 1) and on Cu(1 1 1). On Ag(1 1 1), however, weak chemisorption leads to almost disordered monolayers, both, at room temperature and at 78 K. On Cu(1 1 1) pentacene is strongly chemisorbed and the lowest unoccupied molecular orbital becomes observable in UPS by a charge transfer from the substrate. On Ag(1 1 1) and Cu(1 1 1) multilayers adopt a tilted orientation and a high degree of crystallinity. On Au(1 1 1), most likely, also in multilayers the molecular short and long axes are parallel to the substrate, leading to a distinctively different electronic structure than on Ag(1 1 1) and Cu(1 1 1). Overall, it could be demonstrated that the substrate not only determines the geometric and electronic characteristics of molecular monolayer films but also plays a crucial role for multilayer film growth.
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