Bis(triisopropylsilylethynyl)pentacene/Au(111) Interface: Coupling, Molecular Orientation, and Thermal Stability

被引:12
|
作者
Gnoli, Andrea [1 ]
Ustunel, Hande [2 ]
Toffoli, Daniele [3 ]
Yu, Liyang [4 ]
Catone, Daniele [5 ]
Turchini, Stefano [5 ]
Lizzit, Silvano [6 ]
Stingelin, Natalie [7 ]
Larciprete, Rosanna [1 ]
机构
[1] CNR, ISC, I-00133 Rome, Italy
[2] Middle E Tech Univ, Dept Phys, TR-06531 Ankara, Turkey
[3] Middle E Tech Univ, Dept Chem, TR-06531 Ankara, Turkey
[4] King Abdullah Univ Sci & Technol, Thuwal 239556900, Saudi Arabia
[5] CNR, ISM, I-00133 Rome, Italy
[6] Elettra Sincrotrone Trieste SCpA, I-34149 Trieste, Italy
[7] Univ London Imperial Coll Sci Technol & Med, Dept Mat, London SW7 2AZ, England
来源
JOURNAL OF PHYSICAL CHEMISTRY C | 2014年 / 118卷 / 39期
关键词
ZN-TETRAPHENYL-PORPHYRIN; PENTACENE FILMS; X-RAY; FUNCTIONALIZED ACENES; ELECTRONIC-PROPERTIES; EPITAXIAL-GROWTH; CHARGE-TRANSPORT; SINGLE-CRYSTAL; THIN-FILMS; NEXAFS;
D O I
10.1021/jp504401v
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The assembly and the orientation of functionalized pentacene at the interface with inorganics strongly influence both the electric contact and the charge transport in organic electronic devices. In this study electronic spectroscopies and theoretical modeling are combined to investigate the properties of the bis(triisopropylsilylethynyl)pentacene (TIPS-Pc)/Au(111) interface as a function of the molecular coverage to compare the molecular state in the gas phase and in the adsorbed phase and to determine the thermal stability of TIPS-Pc in contact with gold. Our results show that in the free molecule only the acene atoms directly bonded to the ligands are affected by the functionalization. Adsorption on Au(111) leads to a weak coupling which causes only modest binding energy shifts in the TIPS-Pc and substrate core level spectra. In the first monolayer the acene plane form an angle of 33 +/- 2 degrees with the Au(111) surface at variance with the vertical geometry reported for thicker solution-processed or evaporated films, whereas the presence of configurational disorder was observed in the multilayer. The thermal annealing of the TIPS-Pc/Au(111) interface reveals the ligand desorption at similar to 470 K, which leaves the backbone of the decomposed molecule flat-lying on the metal surface as in the case of the unmodified pentacene. The weak interaction with the metal substrate causes the molecular dissociation to occur 60 K below the thermal decomposition taking place in thick drop-cast films.
引用
收藏
页码:22522 / 22532
页数:11
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