Electronic structure of bis(benzo)pentathienoacene in gas and?solid phase: ultraviolet photoemission spectroscopy and?energy?band?calculation

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• 作者：Hiroyuki Yoshida ; Yuji Watazu ; Naoki Sato ; Toshihiro Okamoto and Shigehiro Yamaguchi
• 关键词：PACS 79.60.Fr ; 71.20.Rv ; 73.61.Ph ; 72.80.Le
• 刊名：Applied Physics A: Materials Science & Processing
• 出版年：2009
• 出版时间：April, 2009
• 年：2009
• 卷：95
• 期：1
• 页码：185-191
• 全文大小：562.0 KB

文摘

Ultraviolet photoemission spectroscopic measurements of bis (benzo)pentathienoacene were carried out in gas and solid phase. For the measurements of solid phase, vacuum deposited films in both amorphous and crystalline phase were prepared on different substrates of HOPG and polycrystalline Au, respectively. The adiabatic ionization energies were determined to be 6.8₄, 5.3₂, and 5.0₈ eV, for gas, amorphous, and crystalline phases, respectively. The spectral lineshapes were interpreted with the aid of the density functional calculations for both isolated molecule and single-crystal structure. The calculated electronic structures were further analyzed in terms of the energy band dispersion and the transport properties of charge carriers.