The electronic structure of pentacene revisited
The electronic structure of pentacene revisited
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DOI：
10.1016/j.elspec.2009.04.001
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发表时间：
2009-08-01
影响因子：
1.9
通讯作者：
Ramsey, M. G.
中科院分区：
文献类型：
--
作者：
Berkebile, S.;Koller, G.;Ramsey, M. G.
近年来，对不同基质上生长的并五苯薄膜的价带光电发射进行了研究，重点研究了最高占据分子轨道（HOMO）及其色散。在各种工作中，HOMO波段色散高达0.5 eV的证据已经被提出，甚至对于多晶薄膜也是如此。与这些结果明显矛盾的是，我们以前报道过的带色散只有50 meV。在具有单一多晶和单晶取向的特性良好的薄膜上测量。5a （0 2 2）本文首先给出了5A（0 2 2）薄膜HOMO的二维动量分布。然后比较了室温和低温生长薄膜的价带光谱的发展，我们发现形态方面可以导致明显的高HOMO色散。最后，借助HOMO的二维动量分布，我们证明了在5A（0.22）中确实存在一个相当大的色散（0.25 eV）。(C) 2009 Elsevier B.V.。
Recently, there have been reports of the valence band photoemission of pentacene films grown on various substrates with particular emphasis on the highest occupied molecular orbital (HOMO) and its dispersion. In various works, evidence for HOMO band dispersion as high as 0.5 eV, even for polycrystalline films, has been presented. In apparent contradiction to these results, we have previously reported a band dispersion of only 50 meV. measured on a well characterised film with a single polymorph and single crystalline orientation. 5A(0 2 2). Here, we first present the two-dimensional momentum distribution of the HOMO of a 5A(0 2 2) film. Then the development of the valence band spectra for films grown at room temperature and low temperature are compared, and we show that morphological aspects can lead to the apparent observation of high HOMO dispersion. Finally, with the aid of the two-dimensional momentum distribution of the HOMO, we show that a reasonably large dispersion (0.25 eV) does indeed exist in 5A(0 2 2). (C) 2009 Elsevier B.V. All rights reserved.