Optoelectronic Properties of Orientation-controlled Lead Phthalocyanine Films
Optoelectronic Properties of Orientation-controlled Lead Phthalocyanine Films
复制标题
取向控制铅酞菁薄膜的光电性能
DOI：
10.1143/jjap.41.6421
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发表时间：
2002
影响因子：
1.5
通讯作者：
M. Nakayama
中科院分区：
文献类型：
--
作者：
K. Mizoguchi;Keizo Mizui;Daegwi Kim;M. Nakayama
我们研究了通过真空沉积制备的 (0001) 蓝宝石和 (001) KCl 基板上取向控制的铅酞菁 (PbPc) 薄膜的光电性能。 X射线衍射测量结果表明，蓝宝石和KCl衬底上的PbPc薄膜中的分子平面方向分别垂直于和平行于衬底表面。从暗和光照条件下的电流-电压特性发现，蓝宝石衬底上的PbPc薄膜的面内电导率约为KCl衬底上的20倍。这一发现表明面内电导率由分子平面取向决定，这被认为是由于它们通过 Pb 离子的一维传导性质。此外，我们根据吸收光谱和光电流光谱的结果讨论了激子对光载流子的贡献。
We investigated the optoelectronic properties of orientation-controlled lead phthalocyanine (PbPc) films on (0001) sapphire and (001) KCl substrates prepared by vacuum deposition. The results obtained from X-ray diffraction measurements indicate that the orientations of the molecular planes in the PbPc films on the sapphire and KCl substrates are perpendicular and parallel to the substrate surface, respectively. It is found from current–voltage characteristics under dark and illumination conditions that the in-plane conductivity of the PbPc film on the sapphire substrate is about 20 times as large as that on the KCl substrate. This finding indicates that the in-plane conductivity is dominated by the molecular-plane orientation, which is considered to be due to their one-dimensional conduction nature via Pb ions. Furthermore, we discuss the contribution of excitons to the photocarriers based on the results of the absorption and photocurrent spectra.