DOPING EFFECTS IN THIN-FILMS OF RADICAL PHTHALOCYANINES - UPS AND CONDUCTIVITY STUDIES

被引：11

作者：

BUFLER, J

ZIEGLER, C

GOPEL, W

机构：

[1] Institute of Physical and Theoretical Chemistry, University of Tübingen, 72076 Tübingen, Auf der Morgenstelle 8, D(W)

来源：

SYNTHETIC METALS | 1993年 / 61卷 / 1-2期

关键词：

D O I：

10.1016/0379-6779(93)91209-K

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The influence of dopants on the electronic structure and the electrical properties of the radical phthalocyanines LuPc2 and LiPc are investigated. Oxygen and hydrogen act as irreversible 'dopants' which slightly decrease the conductivity of thin films. The influence of H-2 and other dopants added by gas phase reactions (i.e., Cl2 and I2) or by electrochemical treatment on the electronic structure is studied by ultraviolet photoemission spectroscopy (UPS). Particular emphasis is placed on the determination of occupied and unoccupied electronic states around the Fermi level. Upon oxidation of LuPc2 and LiPc, the singlet electron in the semi-occupied HOMO ('SOMO') is removed. Upon reduction, a doubly occupied HOMO is found. Pronounced changes in the conductivity are found after heat treatment of films under UHV conditions. These changes correlate with sintering effects and variations in the grain structure at T greater-than-or-equal-to 450 K.

引用

页码：127 / 131

页数：5

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