Charge-carrier injection into CuPc thin films:: a scanning tunneling microscopy study

被引：35

作者：

Alvarado, SF ^{[1
]}

Rossi, L ^{[1
]}

Müller, P ^{[1
]}

Riess, W ^{[1
]}

机构：

[1] IBM Res Corp, Zurich Res Lab, CH-8803 Ruschlikon, Switzerland

来源：

SYNTHETIC METALS | 2001年 / 122卷 / 01期

关键词：

copper phthalocyanine; charge-carrier injection barrier; scanning tunnel microscopy; spectroscopy;

D O I：

10.1016/S0379-6779(00)01372-2

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Injection of charge carriers into the LUMO and HOMO levels of copper phthalocyanine (CuPc) is investigated by scanning tunneling microscopy (STM) and spectroscopy. The threshold for injection of charge carriers emitted by the tip of the STM allows us to determine the so-called single-particle band gap (E-gsp) Of CuPc polymorphs as well as the band edge alignment with respect to the Fermi level of the Au(1 1 1) substrate. We find E-gsp values significantly lower than the optical band gap. This indicates the presence of intermolecular interactions, giving rise to in-gap states that can play a predominant role in controlling injection as well as transport properties. The lowest value of E-gsp is found for the crystalline phases of CuPc obtained by thermal annealing, whereas the largest band gap and inferior charge transport properties are found for samples grown on substrates at room temperature. (C) 2001 Elsevier Science B.V. All rights reserved.

引用

页码：73 / 77

页数：5

共 36 条

[1] Direct determination of the exciton binding energy of conjugated polymers using a scanning tunneling microscope [J].

Alvarado, SF ;

Seidler, PF ;

Lidzey, DG ;

Bradley, DDC .

PHYSICAL REVIEW LETTERS, 1998, 81 (05) :1082-1085

[2]

ALVARADO SF, IN PRESS IBM J RES D

[3] SCANNING TUNNELING MICROSCOPY OBSERVATIONS ON THE RECONSTRUCTED AU(111) SURFACE - ATOMIC-STRUCTURE, LONG-RANGE SUPERSTRUCTURE, ROTATIONAL DOMAINS, AND SURFACE-DEFECTS [J].

BARTH, JV ;

BRUNE, H ;

ERTL, G ;

BEHM, RJ .

PHYSICAL REVIEW B, 1990, 42 (15) :9307-9318

[4] SURFACE-STRUCTURES OF PHTHALOCYANINE MONOLAYERS AND VAPOR-GROWN FILMS - LOW-ENERGY ELECTRON-DIFFRACTION STUDY [J].

BUCHHOLZ, JC ;

SOMORJAI, GA .

JOURNAL OF CHEMICAL PHYSICS, 1977, 66 (02) :573-580

[5] THEORETICAL-STUDY OF THE ELECTRICAL BEHAVIOR OF ONE-DIMENSIONAL METALLOPHTHALOCYANINES AND RELATED METALLOMACROCYCLIC COMPOUNDS [J].

CANADELL, E ;

ALVAREZ, S .

INORGANIC CHEMISTRY, 1984, 23 (05) :573-579

[6] Band alignment at organic-inorganic semiconductor interfaces:: α-NPD and CuPc on InP(110) [J].

Chassé, T ;

Wu, CI ;

Hill, IG ;

Kahn, A .

JOURNAL OF APPLIED PHYSICS, 1999, 85 (09) :6589-6592

[7]

CHEN CJ, 1993, INTRO SCANNING TUNNE, P21

[8] STM imaging and spectroscopy of single copperphthalocyanine molecules [J].

Dekker, C ;

Tans, SJ ;

Oberndorff, B ;

Meyer, R ;

Venema, LC .

SYNTHETIC METALS, 1997, 84 (1-3) :853-854

[9] TUNNELING SPECTROSCOPY OF THE (110)-SURFACE OF DIRECT-GAP III-V SEMICONDUCTORS [J].

FEENSTRA, RM .

PHYSICAL REVIEW B, 1994, 50 (07) :4561-4570

[10] Organic electroluminescent devices by high-temperature processing and crystalline hole transporting layer [J].

Gao, ZQ ;

Lai, WY ;

Wong, TC ;

Lee, CS ;

Bello, I ;

Lee, ST .

APPLIED PHYSICS LETTERS, 1999, 74 (22) :3269-3271

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