EFFECTS OF OXYGEN ON THE PHOTOCARRIER DYNAMICS IN A C60 FILM - STUDIES OF TRANSIENT AND STEADY-STATE PHOTOCONDUCTIVITY

被引：46

作者：

LEE, CH ^{[1
]}

YU, G ^{[1
]}

KRAABEL, B ^{[1
]}

MOSES, D ^{[1
]}

SRDANOV, VI ^{[1
]}

机构：

[1] UNIV CALIF SANTA BARBARA,CTR QUANTIZED ELECTR STRUCT,SANTA BARBARA,CA 93106

来源：

PHYSICAL REVIEW B | 1994年 / 49卷 / 15期

关键词：

D O I：

10.1103/PhysRevB.49.10572

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The intrinsic dynamics of photoexcited carriers in an oxygen-free C60 film and their remarkable evolution as the film is exposed to oxygen are revealed by transient and steady-state photoconductivity (PC) measurements at various temperatures, light intensities, and photon energies. Exposure of C60 film to oxygen creates deep traps that reduce drastically the carrier lifetime and, consequently, the room-temperature steady-state photoconductivity by three to six orders of magnitude. Oxygen affects the steady-state photoconductivity excitation spectrum in a qualitatively similar way, as does decreasing the ambient temperature; in both cases, the photoconductivity decreases faster when carriers are photoexcited into the band edges. The transient and steady-state PC of a C60 film fully exposed to oxygen becomes temperature independent.

引用

页码：10572 / 10576

页数：5

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