ON CHARGE CARRIER PHOTOGENERATION MECHANISMS IN ORGANIC MOLECULAR-CRYSTALS

被引：16

作者：

SILINSH, EA ^{[1
]}

INOKUCHI, H ^{[1
]}

机构：

[1] RIGA PHYS & ENERGET INST,RIGA 226006,LATVIA,USSR

来源：

CHEMICAL PHYSICS | 1991年 / 149卷 / 03期

关键词：

D O I：

10.1016/0301-0104(91)90037-T

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Photoconductivity spectral characteristics in polyacene crystals are reported which may be interpreted in terms of two possible autoionization mechanisms, viz. direct ionization of photoexcited neutral molecular states and/or autoionization from fixed electronic levels after intramolecular vibronic relaxation. It is shown that the step-like character of the spectral dependence of the photogeneration activation energy E(a)ph (hv) allows the determination of the dominant autoionization mechanism in a given spectral range, while the structure of the intrinsic photoconductivity quantum efficiency-eta-(hv) curves indicates the energy values at which the excitation from lower-lying valence levels begin to switch on. The relaxation kinetics of both competitive autoionization channels are discussed.

引用

页码：373 / 383

页数：11

共 31 条

[21]

POPE M, 1982, ELECTRONIC PROCESSES

[22] PHOTOELECTRON SPECTROSCOPIC EVIDENCE FOR THE COMPETITION OF IONIZATION AND INTERNAL-CONVERSION AT THE S-2 EXCITED-STATE OF TRIMETHYLAMINE [J].