OPTICAL SPECTROSCOPY OF FIELD-INDUCED CHARGE IN POLY(3-HEXYL THIENYLENE) METAL-INSULATOR-SEMICONDUCTOR STRUCTURES - EVIDENCE FOR POLARONS

被引：209

作者：

ZIEMELIS, KE ^{[1
]}

HUSSAIN, AT ^{[1
]}

BRADLEY, DDC ^{[1
]}

FRIEND, RH ^{[1
]}

RUHE, J ^{[1
]}

WEGNER, G ^{[1
]}

机构：

[1] MAX PLANCK INST POLYMER RES,W-6500 MAINZ,GERMANY

来源：

PHYSICAL REVIEW LETTERS | 1991年 / 66卷 / 17期

关键词：

D O I：

10.1103/PhysRevLett.66.2231

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have fabricated metal-insulator-semiconductor structures with poly(3-hexyl thienylene) as the active semiconductor. Optical-absorption bands due to injected carriers seen near 0.4, 1.80, and 2.16 eV are assigned to the optical transitions of the singly charged polaron, which is expected to be the thermodynamically favored excitation under these experimental conditions. Additional absorption bands at 0.5 and 1.18 eV are assigned to optical transitions of doubly charged bipolarons. We contrast the strong confinement deduced for the polaron (gap states separated by 1.80 eV) with the weak confinement observed for bipolarons (gap states separated by 0.7 eV).

引用

页码：2231 / 2234

页数：4

共 19 条

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