Exciton regeneration at polymeric semiconductor heterojunctions

被引：343

作者：

Morteani, AC ^{[1
]}

Sreearunothai, P ^{[1
]}

Herz, LM ^{[1
]}

Friend, RH ^{[1
]}

Silva, C ^{[1
]}

机构：

[1] Univ Cambridge, Cavendish Lab, Cambridge CB3 0HE, England

来源：

PHYSICAL REVIEW LETTERS | 2004年 / 92卷 / 24期

基金：

英国工程与自然科学研究理事会;

关键词：

D O I：

10.1103/PhysRevLett.92.247402

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Control of the band-edge offsets at heterojunctions between organic semiconductors allows efficient operation of either photovoltaic or light-emitting diodes. We investigate systems where the exciton is marginally stable against charge separation and show via E-field-dependent time-resolved photoluminescence spectroscopy that excitons that have undergone charge separation at a heterojunction can be efficiently regenerated. This is because the charge transfer produces a geminate electron-hole pair (separation 2.2-3.1 nm) which may collapse into an exciplex and then endothermically (E-A=100-200 meV) back transfer towards the exciton.

引用

页码：247402 / 1

页数：4

共 20 条

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