Subnanosecond Geminate Charge Recombination in Polymer-Polymer Photovoltaic Devices

被引：74

作者：

Hodgkiss, Justin M. ^{[1
]}

Campbell, Andrew R. ^{[1
]}

Marsh, R. Alex ^{[1
]}

Rao, Akshay ^{[1
]}

Albert-Seifried, Sebastian ^{[1
]}

Friend, Richard H. ^{[1
]}

机构：

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

来源：

PHYSICAL REVIEW LETTERS | 2010年 / 104卷 / 17期

基金：

英国工程与自然科学研究理事会;

关键词：

HETEROJUNCTION SOLAR-CELLS; PHOTOCURRENT GENERATION; NANOSCALE MORPHOLOGY; COMPOSITE FILM; SPECTROSCOPY; BLENDS; STATES;

D O I：

10.1103/PhysRevLett.104.177701

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We present direct spectroscopic evidence for substantial subnanosecond charge recombination in polymer-polymer blend photovoltaic devices. Early dynamics are dominated by exciton-charge interactions associated with high initial excitation densities. Independent of density, 30% of charges subsequently recombine geminately within just 2 nanoseconds, in contrast with fullerene blends. The remainder recombines with a half-life of similar to 200 ns. The morphological invariance of subnanosecond recombination suggests that its origin is inherent in the molecular structure at the polymer-polymer interface.

引用

页数：4

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