PHOTOCURRENT MEASUREMENTS ON AGGREGATES IN LADDER-TYPE POLY(P-PHENYLENE)

被引：68

作者：

KOHLER, A ^{[1
]}

GRUNER, J ^{[1
]}

FRIEND, RH ^{[1
]}

MULLEN, K ^{[1
]}

SCHERF, U ^{[1
]}

机构：

[1] MAX PLANCK INST POLYMER RES,D-55128 MAINZ,GERMANY

来源：

CHEMICAL PHYSICS LETTERS | 1995年 / 243卷 / 5-6期

关键词：

D O I：

10.1016/0009-2614(95)00840-Z

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：

We report measurements of the photovoltaic effect on single layer devices made with a ladder-type poly-(paraphenylene) (LPPP). Besides the photocurrent in the blue spectral range associated with pi to pi* intra-chain absorption we observe an additional response in the yellow part of the spectrum centred at 2.25 eV. We also observe a weak absorption feature at the same energy, and we consider that both arise from absorption into pi electron states formed over several aggregated polymer chains. The photocurrent due to excitation of these states is enhanced by two orders of magnitude compared to blue excitation and vanishes under reverse bias (i.e. ITO negative). We find that the photocurrent response due to the aggregate states is more sensitive to oxygen exposure than the response due to intra-chain absorption.

引用

页码：456 / 461

页数：6

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