PHOTOCONDUCTION IN POLY(3-ALKYLTHIOPHENE) .1. CHARGE CARRIER GENERATION

被引:43
作者
BINH, NT [1 ]
GAILBERGER, M [1 ]
BASSLER, H [1 ]
机构
[1] UNIV MARBURG,ZENTRUM MAT WISSENSCH,W-3550 MARBURG,GERMANY
关键词
D O I
10.1016/0379-6779(92)90333-E
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Light-induced charge carrier generation has been investigated in Al/poly(3-dodecylthiophene)\Al sandwich structures. Upon pulse excitation the yield is temperature and field dependent in accord with 1D Onsager theory and saturates at phi congruent-to 0.3. Disorder-aided dissociation of Frenkel excitons is invoked. D.c. photocurrents are oxygen sensitive. The yield can exceed unity at high fields due to forced hole injection across the Al2O3 interface under the action of a surface potential. The potential is established by accumulating O2- ions generated in the course of exciton dissociation in the bulk.
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页码:77 / 86
页数:10
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