Charge transport in a blue-emitting alternating block copolymer with a small spacer to conjugated segment length ratio


Autoria(s): Ma D; Hummelgen IA; Jing XB; Hong ZY; Wang LX; Zhao XJ; Wang FS; Karasz FE
Data(s)

2000

Resumo

We analyze current versus voltage data obtained using single carrier injection in several metal/polymer/metal sandwich structures. The polymer used in each case is a soluble blue-emitting alternating block copolymer. Our experimental results demonstrate that the electron transport is space-charge limited by the high density of traps having an exponential energy distribution (temperature dependent characteristic energy) in the copolymer. The electron mobility of 8x10(-10) cm(2)/V s is directly determined using space-charge-limited current analytical expressions. Hole transport is also space-charge limited, with a mobility of 2x10(-6) cm(2)/V s. A hole trap with energy 0.17 eV is observed. We compare these results with those obtained for related block copolymers with different spacer and conjugated segment lengths and discuss the influence of spacer length and conjugated segment length on the charge transport properties. (C) 2000 American Institute of Physics. [S0021-8979(00)04501-1].

Identificador

http://202.98.16.49/handle/322003/19951

http://www.irgrid.ac.cn/handle/1471x/154710

Idioma(s)

英语

Fonte

Ma D;Hummelgen IA;Jing XB;Hong ZY;Wang LX;Zhao XJ;Wang FS;Karasz FE.Charge transport in a blue-emitting alternating block copolymer with a small spacer to conjugated segment length ratio,JOURNAL OF APPLIED PHYSICS,2000,87(1):312-316

Palavras-Chave #MOLECULARLY DOPED POLYMERS #POLY(P-PHENYLENE VINYLENE) #DEVICES #DIODES
Tipo

期刊论文