Charge carrier generation in a dye sensitized liquid crystal

Autor:	Roland Bilke, Andreas Schreiber, Ingo Bleyl, D. Haarer, Dieter Adam
Rok vydání:	2000
Předmět:	Double layer (biology) Photocurrent Light intensity Liquid crystal Chemistry Exciton Photoconductivity General Physics and Astronomy Quantum efficiency Charge carrier Photochemistry
Zdroj:	Journal of Applied Physics. 87:3872-3877
ISSN:	1089-7550 0021-8979
DOI:	10.1063/1.372427
Popis:	The photocarrier generation and recombination mechanism in double layer cells of dye sensitized liquid crystalline hexahexylthiotriphenylene (HHTT) have been studied by steady-state photoconduction measurements. From the dependence of the photocurrent on light intensity we could determine the charge carrier generation mechanism in an azo pigment 4,4’-[(2,5-diphenyl1,3,4-oxadiazol)-bis(azo)]-bis[3-hydroxy-(2H-benzimidazo[2,1-a]benz[d,e]isoquinolin-7-one)] as surface enhanced whereas in titanylphthalocyanine charge generation takes place in the bulk of the dye. We investigated the actionspectra of a single HHTT cell and an azo sensitized cell in the different phases of HHTT to show the influence of azo on the spectral response of the photocurrent. The quantum efficiency in a single HHTT cell as well as in a double layer cell with azo as charge generation layer was determined. By solving the diffusion equation for excitons we carried out an estimation of the exciton diffusion length in azo.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::e60e8f41735c6c74d6576ae4254769c0 https://doi.org/10.1063/1.372427 Zobrazit plný text záznamu