An investigation of organic photovoltaics improvement via extension of the exciton lifetime

En Ping Yao; Yi Jhe Tsai; Wei Chou Hsu

doi:10.1039/c4cp05459h

An investigation of organic photovoltaics improvement via extension of the exciton lifetime

En Ping Yao, Yi Jhe Tsai, Wei Chou Hsu

Research output: Contribution to journal › Article › peer-review

8 Citations (Scopus)

Abstract

The phosphorescent material tris(phenylpyrazole)iridium (Ir(ppz)₃) was doped into the bulk heterojunction (BHJ) layer of a 3-hexylthiophene-2,5-diyl and indene-C60 bisadduct blend to form more excitons in the triplet state. Triplet-state excitons have longer lifetimes than singlet-state excitons. Surface phase separation was determined via atomic force microscopy and the vertical distribution of various molecules was analyzed via secondary ion mass spectroscopy. Several annealing processes were applied to the BHJ layer doped with Ir(ppz)₃ to investigate the thermal stability of the film. The exciton lifetime in the BHJ film was characterized using femtosecond time-reserved photoluminescence.

Original language	English
Pages (from-to)	5826-5831
Number of pages	6
Journal	Physical Chemistry Chemical Physics
Volume	17
Issue number	8
DOIs	https://doi.org/10.1039/c4cp05459h
Publication status	Published - 2015 Feb

All Science Journal Classification (ASJC) codes

General Physics and Astronomy
Physical and Theoretical Chemistry

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title = "An investigation of organic photovoltaics improvement via extension of the exciton lifetime",

abstract = "The phosphorescent material tris(phenylpyrazole)iridium (Ir(ppz)3) was doped into the bulk heterojunction (BHJ) layer of a 3-hexylthiophene-2,5-diyl and indene-C60 bisadduct blend to form more excitons in the triplet state. Triplet-state excitons have longer lifetimes than singlet-state excitons. Surface phase separation was determined via atomic force microscopy and the vertical distribution of various molecules was analyzed via secondary ion mass spectroscopy. Several annealing processes were applied to the BHJ layer doped with Ir(ppz)3 to investigate the thermal stability of the film. The exciton lifetime in the BHJ film was characterized using femtosecond time-reserved photoluminescence.",

author = "Yao, {En Ping} and Tsai, {Yi Jhe} and Hsu, {Wei Chou}",

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T1 - An investigation of organic photovoltaics improvement via extension of the exciton lifetime

AU - Yao, En Ping

AU - Tsai, Yi Jhe

AU - Hsu, Wei Chou

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PY - 2015/2

Y1 - 2015/2

N2 - The phosphorescent material tris(phenylpyrazole)iridium (Ir(ppz)3) was doped into the bulk heterojunction (BHJ) layer of a 3-hexylthiophene-2,5-diyl and indene-C60 bisadduct blend to form more excitons in the triplet state. Triplet-state excitons have longer lifetimes than singlet-state excitons. Surface phase separation was determined via atomic force microscopy and the vertical distribution of various molecules was analyzed via secondary ion mass spectroscopy. Several annealing processes were applied to the BHJ layer doped with Ir(ppz)3 to investigate the thermal stability of the film. The exciton lifetime in the BHJ film was characterized using femtosecond time-reserved photoluminescence.

AB - The phosphorescent material tris(phenylpyrazole)iridium (Ir(ppz)3) was doped into the bulk heterojunction (BHJ) layer of a 3-hexylthiophene-2,5-diyl and indene-C60 bisadduct blend to form more excitons in the triplet state. Triplet-state excitons have longer lifetimes than singlet-state excitons. Surface phase separation was determined via atomic force microscopy and the vertical distribution of various molecules was analyzed via secondary ion mass spectroscopy. Several annealing processes were applied to the BHJ layer doped with Ir(ppz)3 to investigate the thermal stability of the film. The exciton lifetime in the BHJ film was characterized using femtosecond time-reserved photoluminescence.

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An investigation of organic photovoltaics improvement via extension of the exciton lifetime

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