Robust carrier formation process in low-band gap organic photovoltaics | Zendy

Kouhei Yonezawa | Zendy; Hayato Kamioka | Zendy; Takeshi Yasuda | Zendy; Liyuan Han | Zendy; Yutaka Moritomo | Zendy

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Robust carrier formation process in low-band gap organic photovoltaics

Author(s) -

Kouhei Yonezawa,

Hayato Kamioka,

Takeshi Yasuda,

Liyuan Han,

Yutaka Moritomo

Publication year - 2013

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.4826187

Subject(s) - organic solar cell , charge carrier , energy conversion efficiency , quantum efficiency , band gap , materials science , photovoltaics , photovoltaic system , photochemistry , chemical engineering , analytical chemistry (journal) , chemistry , optoelectronics , organic chemistry , polymer , engineering , ecology , composite material , biology

By means of femto-second time-resolved spectroscopy, we investigated the carrier formation process against film morphology and temperature (T) in highly-efficient organic photovoltaic, poly[[4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-b:4,5- ] dithiophene-2,6-diyl][3-fluoro-2-[(2-ethylhexyl)carbonyl]thieno[3,4-b] thiophenediyl]] (PTB7)/[6,6]-phenyl -butyric acid methyl ester solar cells. We found that the carrier formation efficiency ( ) from an absorbed photon is nearly independent of the film morphology, indicating that the internal quantum efficiency ( ) is mainly governed by the carrier transfer efficiency ( ) to the electrodes. The activation energy ( ) of is significantly low, which suggests an extended charge-transfer state around the PTB7/PC70BM interface

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