Carrier formation dynamics of a small-molecular organic photovoltaic | Zendy

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

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Carrier formation dynamics of a small-molecular organic photovoltaic

Author(s) -

Takahiro Akaba,

Kouhei Yonezawa,

Hayato Kamioka,

Takeshi Yasuda,

Liyuan Han,

Yutaka Moritomo

Publication year - 2013

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.182

H-Index - 442

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.4800532

Subject(s) - exciton , band gap , organic solar cell , absorption spectroscopy , energy conversion efficiency , molecular dynamics , absorption (acoustics) , acceptor , photochemistry , chemistry , heterojunction , materials science , solar cell , analytical chemistry (journal) , optoelectronics , computational chemistry , organic chemistry , optics , polymer , physics , condensed matter physics , composite material

We investigated carrier formation dynamics in a small-molecular bulk heterojunction solar cell, 2,5-di-(2-ethylhexyl)-3,6-bis-(5″-n-hexy-[2,2′,5′,2″]terthiophen-5-yl)-pyrrolo[3,4-c]pyrrolo-1,4-dione/[6,6]-phenyl C71-butyric acid methyl ester, with low bandgap (Egap ≈ 1.5 eV). The photoinduced absorption (PIA) spectra of the blend film were decomposed into three PIAs, i.e., those due to donor exciton (D*), acceptor exciton (A*), and mobile carrier (D+). The analysis revealed carrier conversion from D* with a conversion time of ∼1.3 ps

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