Carrier injection dynamics in heterojunction solar cells with bipolar molecule | Zendy

Yosuke Takahashi | Zendy; Takeshi Yasuda | Zendy; Kouhei Yonezawa | Zendy; Yutaka Moritomo | Zendy

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Carrier injection dynamics in heterojunction solar cells with bipolar molecule

Author(s) -

Yosuke Takahashi,

Takeshi Yasuda,

Kouhei Yonezawa,

Yutaka Moritomo

Publication year - 2015

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 - 10.1063/1.4914918

Subject(s) - heterojunction , materials science , boron , optoelectronics , exciton , diffusion , acceptor , layer (electronics) , femtosecond , organic solar cell , charge carrier , electron , analytical chemistry (journal) , chemistry , nanotechnology , condensed matter physics , optics , polymer , laser , physics , organic chemistry , composite material , quantum mechanics , thermodynamics , chromatography

A boron subphthalocyanine chloride (SubPc) is a bipolar molecule and is used in hetero-junction organic solar cells. Here, we investigated the carrier injection dynamics from the donor α-sexithiophene (6T) or acceptor C60 layers to the bipolar SubPc layer by means of the femtosecond time-resolved spectroscopy. We observed gradual increase of the SubPc– (SubPc+) species within ≈300 ps. The increases are interpreted in terms of the exciton diffusion within the 6T (C60) layer and subsequent electron (hole) injection at the interface. In 6T/SubPc heterojunction, the electron injection is observed even at 80 K. The robust electron injection is ascribed to the efficient charge separation within the 6T layer under photo exciation at 400 nm

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