NDLI: Near-Infrared Absorbing Thienoisoindigo-Based Copolymers for Organic Photovoltaics

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Near-Infrared Absorbing Thienoisoindigo-Based Copolymers for Organic Photovoltaics

Content Provider	Semantic Scholar
Author	Ide, Marina Koizumi, Yoshiko Saeki, Akinori Izumiya, Yuta Ohkita, Hideo Ito, Shinzaburo Seki, Shu
Copyright Year	2013
Abstract	We present bulk heterojunction organic photovoltaic (OPV) cells of novel electron accepting moiety, dithienoketopyrrole-based π-conjugated copolymers. An analog of isoindigo, thus so-called thienoisoindigo, was coupled to benzodithiophene, cyclopentadithiophene, and fluorene, affording a low bandgap and an appropriate LUMO level (−3.8 eV) for n-type methanofullerene (PCBM). A laser and Xe-flash-time-resolved microwave conductivity was extensively applied for guiding the processing conditions (p/n blend ratio, solvent, and thermal annealing), giving clearly defined optimized parameters. OPV performances are discussed in-depth in conjunction with atomic force microscope, grazing incidence X-ray diffraction, modulation of light intensity, field-effect transistor, and femtosecond transient absorption spectroscopy. We found that excessively shortened singlet exciton lifetime of polymer (<1 ps) competes with the photocurrent generation, which may arise from its near-infrared absorbing nature. The maximized powe...
Starting Page	26859
Ending Page	26870
Page Count	12
File Format	PDF HTM / HTML
DOI	10.1021/jp4104728
Volume Number	117
Alternate Webpage(s)	https://confit.atlas.jp/guide/event-img/jsap2014s/20a-E9-4/public/pdf?type=in
Alternate Webpage(s)	https://doi.org/10.1021/jp4104728
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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