Effects of Side Chains on Thiazolothiazole‐Based Copolymer Semiconductors for High Performance Solar Cells

Subramaniyan, Selvam; Xin, Hao; Kim, Felix Sunjoo; Shoaee, Safa; Durrant, James R.; Jenekhe, Samson A.

doi:10.1002/aenm.201100215

Cited by 190 publications

(177 citation statements)

References 42 publications

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“…Literature data show that the fullerene exciton absorption near 1.7 eV is dominated by a single peak and that the photoluminescence spectrum has a peak at about the same energy and with only a weak phonon sideband. 20 We can therefore conclude that the main peak is the zero-phonon energy and that the reorganization energy is small enough to be negligible. Again we do not know the exciton binding energy and estimate a value of 0.2 eV in recognition that the fullerene dielectric constant of roughly 4 is considerably larger than that of the polymers and hence the Coulomb component of the exciton binding energy should be smaller.…”

Section: Background and Measurement Methodologymentioning

confidence: 99%

Electronic Structure and Transition Energies in Polymer–Fullerene Bulk Heterojunctions

et al. 2014

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Photocurrent spectroscopy is used to measure both the charge transfer and exciton optical absorption spectra of various bulk heterojunction organic solar cells. The energy difference between the polymer HOMO energy and the fullerene LUMO energy is obtained from the spectra, along with the disorder energy. Combining information from cells with several different polymers and fullerenes allows measurements of the energy differences between HOMO or LUMO energies for about 10 different polymers and fullerenes, with an estimated uncertainty of 50 meV. Heterojunction band offsets are obtained for the various cells, distinguishing between the excitonic and the single-carrier band offsets. The cell open-circuit voltage is shown to be closely correlated with the interface band gap. The exciton disorder energy is directly correlated to the band-tail disorder and we also consider the effects of exciton thermalization on the charge generation mechanism. The data indicate that an energy offset between the polymer exciton and the charge transfer ground state below about 0.25 eV adversely affects the cell performance, while a HOMO band offset below about 0.2−0.3 eV also degrades cell performance but by a different mechanism.

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Section: Background and Measurement Methodologymentioning

confidence: 99%

Electronic Structure and Transition Energies in Polymer–Fullerene Bulk Heterojunctions

et al. 2014

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“…15,[20][21][22][23][24][25][26][27][28][29][30] We have reported on a series of TzTz-based polymers with alkylthiophenes as the donor unit. 15,[20][21][22][23]31,32 One of the highest performing polymers was PTzBT-BOHD (Fig.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of an Alkoxythiazole-thiazolothiazole Semiconducting Polymer for Organic Solar Cells

Saito

Osaka

2017

Electrochemistry

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We report the synthesis and characterization of a new thiazolothiazole (TzTz)-based semiconducting polymer incorporating the alkoxythiazole unit in the polymer backbone (PTzTTz-BOoHD). The introduction of the alkoxythiazole unit in a thiophene-TzTz polymer (PTzBT-BOHD) lowered the LUMO energy level while keeping the HOMO energy level, resulting in a narrower bandgap. The solar cell with PTzTTz-BOoHD showed photoresponse in a wider spectral range (~740 nm) compared to that with PTzBT-BOHD and with a thiophene-TzTz polymer having the alkoxy thiophene unit (PTzBT-BOoHD). Although the fill factor (FF) of the cell based on PTzTTz-BOoHD was lower than the cell based on PTzBT-BOHD and -BOoHD, the maximum PCE of the cell based on PTzTTz-BOoHD resulted in 6.2%, which was comparable to and higher than the cell based on PTzBT-BOHD and -BOoHD, respectively. While PTzTTz-BOoHD showed good crystallinity in the polymer film, it was reduced in the film blended with PC 61 BM, which is likely an origin of the drop of FF. As PTzTTz-BOoHD has more suitable electronic structures for solar cells such as a deep HOMO level and a narrow bandgap, compared to the other two polymers, we expect that PTzTTz-BOoHD would demonstrate higher PCE by further device optimization.

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“…[4][5][6][7][8] DTS exhibits enhanced conjugation due to the orbital interaction between the silicon s-bonds and the bithiophene p-system, as well as a highly planar tricyclic structure. 9 Recently, several D-A-type compounds and polymers containing DTS units as the donor were prepared; they were shown to interact efficiently with acceptor groups, such as benzothiadiazole, 10 thiazolothiazole [11][12][13] and thienopyrrolodione, 14 and their applications to high-performance BHJ-type PSCs were explored.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and optical and photovoltaic properties of dithienosilole–dithienylpyridine and dithienosilole–pyridine alternate polymers and polymer–B(C6F5)3 complexes

Tanaka

Ohshita

Ooyama

et al. 2013

Polym J

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Donor-acceptor (D-A)-type alternate polymers were synthesized, with either dithienyldithienosilole or dithienosilole as the donor and pyridine as the acceptor, and they exhibited broad absorption peaks at approximately 520 nm. Complex formation of the polymers with B(C 6 F 5 ) 3 was examined, revealing even broader absorption peaks, with the edges red-shifted relative to the parent polymers. Blend films of the polymers and their complexes with PC 71 BM were applied as active layers in bulk heterojunction-type polymer solar cells, resulting in a power-conversion efficiency (PCE) of 0.25-1.33%. Treatment of TiO 2 electrodes with the polymer solutions led to the attachment of polymer on the TiO 2 surface. Using the resulting polymer-attached TiO 2 electrodes, dye-sensitized solar cells were fabricated with a PCE of 0.54-0.55%.

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Effects of Side Chains on Thiazolothiazole‐Based Copolymer Semiconductors for High Performance Solar Cells

Cited by 190 publications

References 42 publications

Electronic Structure and Transition Energies in Polymer–Fullerene Bulk Heterojunctions

Electronic Structure and Transition Energies in Polymer–Fullerene Bulk Heterojunctions

Synthesis and Characterization of an Alkoxythiazole-thiazolothiazole Semiconducting Polymer for Organic Solar Cells

Synthesis and optical and photovoltaic properties of dithienosilole–dithienylpyridine and dithienosilole–pyridine alternate polymers and polymer–B(C6F5)3 complexes

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