Extended Photocurrent Spectrum of a Low Band Gap Polymer in a Bulk Heterojunction Solar Cell

Campos, Luis M.; Tontcheva, Ana; Güneş, Serap; Sönmez, Gürsel; Neugebauer, Helmut; Sariçiftçi, Niyazi Serdar; Wudl, Fred

doi:10.1021/cm050463+

Cited by 192 publications

(129 citation statements)

References 17 publications

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“…Reports on low-band gap polymers are emerging recently. [6][7][8][9][10][11] In designing low-band gap polymers for bulk heterojunctions solar cells various aspects need to be considered. For a conventional p-n junction solar cell with a single band gap ͑E g ͒, a reduction of E g results in an increased absorption of light but decreased open circuit voltage ͑V oc ͒.…”

Section: Low-band Gap Poly"di-2-thienylthienopyrazine…:fullerene Solamentioning

confidence: 99%

Low-band gap poly(di-2-thienylthienopyrazine):fullerene solar cells

Wienk

Turbiez

Struijk

et al. 2006

Applied Physics Letters

194

136

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Section: Low-band Gap Poly"di-2-thienylthienopyrazine…:fullerene Solamentioning

confidence: 99%

Low-band gap poly(di-2-thienylthienopyrazine):fullerene solar cells

Wienk

Turbiez

Struijk

et al. 2006

Applied Physics Letters

194

136

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“…Among them are donor-acceptor pairs mediated by salt bridges [13], thienopyrazine-based copolymers [14], n-type conjugated polymers based on electron-deficient tetraazabenzodifluoranthene diimide [15][16][17][18], etc. Such conjugated polymer semiconductors with electron donor-acceptor transfer have become of growing interest for organic electronic applications [19][20][21][22], such as photovoltaic cells [23][24][25], light emitting diodes (LEDs) [26][27][28][29], and field-effect transistors [30][31][32][33]. During the past decade more evidence for the electron transport in DNA [34][35][36][37][38] (see review [39]) has also been reported.…”

Section: Introductionmentioning

confidence: 99%

Donor-acceptor electron transport mediated by solitons

2014

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Readers may view, browse, and/or download material for temporary copying purposes only, provided these uses are for noncommercial personal purposes. Except as provided by law, this material may not be further reproduced, distributed, transmitted, modied, adapted, performed, displayed, published, or sold in whole or part, without prior written permission from the American Physical Society.Additional information: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. We study the long-range electron and energy transfer mediated by solitons in a quasi-one-dimensional molecular chain (conjugated polymer, alpha-helical macromolecule, etc.) weakly bound to a donor and an acceptor. We show that for certain sets of parameter values in such systems an electron, initially located at the donor molecule, can tunnel to the molecular chain, where it becomes self-trapped in a soliton state, and propagates to the opposite end of the chain practically without energy dissipation. Upon reaching the end, the electron can either bounce back and move in the opposite direction or, for suitable parameter values of the system, tunnel to the acceptor. We estimate the energy efficiency of the donor-acceptor electron transport depending on the parameter values. Our calculations show that the soliton mechanism works for the parameter values of polypeptide macromolecules and conjugated polymers. We also investigate the donor-acceptor electron transport in thermalized molecular chains.

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“…[3][4][5][6][7][8] To the best of our knowledge, the most successful strategy to obtain the NBG conjugated polymers is the introduction of donor-acceptor (D-A) alternating repeating units into the backbone of the polymer, which can effectively broaden the absorption and tune energy levels through the intramolecular charge transfer (ICT) from electron-rich unit to electron- 19 naphthadithiophene (NDT) 20 and so on have been investigated. Yet, there are only limited number of electron-withdrawing moieties, such as substituted thieno [3,4-b]thiophene 18,21 with electron-withdrawing group, thieno [3,4-b]pyrazine (TPz), 22 di-ketopyrrolo-[3,4-c]pyrrole-4,6-dione (DPP), 23 N-alkylthieno [3,4-c]pyrrole-4,6-dione (TPD), 24 isoindigo (ID), 25 2,1,3-benzothiadiazole (BT) 26 have been reported. Amongst them, owing to stronger electron-withdrawing ability, relatively high oxidation potential and good stability in air, the BT and its derivative were investigated widely and exhibited promising performance, which were regarded as one of the effective building blocks to date for tuning the energy levels and broadening the absorption spectrum of the resulting copolymer.…”

Section: Introductionmentioning

confidence: 99%