Syntheses and Electronic Properties of New Type of Donor–Acceptor Type Copolymers for Solar Cell Applications

Özel, Mertcan; Osken, Ipek; Öztürk, Turan

doi:10.1080/10426507.2015.1052431

Cited by 3 publications

(1 citation statement)

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“…The additional electron-rich thiophene unit leads to overall stronger electron donating segments in PFDTENT compared to PFDENT, and as a result of stronger ICT along the polymer chains resulting in reduced band gaps. A recent study by Ozel et al has shown that the incorporation of phenylene–acetylene units as spacers in D–A polymers does not add any extension of π-conjugation over polymer chains, suggesting that the electron-donating properties of thiophene are key in leading to the reduction in the band gaps of PFDTENT compared to PFDENT [ 42 ].…”

Section: Resultsmentioning

confidence: 99%

Synthesis and Characterization of Polymers Containing Ethynylene and Ethynylene-Thiophene Based Alternating Polymers Containing 2,1,3-Linked Naphthothiadiazole Units as Acceptor Linked with Fluorine as Donor: Electrochemical and Spectroscopic Studies

et al. 2022

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The effect of ethynylene or ethynylene–thiophene spacers on the band gap of alternating polymers, containing 4,9-naphthothiadiazole units as an acceptor and 2,7-linked fluorene repeat units as a donor, were investigated. The Sonogashira coupling reaction was employed to prepare the two novel copolymers, namely ((9,9-dioctyl-fluorene)-2,7-diethynylene-alt-4,9-2,1,3-naphthothiadiazole (PFDENT) and poly(5,5’-(9,9-dioctyl-fluorene-2,7-diyl)bis(ethynyl-2-thienyl)-alt-4,9-(2,1,3-naphthothiadiazole) (PFDTENT). The optical, electrochemical and thermal properties of the two obtained polymers were widely investigated and compared. Both resulting polymers showed low solubility in common organic solvents and moderate molecular weights. It is believed that the introduction of acetylene linkers rather than acetylene–thiophene spacers on the polymer chains reduces the steric hindrance between the donor and acceptor units which leads to the adoption of more planar structures of polymeric chains, resulting in decreased molecular weights of the resulting conjugated polymers. Thus, both ethynylene-based polymers and ethynylene–thiophene-based polymers showed red-shifted absorption maxima compared to their counterpart (thiophene-based polymer), owing to the adoption of more planar structures. Optical studies revealed that the new ethynylene and ethynylene–thiophene-based polymers displayed low band gaps compared to their thiophene analogue polymer PFDTNT. Both resulting polymers showed good thermal stability. X-ray diffraction (XRD) patterns of both polymers revealed that PFDENT and PFDTENT possessed an amorphous nature in solid state.

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Section: Resultsmentioning

confidence: 99%