The Side-Chain Effects on Photovoltaic Properties of Copolymers Based on Phenothiazine and Thiophene

Yoo, Han Sol; Yun, Dae Hee; Ko, Tae Won; Park, Yong Sung; Woo, Je Wan

doi:10.4028/www.scientific.net/amr.634-638.2621

Cited by 2 publications

(2 citation statements)

References 18 publications

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“…[42,45] Even in those cases, however, the FF was still low, and similar transport problems were visible from the J-V curves. Another strategy was to reduce the thickness of the BHJ layer, [43] but again the improvement was limited by the poor transport properties of the polymers. In the few instances where the mobility was measured, [41,46] similar results were obtained for the hole mobilities as we presented, but no mention of the electron mobilities was found.…”

Section: Performance Of the Polymers In Bulk Heterojunction Solar Cellsmentioning

confidence: 99%

“…[28,[32][33][34][35][36][37][38][39][40] Phenothiazine can be reversibly oxidized at a redox potential of ≈3.6 V versus Li/Li + , and this property is maintained even when phenothiazine is incorporated into a conjugated copolymer architecture with bithiophene or fluorene as comonomer. [28] Concerning multifunctionality, phenothiazine has also been incorporated as donor in donor-acceptor systems (polymers [41][42][43][44][45][46] or small molecules [47,48] ) for BHJ solar cells.…”

Section: Introductionmentioning

confidence: 99%

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Phenothiazine‐Based Donor–Acceptor Polymers as Multifunctional Materials for Charge Storage and Solar Energy Conversion

Wessling

Andrés

Morhenn

et al. 2022

Macromol. Rapid Commun.

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The increasing energy demand for diverse applications requires new types of devices and materials. Multifunctional materials that can fulfill different roles are of high interest as they can allow fabricating devices that can both convert and store energy. Herein, organic donor–acceptor redox polymers that can function as charge storage materials in batteries and as donor materials in bulk heterojunction (BHJ) photovoltaic devices are investigated. Based on its reversible redox chemistry, phenothiazine is used as the main building block in the conjugated copolymer design and combined with diketopyrrolopyrrol and benzothiadiazole as electron‐poor comonomers to shift the optical absorption into the visible region. The resulting polymers show excellent cycling stability as positive electrode materials in lithium–organic batteries at discharge potentials of 3.6–3.7 V versus Li/Li+ as well as good performances in BHJ solar cells with up to 1.9% power conversion efficiency. This study shows that the design of such multifunctional materials is possible, however, that it also faces challenges, as essential properties for good device function can lead to diametrically opposite requirements in materials design.

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Section: Performance Of the Polymers In Bulk Heterojunction Solar Cellsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Phenothiazine‐Based Donor–Acceptor Polymers as Multifunctional Materials for Charge Storage and Solar Energy Conversion

Wessling

Andrés

Morhenn

et al. 2022

Macromol. Rapid Commun.

View full text Add to dashboard Cite

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π‐Conjugation Enables Ultra‐High Rate Capabilities and Cycling Stabilities in Phenothiazine Copolymers as Cathode‐Active Battery Materials

Acker

Rzesny

Marchiori

et al. 2019

Adv Funct Materials

112

102

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In recent years, organic battery cathode materials have emerged as an attractive alternative to metal oxide–based cathodes. Organic redox polymers that can be reversibly oxidized are particularly promising. A drawback, however, often is their limited cycling stability and rate performance in a high voltage range of more than 3.4 V versus Li/Li+. Herein, a conjugated copolymer design with phenothiazine as a redox‐active group and a bithiophene co‐monomer is presented, enabling ultra‐high rate capability and cycling stability. After 30 000 cycles at a 100C rate, >97% of the initial capacity is retained. The composite electrodes feature defined discharge potentials at 3.6 V versus Li/Li+ due to the presence of separated phenothiazine redox centers. The semiconducting nature of the polymer allows for fast charge transport in the composite electrode at a high mass loading of 60 wt%. A comparison with three structurally related polymers demonstrates that changing the size, amount, or nature of the side groups leads to a reduced cell performance. This conjugated copolymer design can be used in the development of advanced redox polymers for batteries.

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The Side-Chain Effects on Photovoltaic Properties of Copolymers Based on Phenothiazine and Thiophene

Cited by 2 publications

References 18 publications

Phenothiazine‐Based Donor–Acceptor Polymers as Multifunctional Materials for Charge Storage and Solar Energy Conversion

Phenothiazine‐Based Donor–Acceptor Polymers as Multifunctional Materials for Charge Storage and Solar Energy Conversion

π‐Conjugation Enables Ultra‐High Rate Capabilities and Cycling Stabilities in Phenothiazine Copolymers as Cathode‐Active Battery Materials

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