19690-69-8Relevant articles and documents
Photocatalytic polymers of intrinsic microporosity for hydrogen production from water
Bai, Yang,Wilbraham, Liam,Gao, Hui,Clowes, Rob,Yang, Haofan,Zwijnenburg, Martijn A.,Cooper, Andrew I.,Sprick, Reiner Sebastian
supporting information, p. 19958 - 19964 (2021/09/20)
The most common strategy for introducing porosity into organic polymer photocatalysts has been the synthesis of cross-linked conjugated networks or frameworks. Here, we study the photocatalytic performance of a series of linear conjugated polymers of intrinsic microporosity (PIMs) as photocatalysts for hydrogen production from water in the presence of a hole scavenger. The best performing materials are porous and wettable, which allows for the penetration of water into the material. One of these polymers of intrinsic microporosity, P38, showed the highest sacrificial hydrogen evolution rate of 5226 μmol h?1g?1under visible irradiation (λ> 420 nm), with an external quantum efficiency of 18.1% at 420 nm, placing it among the highest performing polymer photocatalysts reported to date for this reaction.
Fluorobenzotriazole-Based Medium-Bandgap Conjugated D–A Copolymers for Applications to Fullerene-Based and Nonfullerene Polymer Solar Cells
Weng, Chao,Wang, Wengong,Liang, Jingtang,Wang, Guo,Tan, Songting,Shen, Ping
, p. 2330 - 2343 (2018/09/27)
Two new medium-bandgap (MBG) donor–acceptor (D–A) conjugated polymers (PSTF and PDTS) with fluorobenzotriazole as an A unit and spiro[cyclopenta[1,2-b:5,4-b′]dithiophene-4,9′-fluorene] (STF) or dithienosilole (DTS) as the D unit are designed and synthesized as donor materials for polymer solar cell (PSC) applications. PSTF shows a broader absorption spectrum relative to PDTS reflecting an additional high-energy absorption band due to the conjugated thiophene side chains on STF moiety. Compared with PDTS, PSTF exhibits weaker π–π aggregation and lower lying HOMO level. Photovoltaic properties of the PSCs reveal that either PSTF or PDTS using PC61BM as acceptor exhibits better performances than that of ITIC as acceptor, which results from the simultaneously increased Voc, Jsc, and FF of PC61BM-based PSCs. Moreover, when combined with PC61BM and ITIC, the PSTF-based PSCs exhibit an efficiency of 3.66% and 2.42%, respectively, which is 45% and almost 1.5 times higher than that of the PDTS-based PSCs, respectively. This can be ascribed to the obviously improved Voc and FF of PSTF-based PSCs benefitted from the deeper HOMO level and better active layer morphology. Our work demonstrates that using spiro-annulated building block as donor unit to construct MBG D-A copolymers is an alternative and effective approach for achieving efficient donor materials in PSCs.
A bridged low band gap A-D-A quaterthiophene as efficient donor for organic solar cells
Baert, Francois,Cabanetos, Clment,Lelige, Antoine,Kirchner, Eva,Segut, Olivier,Alvque, Olivier,Allain, Magali,Seo, Gijun,Jung, Sungyeop,Tondelier, Denis,Geffroy, Bernard,Roncali, Jean,Leriche, Philippe,Blanchard, Philippe
supporting information, p. 390 - 398 (2015/02/02)
α,ω-Bis(dicyanovinyl)quaterthiophene 1 with a median 4,4-diethyl-4H-cyclopenta[2,1-b:3,4-b′]dithiophene has been synthesized. UV-Vis absorption data show that the covalent bridging of the inner 2,2′-bithiophene leads to a significant reduction of the HOMO-LUMO gap essentially due to an increase of the HOMO level as confirmed by electrochemical and theoretical results. X-ray diffraction analysis of a single crystal of 1 shows that except for the out-of-plane ethyl groups, the conjugated system displays a quasi-planar geometry while the molecular packing exhibits strong π-stacking interactions and multiple short intermolecular contacts. Quaterthiophene 1 has been used as active donor material in organic solar cells of various architectures including bi-layer planar hetero-junctions and hybrid co-evaporated bulk hetero-junctions with C60 as electron acceptor material. A maximum conversion efficiency of 4.30% is obtained with a hybrid co-evaporated device. These results are discussed in terms of structure-properties relationships with reference to the open-chain parent α,ω-bis(dicyanovinyl)quaterthiophene 2.
