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Article Dans Une Revue Journal of Materials Chemistry C Année : 2015

A bridged low band gap A-D-A quaterthiophene as efficient donor for organic solar cells

Francois Baert
  • Fonction : Auteur
Clement Cabanetos
Antoine Leliege
  • Fonction : Auteur
Eva Kirchner
  • Fonction : Auteur
Olivier Segut
Olivier Aleveque
Magali Allain
Jean Roncali
Philippe Leriche
Philippe Blanchard

Résumé

[small alpha],[small omega]-Bis(dicyanovinyl)quaterthiophene 1 with a median 4,4-diethyl-4H-cyclopenta[2,1-b:3,4-b[prime or minute]]dithiophene has been synthesized. UV-Vis absorption data show that the covalent bridging of the inner 2,2[prime or minute]-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 [small pi]-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 [small alpha],[small omega]-bis(dicyanovinyl)quaterthiophene 2.

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Matériaux
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Dates et versions

hal-01156570 , version 1 (17-11-2015)

Identifiants

Citer

Francois Baert, Clement Cabanetos, Antoine Leliege, Eva Kirchner, Olivier Segut, et al.. A bridged low band gap A-D-A quaterthiophene as efficient donor for organic solar cells. Journal of Materials Chemistry C, 2015, 3, pp.390-398. ⟨10.1039/c4tc02212b⟩. ⟨hal-01156570⟩
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