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Molecular ordering and phase segregation induced by a volatile solid additive for highly efficient all-small-molecule organic solar cells

Chen, Shanshan ; Ye, Junfeng ; Yang, Qianguang ; Oh, Jiyeon ; Hu, Dingqin ; Yang, Ke ; Odunmbaku, George Omololu ; Li, Feng ; Yu, Qingqing ; Kan, Zhipeng ; Xiao, Zeyun ; Yang, Changduk ; Lu, Shirong ; Sun, Kuan

Journal of materials chemistry. A, Materials for energy and sustainability, 2021-02, Vol.9 (5), p.2857-2863 [Periódico revisado por pares]

Cambridge: Royal Society of Chemistry

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  • Título:
    Molecular ordering and phase segregation induced by a volatile solid additive for highly efficient all-small-molecule organic solar cells
  • Autor: Chen, Shanshan ; Ye, Junfeng ; Yang, Qianguang ; Oh, Jiyeon ; Hu, Dingqin ; Yang, Ke ; Odunmbaku, George Omololu ; Li, Feng ; Yu, Qingqing ; Kan, Zhipeng ; Xiao, Zeyun ; Yang, Changduk ; Lu, Shirong ; Sun, Kuan
  • Assuntos: Charge transport ; Cytology ; Energy conversion efficiency ; Fullerenes ; Heterojunctions ; Morphology ; Optimization ; Organic chemistry ; Phase separation ; Photovoltaic cells ; Self-assembly ; Solar cells
  • É parte de: Journal of materials chemistry. A, Materials for energy and sustainability, 2021-02, Vol.9 (5), p.2857-2863
  • Notas: 10.1039/d0ta10649f
    Electronic supplementary information (ESI) available. See DOI
  • Descrição: Morphology control remains a major challenge for all-small-molecule organic solar cells (ASM OSCs), mainly reflecting in the elusive trade-off between the molecular ordering and phase separation of the active layer. In this study, a novel volatile solid additive IC-FI, namely dihalogenated 1,1-dicyanomethylene-3-indanone, whose chemical structure is analogous to the end-group moiety of the representative non-fullerene acceptor, has been prepared and applied in BTR-Cl:N3-based ASM OSCs. The intrinsic structural feature of IC-IF enables the self-assembly of N3 along with the enhanced intermixing between BTR-Cl and N3 in the subsequent thermal annealing process. This offers nano-scale phase separation with a predominant face-on oriented molecular packing in the blend film, thereby boosting the effective charge transport and extraction process in the device. Consequently, a superior power conversion efficiency (PCE) of 14.43% with an outstanding fill factor (FF) of 73.53% was achieved in the IC-FI processed device. These results indicate that the use of the volatile solid additive is a simple and practical strategy for the optimization of the small-molecule bulk-heterojunction morphology toward highly efficient ASM OSCs. The IC-IF volatile solid additive enables an interpenetrating BHJ microstructure with a predominant π-face-on molecular packing, affording an efficient all-small-molecule OSCs with an efficiency of 14.43% and an outstanding fill factor of 73.53%.
  • Editor: Cambridge: Royal Society of Chemistry
  • Idioma: Inglês
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