skip to main content
Idioma:

Evolution of the Excited‐State Dynamics of 2H‐Dinaphthopentacene Based Dyes in Dye‐Sensitized Solar Cells: From Chromophoric Core to Ultimate Dye

Liu, Jiao ; Ren, Yameng ; Zhang, Min ; Dong, Xiandui

Solar RRL, 2018-09, Vol.2 (9), p.n/a [Periódico revisado por pares]

Texto completo disponível

Citações Citado por
  • Título:
    Evolution of the Excited‐State Dynamics of 2H‐Dinaphthopentacene Based Dyes in Dye‐Sensitized Solar Cells: From Chromophoric Core to Ultimate Dye
  • Autor: Liu, Jiao ; Ren, Yameng ; Zhang, Min ; Dong, Xiandui
  • Assuntos: charge transfer ; excited‐state dynamics ; organic dyes ; solar cells
  • É parte de: Solar RRL, 2018-09, Vol.2 (9), p.n/a
  • Descrição: The excited‐state evolution property of organic sensitizers plays a vital role in the interfacial exciton dissociation yield and ultimate power output of an organic dye‐sensitized solar cell. In this paper, we select two 2H‐dinaphthopentacene‐based organic donor–acceptor dyes as well as their composition segments and scrutinize the evolution of the excited‐state dynamics of organic materials from the 2H‐dinaphthopentacene core to its derivatives by sequentially tethering an auxiliary donor diarylamine, and an electron acceptor, 4‐(7‐ethynylbenzo[c][1,2,5]thiadiazol‐4‐yl)benzoic acid. Time‐resolved spectroscopy measurements and density functional theory calculations show that the degree of intramolecular photoinduced charge transfer plays a crucial role in determining the lifetime of the equilibrium excited‐state. Moreover, both the 2H‐dinaphthopentacene chromophore core and its derivatives have an obvious dynamic Stokes shift in toluene, which is also observed for ultimate dyes grafted on oxide films, indicating the occurrence of a large energy relaxation from the optically generated hot excited‐state to the equilibrium excited‐state. This large energy loss leads to a broad time scale for electron injection, which should be carefully manipulated for future dye and device development. The excited‐state dynamics evolution of 2H‐dinaphthopentacene‐based organic materials from chromophoric core to ultimate dye is scrutinized based upon femtosecond fluorescence up‐conversion and time‐correlated single photon counting measurements. Photoluminescence quantum yield measurements and density functional theory calculations are performed to understand the origin of the energy‐gap independent lifetime of equilibrium excited‐state.
  • Idioma: Inglês
Voltar para lista de resultados

  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

Buscando em bases de dados remotas. Favor aguardar.