Home
Resources
Publications
The Effect of Thermal Annealing on the Charge Transfer Dynamics of a Donor-Acceptor Copolymer and Fullerene: F8T2 and F8T2:PCBM

The Effect of Thermal Annealing on the Charge Transfer Dynamics of a Donor-Acceptor Copolymer and Fullerene: F8T2 and F8T2:PCBM

Yunier Garcia-Basabe, Natasha A D Yamamoto, Lucimara S Roman, Maria Luiza M Rocco

Phys Chem Chem Phys. 2015 May 7;17(17):11244-51.

PMID: 25836380

Abstract:

Ultrafast charge delocalization dynamics in an internal donor-acceptor copolymer poly(9,9-dioctylfluorenyl-co-bithiophene) (F8T2) and its blend with the fullerene derivative [6,6]-phenyl C61 butyric acid methyl ester (PCBM) was studied by resonant Auger spectroscopy measured around sulfur K-edge using the core-hole clock approach. The effect of thermal annealing on the charge transfer delocalization times (τCT) was also investigated. Two main transitions with S 1s → π* and S 1s → σ*(S-C) character were measured at the S 1s NEXAFS spectra. Poor charge delocalization was observed for as cast polymeric films at photon energies corresponding to the S 1s → π* transition, which may suggest a weak π-electronic coupling due to weak polymer crystallinity and chain stacking. Enhancement in the charge transfer process for photon energies close to the resonance maximum was observed for thermally annealed F8T2 and its blends. Atomic Force Microscopy (AFM) topography for as cast F8T2:PCBM shows a top position of PCBM units relative to the polymer, homogeneously distributed on the film surface. This configuration improves the charge delocalization through S 1s → π* molecular orbitals for the as cast blended film, suggesting a strong π-electronic coupling. A new rearrangement of F8T2:PCBM film was found after thermal annealing, leading to a more efficient electron transfer channel through σ* molecular orbitals.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP210347561	F8T2		210347-56-1	Price

As a specialist in analytical chemical Products, Alfa Chemistry offers consumers a wealth of raw materials and a full range of technologies and services.

QUICK LINKS

HEADQUARTERS

Tel:

Fax:

Email: