The adsorption and reconstruction of strong electron acceptor tetracyanoethylene (TCNE) on Si(001)-(2×1): A density functional theory investigation

Cai, Y.; Wu, Xianxin; Liu, Hengjin; Fu, Wenchao; Liu, Qian

doi:10.1016/j.susc.2011.11.022

Cited by 1 publication

(1 citation statement)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Here, we continue our investigation of the bimolecular PET from DPP-Pt(II)(acac) to an electron acceptor in solution by focusing on tetracyanoethylene (TCNE) as the electron acceptor. TCNE was selected for its strong electron-accepting ability and distinctive relaxation processes, lack of spectral overlap with the donor, CT-state lifetimes in TCNE-based electron donoracceptor systems, 30,31 and its ability to form different complex geometries. 32 Here, we predict that the DPP-Pt(II)(acac)/TCNE system can form CT complexes, thereby displaying interesting photophysical properties including ultrafast PET, rapid CS, and slow CR.…”

Section: Introductionmentioning

confidence: 99%

Ultrafast Excited-State Dynamics of Diketopyrrolopyrrole (DPP)-Based Materials: Static versus Diffusion-Controlled Electron Transfer Process

et al. 2015

View full text Add to dashboard Cite

Singlet-to-triplet intersystem crossing (ISC) and photoinduced electron transfer (PET) of platinum(II)-containing diketopyrrolopyrrole (DPP) oligomers in the presence and absence of tetracyanoethylene (TCNE), a strong electron-acceptor, were investigated using femtosecond and nanosecond transient absorption spectroscopy with broadband capabilities. The effect of incorporating platinum(II) in the photophysical properties of DPP molecule was evaluated by comparing the excited-state dynamics of DPP with and without Pt metal centers. Steady-state measurements reveal that platinum(II) incorporation greatly facilitates interactions between DPP-Pt(acac) and TCNE, resulting in the formation of charge transfer (CT) complexes. In the absence of TCNE, the transient absorption spectra revealed ultrafast ISC of DPP-Pt(acac) followed by a long-lived triplet state; however, in the presence of TCNE, PET from the excited DPP-Pt(acac) and from DPP to TCNE formed radical ion pairs. We measured an ultrafast PET from DPP-Pt(acac) to TCNE (i.e., a picosecond regime) that was much faster than that from DPP to TCNE (i.e., nanosecond time scale), which is a diffusion-controlled process. Our results provide clear evidence that the PET rate is eventually controlled by the platinum(II) incorporation.

show abstract

Section: Introductionmentioning

confidence: 99%