![lecroy wavesurfer 42xs lecroy wavesurfer 42xs](https://i.ytimg.com/vi/VafwkN_NV3M/maxresdefault.jpg)
Photoexcitation of the ordered films results in initial formation of a spin-correlated radical ion pair (electron–hole pair) as indicated by magnetic field effects on the formation of free charge carriers which live for ∼4 μs. In contrast, upon CH 2Cl 2 vapor annealing films of 1, grazing-incidence X-ray scattering shows that the molecules form a more ordered structure. The absence of long-lived, charge separation in the disordered film suggests that few free charge carriers are generated. Photoexcitation of 1 in toluene results in quantitative charge separation in τ = 3.1 ± 0.2 ps, with charge recombination in τ = 340 ± 10 ps, while in unannealed/disordered films of 1, charge separation occurs in τ < 250 fs, while charge recombination displays a multiexponential decay in ∼6 ns. The photophysics of a covalently linked perylenediimide–diketopyrrolopyrrole–perylenediimide acceptor–donor–acceptor molecule (PDI–DPP–PDI, 1) were investigated and found to be markedly different in solution versus in unannealed and solvent annealed films. This result has significant implications for the design of organic solar cells based on covalent donor-acceptor systems and shows that long-lived, charge-separated states can be achieved by controlling intramolecular charge separation dynamics in well-ordered systems. Photoexcitation of the ordered films results in initial formation of a spin-correlated radical ion pair (electron-hole pair) as indicated by magnetic field effects on the formation of free charge carriers which live for ∼4 μs.
![lecroy wavesurfer 42xs lecroy wavesurfer 42xs](https://res.cloudinary.com/iwh/image/upload/q_auto,g_center/w_1024,h_768,c_lpad/assets/1/26/Lecroy_WaveSurfer_3022.jpg)
![lecroy wavesurfer 42xs lecroy wavesurfer 42xs](https://res.cloudinary.com/iwh/image/upload/q_auto,g_center,w_600/assets/1/7/lecroy_wavesurfer_4000_img5.jpg)
Photoexcitation of 1 in toluene results in quantitative charge separation in τ = 3.1 ± 0.2 ps, with charge recombination in τ = 340 ± 10 ps, while in unannealed/disordered films of 1, charge separation occurs in τ 2Cl2 vapor annealing films of 1, grazing-incidence X-ray scattering shows that the molecules form a more ordered structure. The photophysics of a covalently linked perylenediimide-diketopyrrolopyrrole-perylenediimide acceptor-donor-acceptor molecule (PDI-DPP-PDI, 1) were investigated and found to be markedly different in solution versus in unannealed and solvent annealed films.