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For BBTI-2, the DIO additive clearly prevents the coarse phase separation (hence the improved device efficiency of 6.0%), although the blend morphology judged from AFM still looks quite different from the higher performing BBTI-1 devices.
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39, 40 Compared to BBTI-1, the photoactive blend with BBTI-2 (no additive) has a much coarser phase separation, which could explain the poor device performance (PCE of 3.3%).
For BBTI-2, the height histograms clearly emphasize the coarse and unfavorable phase separation for the blend without solvent additive, while DIO reduces the domain size noticeably to a length scale comparable to the excitons diffusion length.
To achieve the temporal and spatial scales required for phase separation we use coarse-grained molecular dynamics where beads represent bi-functional epoxy, a di-amine crosslinker and monomers in the thermoplastic.
It was found that these templates helped in imposing some fine pore structures (< 200 nm) characteristic of them but the coarser pores (> 1 μm) that are formed due to phase separation and aggregation effects upon cross-linking could not be avoided.
We develop a coarse-grained model to investigate the influence of nanoscale particles on the phase separation and the morphology of symmetric AB diblock copolymer melts.
For BBTI-2, SEM confirms the coarse and detrimental blend morphology, while it is also clear that introduction of DIO significantly improves the phase separation.
Phase separation is observed for intermediate stoichiometries.
Figure 2 Phase separation in multiple emulsions.
(2) Phase separation by thermal annealing.
The mechanism of phase separation was discussed.
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