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Dewetting behavior of polystyrene film filled with (C6H5C2H4NH3)2PbI4
Longjian Xue1, Ziyong Cheng, Jun Fu
1State Key Lab of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Graduate School of the Chinese Academy of Sciences, 5625 Renmin Street, Changchun 130022, People's Republic of China.
Abstract:
The dewetting behavior of thin (about 30 nm) polystyrene (PS) films filled with different amount of (C(6)H(5)C(2)H(4)NH(3))(2)PbI(4) (PhE-PbI(4)) on the silicon substrate with a native oxide layer was investigated. For different additive concentrations, PhE-PbI(4) showed different spatial distributions in the PS films, which had a strong influence on the film wettability, dewetting dynamics, and mechanism. With 0.5 wt % additive, PhE-PbI(4) formed a noncontinuous diffusion layer, which caused a continuous hole nucleation in the film. With about 1 wt % additive, a continuous gradient distribution layer of PhE-PbI(4) formed in the film, which inhibited the dewetting. When the concentration is higher (2 wt %), large PhE-PbI(4) aggregates, in addition to the PhE-PbI(4) continuous layer, formed in the film. These large aggregates (larger than radius of gyration of PS) migrated to the interface, resulting in the hole nucleation and eventually the complete dewetting of the film.
