摘要
A unique needlelike sandwich structure is observed in the P3HT：PCBM blend films after annealing at 220℃. The real-time observation of a growing needle indicates that the needle exhibits 7μm/rain longitudinal growth rate and no lateral growth. Both confocal fluorescence and Raman microscopic mapping measurements reveal that these needles have a PCBM core sandwiched between P3HT edges. According to the eutectic nature of P3HT：PCBM nature, when annealing at high temperature （-220℃）, the aggregation of PCBM results in recxTstallization of P3HT in the PCBM-depleted regions. These results will give dearer understanding of the melting, diffusion, and recrystallization behavior of the organic eutectic system.
A unique needlelike sandwich structure is observed in the P3HT：PCBM blend films after annealing at 220℃. The real-time observation of a growing needle indicates that the needle exhibits 7μm/rain longitudinal growth rate and no lateral growth. Both confocal fluorescence and Raman microscopic mapping measurements reveal that these needles have a PCBM core sandwiched between P3HT edges. According to the eutectic nature of P3HT：PCBM nature, when annealing at high temperature （-220℃）, the aggregation of PCBM results in recxTstallization of P3HT in the PCBM-depleted regions. These results will give dearer understanding of the melting, diffusion, and recrystallization behavior of the organic eutectic system.
基金
Supported by the National Natural Science Foundation of China under Grant Nos 11104271 and 11179042.
