A Novel Sandwich Needlelike Structure in Annealed P3HT:PCBM Blend Films

被引：0
作者：
Zeng Xue-Song [1 ]
Shi Tong-Fei [1 ]
Li Ning [1 ]
Li Xin-Hua [1 ]
Zhao Yu-Feng [1 ]
Wang Wen-Bo [1 ]
Zhou Bu-Kang [1 ]
Duan Hua-Hua [1 ]
Wang Yu-Qi [1 ]
机构：
[1] Chinese Acad Sci, Inst Solid State Phys, Key Lab Mat Phys, Hefei 230031, Peoples R China
来源：
CHINESE PHYSICS LETTERS | 2014年 / 31卷 / 06期
基金：
中国国家自然科学基金;
关键词：
SOLAR-CELL APPLICATIONS; PHOTOVOLTAIC CELL; POLY(3-HEXYLTHIOPHENE); MORPHOLOGY; SYSTEMS;
D O I：
10.1088/0256-307X/31/6/067201
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
A unique needlelike sandwich structure is observed in the P3HT:PCBM blend films after annealing at 220 degrees C. The real-time observation of a growing needle indicates that the needle exhibits 7 mu m/min 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 (similar to 220 degrees C), the aggregation of PCBM results in recrystallization of P3HT in the PCBM-depleted regions. These results will give clearer understanding of the melting, diffusion, and recrystallization behavior of the organic eutectic system.
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页数：4
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