| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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A Novel Sandwich Needlelike Structure in Annealed P3HT:PCBM Blend Films |
| ZENG Xue-Song, SHI Tong-Fei**, LI Ning, LI Xin-Hua, ZHAO Yu-Feng, WANG Wen-Bo, ZHOU Bu-Kang, DUAN Hua-Hua, WANG Yu-Qi |
Key Laboratory of Material Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031
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| Cite this article: |
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ZENG Xue-Song, SHI Tong-Fei, LI Ning et al 2014 Chin. Phys. Lett. 31 067201 |
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Abstract A unique needlelike sandwich structure is observed in the P3HT:PCBM blend films after annealing at 220°C. The real-time observation of a growing needle indicates that the needle exhibits 7 μm/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 (～220°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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Published: 26 May 2014
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| PACS: |
72.80.Le
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(Polymers; organic compounds (including organic semiconductors))
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64.75.Va
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(Phase separation and segregation in polymer blends/polymeric solutions)
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Abstract
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