Polymer(Korea), Vol.41, No.1, 134-138, January, 2017
비용매 첨가량과 숙성시간이 폴리사이오펜 박막의 결정생성과 성장에 미치는 영향
Effect of Non-solvent Addition Amount and Aging Time on the Crystal Nucleation and Growth in Polythiophene Thin Film
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초록
본 연구에서는 poly(3-hexylthiophene)(P3HT)을 양용매인 클로로포름에 용해시킨 다음, 용액 내에서 분자 규칙도를 향상시키기 위해서 비용매인 acetonitrile을 소량 첨가하였다. Acetonitrile의 첨가량을 조절하여 용액 내에 초기에 형성되는 P3HT 결정 생성량을 조절하였으며 숙성시간을 통해 결정을 성장시켰다. Acetonitrile 6 vol%를 첨가했을 경우, 초기에 결정 생성량이 적어 낮은 결정성의 박막이 제조되었으나, 숙성시간이 증가함에 따라 높은 결정화도를 가진 박막이 제조되었다. 결과적으로 비용매의 첨가량에 따라서 분자들의 결정생성 개수와 결정성장의 최적시간이 달라지기 때문에, 비용매 첨가량에 따라 적절한 숙성 시간을 선정하면 고분자 박막의 결정화도와 전기적 성능을 획기적으로 향상시킬 수 있다.
In this work, we added small amounts of the non-solvent (acetonitrile) to the chloroform solutions prior to film formation in order to enhance molecular order of poly(3-hexylthiophene) (P3HT). In the early stage, nucleation sites were controlled by adding volume ratio of acetonitrile, and nucleated crystals of P3HT molecule were grown by aging the ordered precursor solution. In the case of the addition of acetonitrile, 6 vol%, the P3HT thin film showed very low crystallinity in the early stage due to low density nucleation sites. After aging the precursor solution, however, highly ordered P3HT thin film was fabricated. The molecular order and electrical properties of P3HT films were profoundly enhanced by controlling both volume ratio of added non-solvent and aging time, because nucleation sites and optimum aging time of crystal growth were dependent on the amount of non-solvent.
Keywords:organic thin film transistor;poly(3-hexylthiophene);non solvent;molecular ordering;aging time
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