Crystallization Behavior and Morphology of Poly(3-hexylthiophene) and [6,6]-Phenyl-C61-Butyric Acid Methyl Ester Blend from Isothermal Crystallization Process

• Main Authors: Pan Chien-Wen, 潘建文
• Other Authors: Huang Ping-Tsung
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/36731385434849850617

碩士 === 輔仁大學 === 化學系 === 99 === Abstract Performance of polymer solar cells has been improved significantly since the introduction of bulk heterojunction concept in 1994. It greatly increases the interfacial area between the p-type material and the n-type material. To further improve performance of polymer solar cells, thermal treatment of the active layer becomes very crucial, it induces crystallization of the p-type material and results in higher carrier mobility. However, phase separation can not be controlled easily during the treatment process and lead to a poor reproducibility of film morphology. In this study, an isothermal crystallization process is applied to the P3HT/PCBM film to minimize the post-treatment of P3HT/PCBM film. Morphology and properties of the isothermally crystallized P3HT/PCBM film is different from that prepared from spin-coating process. DSC is used to investigate crystallization behavior of P3HT/PCBM film. UV-Vis and X-ray spectroscopies are used to observe aggregation behavior and crystallinity of P3HT/PCBM film. AFM and SEM are conducted to follow up the morphological change in P3HT/PCMB film. We find existence of highly crystallized micro crystalline domains in the isothermally crystallized P3HT/PCBM film and the surface of the P3HT/PCBM film is very smooth as comparing to that in spin-coated P3HT/PCBM film.