Institute of Polymer Science and Engineering, National Taiwan University, Taipei, Taiwan.
Langmuir. 2011 Jan 4;27(1):109-15. doi: 10.1021/la103972j. Epub 2010 Dec 8.
An ordered nanostructure can be created from the hybrid materials of self-assembly poly(3-hexyl thiophene-b-2-vinyl pyridine) and nicotinic acid-modified titanium dioxide nanoparticles (P3HT-b-P2VP/TiO(2)). TEM and XRD analyses reveal that the TiO(2) nanoparticles (NPs) are preferentially confined in the P2VP domain of P3HT-b-P2VP whereas TiO(2) NPs interact with either pure P3HT or a blend of P3HT and P2VP to produce microsized phase segregation. The morphologies of lamellar and cylindrical structures are disturbed when the loading of TiO(2) NPs is 40 wt % or higher. Cylindrical P3HT-b-P2VP/TiO(2) exhibits a small blue shift in absorption and photoluminescence spectra with increasing TiO(2) loading as compared to P3HT/TiO(2). The NPs cause a slightly misaligned P3HT domain in the copolymer. Furthermore, the PL quenching of P3HT-b-P2VP/TiO(2) becomes very large as a result of efficient charge separation in the ordered nanodomain at 16 nm. Solar cells fabricated from self-assembly P3HT-b-P2VP/TiO(2) hybrid materials exhibit a >30 fold improvement in power conversion efficiency as compared to the corresponding 0.3P3HT-0.7P2VP/TiO(2) polymer blend hybrid. This study paves the way for the further development of high-efficiency polymer-inorganic nanoparticle hybrid solar cells using a self-assembled block copolymer.
有序纳米结构可以由自组装聚（3-己基噻吩-b-2-乙烯基吡啶）和烟酸酸修饰的二氧化钛纳米粒子（P3HT-b-P2VP/TiO(2)）的杂化材料形成。TEM 和 XRD 分析表明，TiO(2)纳米粒子（NPs）优先被限制在 P3HT-b-P2VP 的 P2VP 域中，而 TiO(2) NPs 与纯 P3HT 或 P3HT 和 P2VP 的混合物相互作用，产生微相分离。当 TiO(2) NPs 的负载量为 40wt%或更高时，层状和圆柱状结构的形态会受到干扰。与 P3HT/TiO(2)相比，当负载量增加时，圆柱形 P3HT-b-P2VP/TiO(2)在吸收和光致发光光谱中出现较小的蓝移。NPs 导致共聚物中 P3HT 域略微错位。此外，由于在有序纳米域中有效分离电荷，P3HT-b-P2VP/TiO(2)的 PL 猝灭变得非常大。与相应的 0.3P3HT-0.7P2VP/TiO(2)聚合物共混杂化相比，自组装 P3HT-b-P2VP/TiO(2)杂化材料制成的太阳能电池的功率转换效率提高了 30 倍以上。这项研究为使用自组装嵌段共聚物进一步开发高效聚合物-无机纳米粒子杂化太阳能电池铺平了道路。
