Controlled Synthesis of Fullerene-Attached Poly(3-alkylthiophene)-Based Copolymers for Rational Morphological Design in Polymer Photovoltaic Devices
Controlled Synthesis of Fullerene-Attached Poly(3-alkylthiophene)-Based Copolymers for Rational Morphological Design in Polymer Photovoltaic Devices
复制标题
DOI：
10.1021/ma300376m
复制
发表时间：
2012-08-28
期刊：
影响因子：
5.5
通讯作者：
Tajima, Keisuke
中科院分区：
文献类型：
--
作者：
Miyanishi, Shoji;Zhang, Yue;Tajima, Keisuke
通过Grignard复分解法、Ni催化的准活性聚合和随后的叠氮化物-炔点击反应合成了嵌段长度可控的基于聚（3-烷基噻吩）的二嵌段共聚物，并在其中一个嵌段的侧链中引入富勒烯官能团.接枝共聚物具有良好的溶解性（>30 g L-1氯苯）和较高的分子量（M-n > 20000）。两嵌段共聚物膜形成了清晰的纳米结构，尺寸约为100 nm。20 nm，由聚（3-己基噻吩）块的结晶和富勒烯基团的聚集驱动，如在AFM相位图像中观察到的。基于共聚物的光伏器件显示出2.5%的功率转换效率，与先前报道的单组分器件相比具有高得多的填充因子0.63。这些结果表明，合理的材料设计，使光伏应用的合适的供体-受体纳米结构的建设，而不依赖于材料的混合。
Poly(3-alkylthiophene)-based diblock copolymers with controllable block lengths were synthesized by combining the Grignard metathesis method, Ni-catalyzed quasi-living polymerization, and a subsequent azide-alkyne click reaction to introduce a fullerene functionality into the side chains of one of the blocks. The fiillerene-attached copolymers had good solubility (>30 g L-1 chlorobenzene) with high molecular weights (M-n > 20 000). The diblock copolymer films formed clear nanostructures with sizes of ca. 20 nm, driven by crystallization of the poly(3-hexylthiophene) block and aggregation of the fullerene groups, as observed in AFM phase images. The copolymer-based photovoltaic device showed a power conversion efficiency of 2.5%, with a much higher fill factor of 0.63 in comparison to the previously reported single component devices. These results indicate that rational material designs enable the construction of suitable donor-acceptor nanostructures for photovoltaic applications, without relying on the mixing of materials.