Poly(3-butylthiophene) Inducing Crystallization of Small Molecule Donor for Enhanced Photovoltaic Performance
Poly(3-butylthiophene) Inducing Crystallization of Small Molecule Donor for Enhanced Photovoltaic Performance
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DOI：
10.1021/acs.jpcc.5b04850
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发表时间：
2015-09
影响因子：
3.7
通讯作者：
Lin Zhang;Mei-Jun Pu;Weihua Zhou;Xiaotian Hu;Yong Zhang;Yuanpeng Xie;Bao Liu;Yiwang Chen
中科院分区：
文献类型：
--
作者：
Lin Zhang;Mei-Jun Pu;Weihua Zhou;Xiaotian Hu;Yong Zhang;Yuanpeng Xie;Bao Liu;Yiwang Chen
通过在活性层中引入少量的聚3-丁基噻吩基(P3BT)，证明了7′-(4，4-bis(2-ethylhexyl)-4H-silolo[3，2-b:4，5-b′]dithiophene-2，6-diyl)bis(6-fluoro-4-(5′-hexyl-[2，2′-bithiophen]-5-yl)benzo[c][1，2，5](thiadiazole)(p-DTS(FBTTh2)2)和[6，6]苯基-C71-丁酸甲酯(PC71BM)体系对体相异质结微结构的形态控制。P3BT可以作为非均相成核剂，诱导p-DTS(FBTTh2)2结晶，在整个薄膜中形成相互连接的纳米纤维。此外，加入P3BT后，有源层的相分离尺寸增大，薄膜表面粗糙度增加。因此，当P3BT含量达到10wt%时，器件的功率转换效率从3.4%提高到5.0%，这是由于有源层对光的吸收增强，以及更高和更平衡的空穴和电子迁移率。
Morphological control over the bulk heterojunction (BHJ) microstructure of 7′-(4,4-bis(2-ethylhexyl)-4H-silolo[3,2-b:4,5-b′]dithiophene-2,6-diyl)bis(6-fluoro-4-(5′-hexyl-[2,2′-bithiophen]-5-yl)benzo[c][1,2,5](thiadiazole) (p-DTS(FBTTh2)2) and [6,6]phenyl-C71-butyric acid methyl ester (PC71BM) system was demonstrated by introducing a small amount of poly(3-butylthiophene) (P3BT) into the active layer. The P3BT could serve as a heterogeneous nucleating agent, inducing the crystallization of p-DTS(FBTTh2)2 to form interconnected nanofibers throughout the whole film. Moreover, the phase separation sizes of the active layer increased after incorporation of P3BT, accompanied by the enhanced surface roughness of the films. Therefore, the power conversion efficiency of the devices increased from 3.4% to 5.0% as the P3BT content reached 10 wt %, due to the enhanced light absorption of the active layer, as well as the higher and more balanced hole and electron mobility.