Enhancement of charge transport properties of small molecule semiconductors by controlling fluorine substitution and effects on photovoltaic properties of organic solar cells and perovskite solar cells
作者:Jae Hoon Yun、Sungmin Park、Jin Hyuck Heo、Hyo-Sang Lee、Seongwon Yoon、Jinback Kang、Sang Hyuk Im、Hyunjung Kim、Wonmok Lee、BongSoo Kim、Min Jae Ko、Dae Sung Chung、Hae Jung Son
DOI:10.1039/c6sc02448c
日期:——
of small molecules based on 7,7′-(4,4-bis(2-ethylhexyl)-4H-silolo[3,2-b:4,5-b′]dithiophene-2,6-diyl)bis(4-(5′-hexyl-[2,2′-bithiophene]-5-yl)benzo[c][1,2,5]thiadiazole) with different fluorine substitution patterns (0F–4F). Depending on symmetricity and numbers of fluorine atoms incorporated in the benzo[c][1,2,5]thiadiazole unit, they show very different optical and morphological properties in a film
我们基于7,7'-(4,4-双(2-乙基己基)-4 H -silolo [3,2- b:4,5 - b '] dithiophene-2,6-制备了一系列小分子具有不同氟取代方式(0F-4F)的二基)双(4-(5'-己基-[2,2'-联噻吩] -5-基)苯并[ c ] [1,2,5]噻二唑)。取决于并入苯并[ c ] [1,2,5]噻二唑单元中的氟原子的对称性和数量,它们在膜中显示出非常不同的光学和形态学性质。与1F相比,具有对称和偶数个氟取代图形的2F和4F在薄膜中显示出改进的分子堆积结构和更高的结晶性和3F,因此2F达到了最高的OTFT迁移率,其次是4F。在使用PC 71 BM制造的体异质结太阳能电池中,2F以8.14%的效率实现了最高的光伏性能,而0F则以1.28%的效率实现了最低的效率。此外,以2F作为无掺杂空穴传输材料制备的平面型钙钛矿太阳能电池(PSC)由于其高的电荷传输性能而显示出14