Effect of a π-linker of push–pull D–π–A donor molecules on the performance of organic photodetectors
作者:Hong Chul Lim、Min-Soo Choi、Sangmin Chae、Hyo Jung Kim、Jang-Joo Kim、Jong-In Hong
DOI:10.1039/d0tc02168g
日期:——
We report organic photodetectors (OPDs) exhibiting high photocurrent density (Jph), low dark current density (Jd), and broadband external quantum efficiency (EQE) based on three push–pull type D–π–A small molecule donors (H1, H2, and H3) with different π-linker structures. Among the three donor molecules, H2 with a long π-linker had stronger intermolecular interactions and formed a polycrystalline
我们报告了基于三个推挽型D–π–A小分子供体(H1)的有机光电探测器(OPD),它们显示出高光电流密度(J ph),低暗电流密度(J d)和宽带外部量子效率(EQE),H2和H3)具有不同的π-接头结构。在这三个供体分子中,具有长π接头的H2具有更强的分子间相互作用并形成多晶结构,从而在界面处产生亚空位态和陷阱位点,从而增加了J d因为从氧化铟锡电极的供体在反偏的状态易化电子注入的OPD调制的值和所述减小Ĵ的pH值。相反,由于分子间的相互作用较弱,具有短π接头的H3在薄膜中显示出非晶形态,这降低了平面异质结(PHJ)OPD和体异质结(BHJ)OPD的J d值。的BHJ OPD调制与H3在530nm处,低表现出64%的EQE宽带值Ĵ d的1.8×10值-8,和高Ĵ pH值9.6×10的值-3甲厘米-2在-3 V偏压。