New Conjugated Molecules with Two and Three Dithienyldiketopyrrolopyrrole (DPP) Moieties Substituted at<i>meta</i>Positions of Benzene toward p- and n-Type Organic Photovoltaic Materials
Two conjugatedmolecules, TADPP3 and TADPP2‐TT, are reported, in which three and two dithienyldiketopyrrolopyrrole (DPP) moieties, respectively, are substituted at the meta positions of benzene. Based on cyclic voltammetry and absorption data, TADPP3 and TADPP2‐TT possess similar HOMO and LUMO energies of about −5.2 and −3.4 eV, respectively. Thin films of TADPP3 and TADPP2‐TT exhibit p‐type semiconducting
据报道,有两个共轭分子TADPP3和TADPP2-TT,其中三个和两个二噻吩二酮基吡咯并吡咯(DPP)部分分别在苯的间位取代。根据循环伏安法和吸收数据,TADPP3和TADPP2-TT具有相似的HOMO和LUMO能量,分别约为-5.2和-3.4 eV。TADPP3和TADPP2-TT薄膜在热退火后表现出p型半导体行为,空穴迁移率分别为2.36×10 -3和3.76×10 -4 cm 2 V -1 s -1。分子TADPP3将TADPP2-TT和TADPP2-TT与p C 71丁酸甲酯(PC 71 BM)和苯基C 61丁酸甲酯(PC 61 BM)混合后用作p型光伏材料。基于AFM和XRD研究,相对较低的J SC和填充因子值可归因于较差的胶片形态。TADPP3薄膜与PC 71 BM重量比为1:2的太阳能电池表现出高开路电压(V OC)的0.99 V电压和2.47%的功率转换效率(PCE)