基于可溶液加工的四臂三苯胺分子的高光电压的有机太阳能电池.docVIP

  A triphenylamine-based four-armed molecule for solution-processed organic solar cells with high 5 10 photo-voltage# HOU Qiong1, Yiquan Chen1, hongyu Zhen2,3* (1. School of Chemistry Environment, South China Normal University, Guangzhou, 510006, China; 2. State key laboratory of Modern Optical Instr umentation, Zhejiang University, Hangzhou 310027, China; 3. Department of Physics, Chemistry and Biology (IFM), Linkoping University, Linkoping SE-581 83, Sweden) Abstract: A new four-armed molecule Th4(DTPAB) with triphenylamine-benzothiadiazole-triphenylamine unit as core, 4-hexylthiophene as arms was 15 synthesized. Solution-processed organic solar cells based on blends of Th4(DTPAB) and 10 PC71BM demonstrate a power conversion efficiency of 3.18% with a big open circuit voltage of 0.96 V. Key words: functional polymer; triphenylamine; organic solar cells; solution-processed 0 Introduction 20 Bulk heterojunction (BHJ) organic solar cells (OSCs) based on blends of solution-processable small molecules and fullerene derivatives (PC61BM or PC71BM) attracted considerable attention in recent years because the small molecules have unique advantages, such as well-defined molecular structure, definite molecular weight, high purity without batch to batch variations in comparison with conjugated polymers [1-5]. Tremendous progress was made in this 25 30 35 40 field [6-13]. And a power conversion efficiency (PCE) of 7.38% has been achieved from the OSCs based on a solution-processable linear small molecule and PC71BM [9]. However, few soluble small molecules used as electron donors in OSCs demonstrated decent PCEs compare with their polymer counterparts and therefore more molecules need to be synthesized and evaluated in OSCs. Comparing with linear small molecules, star-shaped molecules with three dimensional (3D) structures have better miscibility with PCBM because the arms of these molecules can hold the fullerene balls [14, 15]. O