Chi, Liang-ChenLiang-ChenChiChen, Hsiao-FanHsiao-FanChenHung, Wen-YiWen-YiHungHsu, Yu-HsiangYu-HsiangHsuFeng, Ping-ChiPing-ChiFengChou, Shu-HuaShu-HuaChouLiu, Yi-HungYi-HungLiuKEN-TSUNG WONGYU-HSIANG HSU2020-04-282020-04-2820130927-0248https://scholars.lib.ntu.edu.tw/handle/123456789/486532A novel donor-acceptor (D-A) donor molecule, 1, comprising of two di-p-tolylamino donors and a dicyanovinylene acceptor bridged by a planar and rigid fluorene moiety has been synthesized and characterized. The molecular structure and crystal packing of 1 was characterized by single-crystal X-ray crystallography. Such molecular configuration endowed 1 with an efficient D-A interaction, rendering an intense ICT absorption band for efficiently light-harvesting and retain low-lying HOMO for generating sufficient open-circuit voltage (Voc). The vacuum-deposited hybrid planar-mixed heterojunction (PMHJ) photovoltaic devices utilizing 1 as donor and C70 as acceptor to achieve power conversion efficiencies (PCEs) of 4.04 and 5.31% for the single- and tandem-cell photovoltaic devices under simulated AM 1.5 illumination (100 mW cm-2). © 2012 Elsevier B.V. All rights reserved.[SDGs]SDG7Crystal packings; Dicyanovinylene; Donor molecules; Donor-acceptors; Fluorene moiety; Light-harvesting; Molecular configurations; Organic solar cell; Photovoltaic devices; Power conversion efficiencies; Single crystal X-ray crystallography; Small molecules; Conversion efficiency; Heterojunctions; Molecules; Open circuit voltage; Photovoltaic cells; X ray crystallography; Synthesis (chemical)journal article10.1016/j.solmat.2012.10.019WOS:000326858500005