A new two-dimensional donor/acceptor copolymer based on 4,8-bis(2′-ethylhexylthiophene)thieno[2,3-f]benzofuran for high-performance polymer solar cells

2,1,3‐Benzothiadiazole‐5,6‐Dicarboxylic Imide – A Versatile Building Block for Additive‐ and Annealing‐Free Processing of Organic Solar Cells with Efficiencies Exceeding 8%

“…Building on the BT motif, the free 5- and 6-positions have proven to be useful locations for attaching either electron-donating or electron-withdrawing substituents in order to adjust the frontier molecular orbitals in the resulting copolymers as well as to often enhance solubility. 11 This approach is illustrated in Figure 1 where the dialkoxy-functionalized BT (O2BT) moiety represents a weaker electron-accepting, and more soluble moiety than the parent BT moiety, 12 while the 5,6-difluoro-2,1,3-benzothia­diazole (F2BT) system correspondingly represents a stronger electron-accepting unit. In particular, fluorination of the BT moiety has led to many new high-performing OPV materials.…”

Research Progress of the FuranContaining Fused Ring Conjugated Organic Molecules and Polymers

“…Sista 等 [50] 在 BDF 上引入苯乙炔癸基, 设计合成了 一种新的聚合物 P23, 同时与他们之前所制备的噻吩类 似物的聚合物 [51] [52,53] . 和传统的在苯环上引入基团不同, Kobilka 等 [54] 在 BDF 核的呋喃环上引入了烷基基团, 并与在噻吩的不 同位置取代有烷基链的基团相连, 得到了一种富电子的 T in/out BDF 单元, 为了研究它们的光伏性能的变化, 作 者设计合成了两种聚合物 PT out BDFID 和 PT in BDFID (P25 和 P26), 如图 37, P25 和 P26 拥有相同的 HOMO 能级(-5.7 eV)、 LUMO 能级(-3.8 eV)和 E g (1.9 eV), 电 池性能 P25 (PCE＝0.301%, 我们组 [56] 对 TBF 为核的相关衍生物做了一系列的 研究, 2014 年报道了在 TBF 核上引入噻吩烷基链的 TBF 衍生物并与烷氧基苯并噻二唑衍生物聚合, 得到 了聚合物 PTBFTDTBT (P30), 如图 39, 该聚合物具有 分子量大、吸光范围广和溶解性好等优点, 其 HOMO 能级为-5.20 eV, LUMO 能级为-3.57 eV, 测得 P30 的 SCLC 空穴迁移率为 61; 随后, 通过在苯并噻二唑上引入氟 和在噻吩上引入烷基链来探究不同的受体单元对 TBF 衍生物的影响, 合成出了聚合物 TBFBT [57] (P31), 测得 HOMO/LUMO 能级为-5.11 eV/-3.49 eV, 应用在太阳 电池中得到了 4.1%的效率, 当添加 3%的 DIO 后, 测得…”

Synthesis and Photovoltaic Properties of a Copolymer based on thieno [2, 3-f] benzofuran and thienopyrroledione

“…The monomer TBF-T was synthesized according to the literature [6], and the other monomer TPD was prepared by following literature procedure [7]. UV-Vis spectra was studied via a Beijing Purkinje General-TU-1901 spectrophotometer.…”