National Center for Nanoscience and Technology, Beijing, China.
Macromol Rapid Commun. 2012 Sep 26;33(18):1574-9. doi: 10.1002/marc.201200311. Epub 2012 Jul 2.
A novel electron-accepting unit cyclopenta[2,1-b:3,4-c']dithiophene-4-one (CPDTO-c'), which is an isomer of CPDTO-b' was developed. CPDTO-c' can be incorporated into the D-A backbone through 5, 7 positions. The 2 position of CPDTO-c' can be easily functionalized with an electron-withdrawing chain. By copolymerizing CPDTO-c' with four different donor units: benzo[1,2-b:4,5-b']dithiophene (BDT), dithieno[3,2-b:2',3'-d]silole (DTS), carbazole, and fluorene, four new conjugated copolymers P1-P4 were obtained. All these polymers have good solubility and low-lying HOMO energy levels (-5.41 ∼ -5.92 eV). Among them, P1 and P2 exhibit broad absorption and narrow optical bandgaps of 1.91 and 1.72 eV, respectively. Solar cells based on P1/PC(71) BM afforded a PCE up to 2.72% and a high V(oc) up to ∼0.9 V.
开发了一种新型的电子受体单元环戊[2,1-b:3,4-c']二噻吩-4-酮（CPDTO-c'），它是 CPDTO-b'的异构体。CPDTO-c'可以通过 5、7 位被整合到 D-A 主链中。CPDTO-c'的 2 位可以很容易地被一个吸电子链官能化。通过将 CPDTO-c'与四个不同的给体单元：苯并[1,2-b:4,5-b']二噻吩（BDT）、二噻吩并[3,2-b:2',3'-d]硅（DTS）、咔唑和芴共聚，得到了四个新的共轭聚合物 P1-P4。所有这些聚合物都具有良好的溶解性和低的 HOMO 能级（-5.41 到-5.92 eV）。其中，P1 和 P2 表现出宽的吸收和窄的光学带隙，分别为 1.91 和 1.72 eV。基于 P1/PC(71)BM 的太阳能电池提供了高达 2.72%的 PCE 和高达约 0.9 V 的高 V(oc)。
