A new donorâacceptor type copolymer, namely poly4,8-bis(2-ethylhexyloxy)benzo[1,2-b:3,4-bâ²]difuran-alt-6-octylnaphtho[2,3-c]thiophene-4,9-dione} (PBDFNTDO) was synthesized by a Stille coupling reaction and characterized by 1H NMR, GPC, TGA, UV-Vis absorption spectroscopy and cyclic voltammetry. PBDFNTDO is readily soluble in common organic solvents with a number-average molecular weight (Mn) of 10.7 kDa molâ1 and a polydispersity index of 1.71. TGA analysis shows the copolymer exhibits good thermal stability with 5% weight loss at a temperature of 341 °C. PBDFNTDO possesses a broad absorption band at 300â750 nm with an optical bandgap of 1.65 eV. Cyclic voltammetry gives HOMO and LUMO energy levels of â5.33 eV and â3.40 eV, respectively. The hole mobility of PBDFNTDO:PC71BM (1â:â1.5, w/w) reaches up to 5.0 à 10â3 cm2 Vâ1 sâ1 by the space-charge-limited current (SCLC) method. A polymer solar cell with the configuration of ITO/PEDOT:PSS/PBDFNTDO:PC71BM (1â:â1.5, w/w)/Ca/Al demonstrates a promising power conversion efficiency of 4.71% under the illumination of AM 1.5 G, 100 mW cmâ2.
通过斯蒂尔偶联反应合成了一种新型供体-受体型共聚物,即聚4,8-双(2-乙基己氧基)苯并[1,2-b:3,4-bâ²]二
呋喃-alt-6-辛基
萘并[2,3-c]
噻吩-4,9-二酮}(
PBDFNTDO),并利用 1H NMR、
GPC、TGA、紫外-可见吸收光谱和循环伏安法对其进行了表征。
PBDFNTDO 易溶于普通有机溶剂,平均分子量(Mn)为 10.7 kDa MOlâ1 ,多分散指数为 1.71。TGA 分析表明,这种共聚物具有良好的热稳定性,在 341 °C 的温度下重量损失率为 5%。
PBDFNTDO 在 300â750 纳米波长处具有宽吸收带,光带隙为 1.65 eV。循环伏安法得出的HOMO和LUMO能级分别为5.33 eV和3.40 eV。通过空间电荷限制电流(SCLC)法,
PBDFNTDO:PC71BM(1â:â1.5,w/w)的空穴迁移率高达5.0 Ã 10â3 cm2 Vâ1 sâ1。采用ITO/PEDOT:PSS/
PBDFNTDO:PC71BM (1â:â1.5, w/w)/Ca/Al配置的聚合物太阳能电池在
AM 1.5 G、100 mW cmâ2的光照下显示出4.71%的功率转换效率。