Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
4765890 | Dyes and Pigments | 2017 | 30 Pages |
Abstract
Three new random or regular terpolymers (ra-P1, re-P2, and re-P3) based on diketopyrrolopyrrole (DPP) and 5,6-difluorobenzo-[c][1,2,5]thiadiazole (ffBT) as electron-deficient unit (A), alkylthienyl-substituted benzodithiophene (BDTT) as electron-rich units (D) have been designed and synthesized for donor materials in polymer solar cells. The differences on photophysical, electrochemical, and photovoltaic properties of these terpolymers have been investigated. Compared with random terpolymer ra-P1, regular terpolymer re-P2 has stronger absorption band range from 300 to 800Â nm, higher hole mobility and more appropriate surface morphology. With increasing the quantity of DTffBT, regular terpolymer re-P3 showed more stronger absorption band in 300-600Â nm compared to re-P2. The polymer solar cells have been fabricated by using these terpolymers as donor materials and [6,6]-phenyl-C71-butyric acid methyl ester (PC71BM) as the acceptor material. Among them, the device based on re-P3 demonstrated preferable power conversion efficiency of 4.08% with a short-circuit current of 8.23Â mAÂ cmâ2, an open-circuit voltage of 0.76Â V and a fill factor of 65.0%.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
Chao Weng, Huan Guo, Zhiquan Zhang, Jian Zhang, Bin Zhao, Songting Tan,