Enhancing performance of ternary blend photovoltaics by tuning the side chains of two-dimensional conjugated polymer

Chung Hao Chen, Yi Ju Lu, Yu Wei Su, Yu Che Lin, Hsi Kuei Lin, Hsiu Cheng Chen, Hao Cheng Wang, Jia Xing Li, Kaung-Hsiung Wu, Kung-Hwa Wei*

*此作品的通信作者

研究成果: Article同行評審

23 引文 斯高帕斯(Scopus)

摘要

We prepared the ternary blends active layer by incorporating a new two-dimensional donor-acceptor (D/A) conjugated polymer (BDTTBO) comprising benzo-dithiophene-thiophene-thiophene-benzo oxadiazole chemical units that has three different conjugated side chains bithiophene (BT), benzothiophene (BzT) and thienothiophene (TT) BDTTBO-BT, BDTTBO-BzT and BDTTBO-TT into poly (benzodithiophene-fluorothienothiophene) (PTB7-TH) and PC71BM as for organic photovoltaics (OPVs). We expected that incorporating these BDTTBO with different side chains into the blend of PTB7-TH and PC71BM not only can broaden the absorption of solar spectrum thereby increasing short-circuit current density but also tune the packing of PTB7-TH and the dispersion of PC71BM. In particular, we found that incorporating 10% of BDTTBO-BT to form the PTB7-TH: BDTTBO-BT: PC71BM ternary blend (active layer) device could improve the power conversion efficiency to 10.4% from 9.0% for the binary blend of PTB7-TH: PC71BM device—a relative increase of 15%. We examined the packing orientations of the PBDTTBO: PTB7-TH:PC71BM ternary blend films using synchrotron two-dimensional grazing-incidence wide-angle X-ray scattering, and found that the incorporation of 10% relatively higher crystallinity PBDTTBO-BT, PBDTTBO-BzT or PBDTTBO-TT not only altered the packing orientation of PTB7-TH substantially but also reduced PC71BM cluster size in the ternary blend system, as compared to that in the case of PTB7-TH with PC71BM binary blend, thereby providing more pathways for electrons and thus enhancing the carrier transport in the ternary blend, as evidenced by the carrier mobility.

原文English
頁(從 - 到)185-193
頁數9
期刊Organic Electronics
71
DOIs
出版狀態Published - 1 8月 2019

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