標題: Enhancing performance of ternary blend photovoltaics by tuning the side chains of two-dimensional conjugated polymer
作者: Chen, Chung-Hao
Lu, Yi-Ju
Su, Yu-Wei
Lin, Yu-Che
Lin, Hsi-Kuei
Chen, Hsiu-Cheng
Wang, Hao-Cheng
Li, Jia-Xing
Wu, Kaung-Hsiung
Wei, Kung-Hwa
交大名義發表
材料科學與工程學系
電子物理學系
National Chiao Tung University
Department of Materials Science and Engineering
Department of Electrophysics
關鍵字: Ternary blend organic solar cells;Side chain engineering;Donor-acceptor conjugated polymer;Two-dimensional grazing-incidence wide-angle X-ray scattering;Two-dimensional grazing-incidence small-angle X-ray scattering;Organic photovoltaics
公開日期: 1-Aug-2019
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.
URI: http://dx.doi.org/10.1016/j.orgel.2019.05.002
http://hdl.handle.net/11536/152397
ISSN: 1566-1199
DOI: 10.1016/j.orgel.2019.05.002
期刊: ORGANIC ELECTRONICS
Volume: 71
起始頁: 185
結束頁: 193
Appears in Collections:Articles