標題: Forced coplanarity of dithienofluorene-based non-fullerene acceptors to achieve high-efficiency organic solar cells
作者: Cao, Fong-Yi
Huang, Po-Kai
Su, Yen-Chen
Huang, Wen-Chia
Chang, Shao-Ling
Hung, Kai-En
Cheng, Yen-Ju
交大名義發表
應用化學系
National Chiao Tung University
Department of Applied Chemistry
公開日期: 14-八月-2019
摘要: Ladder-type structures have been the key element for high performance non-fullerene acceptors (NFAs). In this work, two dithieno[3,2-b:6,7-b ']fluorine (DTF)-based nonfullerene acceptors, non-bridged DTFT5-FIC and carbon-bridged DTFT9-FIC, with an identical conjugated backbone were designed and synthesized for investigation of the planarization effect. The chemical rigidification with forced coplanarity indeed plays a pivotal role in determining the molecular properties. Compared to the non-bridged open-chain DTFT5-FIC counterpart, the nonacyclic ladder-type DTFT9-FIC with a fully planarized backbone exhibits higher thermal stability, bathochromic absorption and higher electron mobility. The devices using PBDB-T as the p-type polymer and fully planar DTFT9-FIC as the acceptor showed a high efficiency of 9.58%, which is superior to that of the device using the partially planar DTFT5-FIC material (5.45%). By incorporating PC71BM as the second acceptor to enhance the absorption at shorter wavelengths, optimize the morphology and facilitate electron transport, the ternary-blend device using PBDB-T:DTFT9-FIC:PC71BM achieved the highest PCE of 11.82% with a V-oc of 0.88 V, a higher J(sc) of 20.59 mA cm(-2), and an FF of 65.27%.
URI: http://dx.doi.org/10.1039/c9ta05116c
http://hdl.handle.net/11536/152698
ISSN: 2050-7488
DOI: 10.1039/c9ta05116c
期刊: JOURNAL OF MATERIALS CHEMISTRY A
Volume: 7
Issue: 30
起始頁: 17947
結束頁: 17953
顯示於類別:期刊論文