Highly Efficient Nonfullerene Polymer Solar Cells Enabled by a Copper(I) Coordination Strategy Employing a 1,3,4-Oxadiazole-Containing Wide-Bandgap Copolymer Donor

被引:70
作者
Xu, Xiaopeng [1 ,2 ]
Li, Zuojia [1 ,2 ]
Bi, Zhaozhao [3 ]
Yu, Ting [1 ,2 ]
Ma, Wei [3 ]
Feng, Kui [1 ,2 ]
Li, Ying [1 ,2 ]
Peng, Qiang [1 ,2 ]
机构
[1] Sichuan Univ, Coll Chem, Minist Educ, Key Lab Green Chem & Technol, Chengdu 610064, Sichuan, Peoples R China
[2] Sichuan Univ, State Key Lab Polymer Mat Engn, Chengdu 610064, Sichuan, Peoples R China
[3] Xi An Jiao Tong Univ, State Key Lab Mech Behav Mat, Xian 710049, Shaanxi, Peoples R China
关键词
1,3,4-oxadiazole; copper(I) coordination strategy; morphology optimization; nonfullerene polymer solar cells; wide-bandgap copolymer; ORGANIC PHOTOVOLTAICS; SMALL-MOLECULE; STRUCTURAL-CHARACTERIZATION; 13-PERCENT EFFICIENCY; ELECTRON-ACCEPTOR; SIDE-CHAINS; PERFORMANCE; OXADIAZOLE; TRANSISTOR; COMPLEXES;
D O I
10.1002/adma.201800737
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
A novel wide-bandgap copolymer of PBDT-ODZ based on benzo[1,2-b:4,5-b]dithiophene (BDT) and 1,3,4-oxadiazole (ODZ) blocks is developed for efficient nonfullerene polymer solar cells (NF-PSCs). PBDT-ODZ exhibits a wide bandgap of 2.12 eV and a low-lying highest occupied molecular orbital (HOMO) level of -5.68 eV, which could match well with the low-bandgap acceptor of 3,9-bis(2-methylene-(3-(1,1-dicyanomethylene)-indanone)-5,5,11,11-tetrakis(4-hexylthienyl)-dithieno[2,3-d:2,3-d]-s-indaceno[1,2-b:5,6-b]-dithiophene (ITIC-Th), inducing a good complementary absorption from 300 to 800 nm and a minimal HOMO level offset (0.1 eV). The PBDT-ODZ:ITIC-Th devices exhibit a large open-circuit voltage (V-oc) of 1.08 eV and a low energy loss (E-loss) of 0.50 eV, delivering a high power conversion efficiency (PCE) of 10.12%. By adding a small amount of copper(I) iodide (CuI) as an additive to form coordination complexes in the active blends, much higher device performances are achieved due to the improved absorption and crystallinity. After incorporating 4% of CuI, the PCE is elevated to 12.34%, with a V-oc of 1.06 V, a J(sc) of 17.1 mA cm(-2) and a fill factor of 68.1%. This work not only provides a novel oxadiazole-containing wide-bandgap polymeric donor candidate for high-performance NF-PSCs but also presents an efficient morphology-optimization approach to elevate the PCE of NF-PSCs for future practical applications.
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页数:8
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