High efficiency all-polymer solar cells realized by the synergistic effect between the polymer side-chain structure and solvent additive

被引:79
作者
Yuan, Jianyu [1 ]
Ma, Wanli [1 ]
机构
[1] Soochow Univ, Collaborat Innovat Ctr Suzhou Nano Sci & Technol, Jiangsu Key Lab Carbon Based Funct Mat & Devices, Inst Funct Nano & Soft Mat FUNSOM, Suzhou, Peoples R China
基金
国家高技术研究发展计划(863计划); 中国国家自然科学基金; 国家教育部博士点专项基金资助;
关键词
FIELD-EFFECT TRANSISTORS; PERFORMANCE; DESIGN; AGGREGATION; MORPHOLOGY; PAIR;
D O I
10.1039/c4ta06648k
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
By adopting a series of donor-acceptor (D-A) polymers containing Benzo[1,2-b: 4,5-b'] dithiophene (BDT) and thieno[3,4-c] pyrrole-4,6-dione (TPD) with different numbers of alkyl aromatic side-chains, we demonstrate a high optimized PCE of 4.35% for all-polymer solar cells by incorporating an n-type polymer N2200. Through systematic characterization of tapping mode atomic force microscopy (AFM), 2-dimensional grazing-incidence X-ray diffraction (2d-GIXD), photoluminescence spectra and peak force-kelvin probe force microscopy (PF-KPFM), we have shown that the introduction of alkyl aromatic side chains to the donor polymer backbone is beneficial for the intermolecular pi-pi stacking and hence improves the polymer crystallinity as well as hole mobility. More importantly, we discovered that conjugated side-chains and additives can work synergistically to restore the intermolecular stacking of donor-acceptor polymers in the as-cast amorphous blend film and meanwhile develop fine phase segregation for efficient exciton dissociation and transport. As a result, the donor polymer PTP8 with fully alkyl aromatic side chains demonstrated an improved short-circuit current density (J(sc)), a high open-circuit voltage (V-oc) of similar to 1.00 V and a power conversion efficiency (PCE) of 4.35% after the addition of 0.5% DIO, which is among the highest reported efficiencies for all polymer solar cells.
引用
收藏
页码:7077 / 7085
页数:9
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