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题名: A bi-continuous network structure of p-DTS(FBTTh2)(2)/EP-PDI via selective solvent vapor annealing
作者: Li, Mingguang1, 2; Liang, Qiuju1, 2; Zhao, Qiaoqiao1, 2; Zhou, Ke1, 2; Yu, Xinhong1, 2; Xie, Zhiyuan1, 2; Liu, Jiangang1, 2; Han, Yanchun1, 2
刊名: JOURNAL OF MATERIALS CHEMISTRY C
发表日期: 2016-11-14
卷: 4, 期:42, 页:10095-10104
收录类别: SCI
英文摘要: A critical requirement of small molecule non-fullerene acceptor-based solar cells for efficient charge separation and collection is the formation of interconnected phase-separated domains of 10-20 nm. The phase-separation behavior of small molecule donor 7,7'-(4,4-bis(2-ethylhexyl)-4H-silolo[3,2-b: 4,5-b'] dithiophene-2,6diyl) bis(6-fluoro-4-(5'-hexyl-[2,2'-bithiophen]-5-yl) benzo[c][1,2,5] thiadiazole) (p-DTS(FBTTh2)(2)) and acceptor N, N'-bis(1-ethylpropyl)-perylene-3,4,9,10-tetracarboxylic diimide (EP-PDI) was regulated by donor selective solvent vapor annealing (D-SVA), poor donor solvent vapor annealing (P-SVA) and thermal annealing (TA). It was found that the power conversion efficiency (PCE) was significantly improved from less than 0.2% up to 3.0% after D-SVA. In contrast, a limited improvement of PCE was obtained for P-SVA (1.9%) and TA (1.8%). The difference in the improvement of PCE values was attributed to the formation of a phase-separated structure and the regulation of crystallite sizes under different post treatments. The fibrous crystals of p-DTS(FBTTh2)(2) were formed during D-SVA treatment while the EP-PDI component was in the form of small microcrystals, thus leading to the required interconnected phase-separated structure. As a consequence, the moderate phase-separated morphology accompanied by a pure crystalline phase with a medium size could maximize the carrier transport process without compromising exciton separation efficiency, and thus contributes to the final optimal PCE value of up to 3.0% under D-SVA. For P-SVA or TA treatment, we only observed a significant enhancement of the crystallinity of both p-DTS(FBTTh2)(2) and EP-PDI components, leading to remarkable film coarsening, or even undesired large phase separation, which is detrimental to the exciton diffusion as well as exciton separation processes.
语种: 英语
内容类型: 期刊论文
URI标识: http://ir.iccas.ac.cn/handle/121111/35142
Appears in Collections:高分子物理与化学实验室_期刊论文

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作者单位: 1.Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, 5625 Renmin St, Changchun 130022, Peoples R China
2.Univ Chinese Acad Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China
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