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题名:
New Insights into the Correlation between Morphology, Excited State Dynamics, and Device Performance of Small Molecule Organic Solar Cells
作者: Long, GK; Wu, B; Solanki, A; Yang, X; Kan, B; Liu, XF; Wu, DC; Xu, Z; Wu, WR; Jeng, US; Lin, JY; Li, MM; Wang, YC; Wan, XJ; Sum, TC; Chen, YS
刊名: Advanced Energy Materials
出版日期: 2016
卷号: 6, 期号:22, 页码:-
关键词: charge transfer state ; optical simulation ; organic photovoltaics ; small molecules ; transient absorption spectra
DOI: 10.1002/aenm.201600961
通讯作者: Chen, YS (reprint author), Nankai Univ, Collaborat Innovat Ctr Chem Sci & Engn Tianjin, State Key Lab & Inst Elementoorgan Chem, Sch Mat Sci & Engn, Tianjin 300071, Peoples R China. ; Sum, TC (reprint author), Nanyang Technol Univ, SPMS, Div Phys & Appl Phys, 21 Nanyang Link, Singapore 637371, Singapore.
文章类型: 期刊论文
英文摘要: Morphology plays a vital role on the performance of organic photovoltaics. However, our understanding of the morphology-performance relationships for organic photovoltaics remains lacking. Specifically, it is still an open question why some bulk-heterojunction blends exhibit electric field dependent J-V curves, while others do not. Through detailed fs-s transient absorption spectroscopy and morphology studies on the representative bulk-heterojunction type small molecule (SM) donor system, a picture of different J-V behaviors from morphology aspects and excited dynamics is revealed. Our findings reveal that amorphous morphology in the lack of percolated pathways leads to the formation of strongly bound charge transfer states (CTSs), which accounts for about one third of the photoexcited species. Therefore, field-dependent J-V curves are obtained as these CTSs mainly undergo geminate recombination or function as interfacial traps for nongeminate recombination. On the other hand, the CTSs are totally suppressed after post-treatment owning to the formation of bicontinuous morphology, which results in very high efficiencies from exciton generation, diffusion, dissociation to charge extraction, thus contributes to field-independent J-V characteristics. The insights gained in this work provide the effective guidelines to further optimize the performance of bulk-heterojunction type SM-organic photovoltaics through judicious morphology control and engineering.
收录类别: SCI
语种: 英语
WOS记录号: WOS:000388993100005
ISSN号: 1614-6832
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.sinap.ac.cn/handle/331007/26585
Appears in Collections:中科院上海应用物理研究所2011-2017年_期刊论文

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Recommended Citation:
Long, GK,Wu, B,Solanki, A,et al. New Insights into the Correlation between Morphology, Excited State Dynamics, and Device Performance of Small Molecule Organic Solar Cells[J]. Advanced Energy Materials,2016-01-01,6(22):-.
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