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New Insights into the Correlation between Morphology, Excited State Dynamics, and Device Performance of Small Molecule Organic Solar Cells
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; 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.
2016
Source PublicationAdvanced Energy Materials
ISSN1614-6832
Volume6Issue:22Pages:-
Subtype期刊论文
AbstractMorphology 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.
KeywordCharge Transfer State Optical Simulation Organic Photovoltaics Small Molecules Transient Absorption Spectra
DOI10.1002/aenm.201600961
Indexed BySCI
Language英语
WOS IDWOS:000388993100005
Citation statistics
Cited Times:18[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.sinap.ac.cn/handle/331007/26585
Collection中科院上海应用物理研究所2011-2018年
Corresponding AuthorChen, 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.
Recommended Citation
GB/T 7714
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,2016,6(22):-.
APA Long, GK.,Wu, B.,Solanki, A.,Yang, X.,Kan, B.,...&Sum, TC .(2016).New Insights into the Correlation between Morphology, Excited State Dynamics, and Device Performance of Small Molecule Organic Solar Cells.Advanced Energy Materials,6(22),-.
MLA Long, GK,et al."New Insights into the Correlation between Morphology, Excited State Dynamics, and Device Performance of Small Molecule Organic Solar Cells".Advanced Energy Materials 6.22(2016):-.
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