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- Bi, Zhaozhao, et al.
(author)
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Individual nanostructure optimization in donor and acceptor phases to achieve efficient quaternary organic solar cells
- 2019
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In: Nano Energy. - : ELSEVIER. - 2211-2855 .- 2211-3282. ; 66
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Journal article (peer-reviewed)abstract
- Fullerene derivative (PC71BM) and high crystallinity molecule (DR3TBDTT) are employed into PTB7-Th:FOIC based organic solar cells (OSCs) to cooperate an individual nanostructure optimized quaternary blend. PC71BM functions as molecular adjuster and phase modifier promoting FOIC forming "head-to-head" molecular packing and neutralizing the excessive FOIC crystallites. A multi-scale modified morphology is present thanks to the mixture of FOIC and PC71BM while DR3TBDTT disperses into PTB7-Th matrix to reinforce donors crystal-linity and enhance domain purity. Morphology characterization highlights the importance of individually optimizated nanostructures for donor and acceptor, which contributes to efficient hole and electron transport toward improved carrier mobilities and suppressed non-geminated recombination. Therefore, a power conversion efficiency of 13.51% is realized for a quaternary device which is 16% higher than the binary device (PTB7-Th:FOIC). This work demonstrates that utilizing quaternary strategy for simultaneous optimization of donor and acceptor phases is a feasible way to realize high efficient OSCs.
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- Pang, Xiaodan, 1986-, et al.
(author)
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Uplink transmission in the W-band (75-110 GHz) for hybrid optical fiber-wireless access networks
- 2013
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In: Microwave and optical technology letters (Print). - : Wiley-Blackwell. - 0895-2477 .- 1098-2760. ; 55:5, s. 1033-1036
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Journal article (peer-reviewed)abstract
- We report on an experimental, W-band, uplink for hybrid fiber-wireless systems which enables high speed communication from the wireless end users to the central server. Overall system performances for an OFDM signal format are discussed in detail.
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| 7. |
- Yan, Han, et al.
(author)
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Lewis Acid Doping Induced Synergistic Effects on Electronic and Morphological Structure for Donor and Acceptor in Polymer Solar Cells
- 2018
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In: Advanced Energy Materials. - : WILEY-V C H VERLAG GMBH. - 1614-6832 .- 1614-6840. ; 8:19
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Journal article (peer-reviewed)abstract
- Due to the attraction of optimizing the electronic structure beyond chemical synthesis, molecular doping has recently aroused wide interest in the field of organic solar cells. However, the selection of limited dopants confines its successful application. Inspired by the Lewis base characteristics of the photovoltaic materials, the Lewis acid as novel dopant is introduced in organic solar cells. In both fullerene and nonfullerene based blends, Lewis acid doping leads to increased photovoltaic performance. Detailed experiments reveal that Lewis acid doping has a synergistic effect on modifying the polymers electronic properties and the acceptors nanostructure even at low doping concentration, and these are simultaneously responsible for the device improvements. Based on the mechanism studies, it is proposed that the Lewis acid-doped polymers anions produce induced dipole on the acceptor, this increases the intermolecular interaction and facilitates the morphology optimization. It is believed that the synergistic effect by Lewis acid doping greatly expands the application of doped organic solar cells, in concert with other existing methods to yield higher efficiency values.
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