- Multifunctional Fullerene Derivative for Interface Engineering in Perovskite Solar Cells
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In perovskite based planar heterojunction solar cells, the interface between the TiO2 compact layer and the perovskite film is critical for high photovoltaic performance. The deep trap states on the TiO2 surface induce several challenging issues, such as charge recombination loss and poor stability etc. To solve the problems, we synthesized a triblock fullerene derivative (PCBB-2CN-2C8) via rational molecular design for interface engineering in the perovskite solar cells. Modifying the TiO2 surface with the compound significantly improves charge extraction from the perovskite layer. Together with its uplifted surface work function, open circuit voltage and fill factor are dramatically increased from 0.99 to 1.06 V, and from 72.2percent to 79.1percent, respectively, resulting in 20.7percent improvement in power conversion efficiency for the best performing devices. Scrutinizing the electrical properties of this modified interfacial layer strongly suggests that PCBB-2CN-2C8 passivates the TiO2 surface and thus reduces charge recombination loss caused by the deep trap states of TiO2. The passivation effect is further proven by stability testing of the perovskite solar cells with shelf lifetime under ambient conditions improved by a factor of more than 4, from ~40 h to ~200 h, using PCBB-2CN-2C8 as the TiO2 modification layer. This work offers not only a promising material for cathode interface engineering, but also provides a viable approach to address the challenges of deep trap states on TiO2 surface in planar perovskite solar cells.
- Li, Yaowen,Zhao, Yue,Chen, Qi,Yang, Yang (Michael),Liu, Yongsheng,Hong, Ziruo,Liu, Zonghao,Hsieh, Yao-Tsung,Meng, Lei,Li, Yongfang,Yang, Yang
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p. 15540 - 15547
(2015/12/26)
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- One-step synthesis of chiral cages
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A novel type of hemispherical cage was synthesized in a one-pot procedure, which displayed good binding properties towards nickel(II). The Royal Society of Chemistry.
- Steinmetz, Vincent,Couty, Fran?ois,David, Olivier R. P.
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supporting information; scheme or table
p. 343 - 345
(2009/05/06)
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- Reduced number of steps for the synthesis of dense and highly functionalized dendrimers
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A series of densely functionalized dendrimers is synthesized using two branched monomers of type AB2 and CD2, in which the A function (NH2) reacts with D (CHO) and the B function (Cl) reacts with C (OH). The reaction has b
- Servin, Paul,Rebout, Cyrille,Laurent, Régis,Peruzzini, Maurizio,Caminade, Anne-Marie,Majoral, Jean-Pierre
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p. 579 - 583
(2007/10/03)
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- Noncovalent side-wall functionalization of single-walled carbon nanotubes
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A family of poly[(m-phenylenevinylene)-co-(p-phenylenevinylene)]s, functionalized in the synthetically accessible C-5 position of the meta-disubstituted phenylene rings have been designed and synthesized: they are essentially poly{(5-alkoxy-m-phenylenevinylene)-co-[(2,5-dioctyloxy-p-phenylene)-vinylene]} (PAmPV) derivatives. A range of these PAwPV polymers have been prepared both (1) by the polymerization of O-substituted 5-hydroxyisophthaldehydes and (2) by chemical modifications carried out on polymers bearing reactive groups at the C-5 positions. PAmPV polymers solubilize SWNT bundles in organic solvents by wrapping themselves around the nanotube bundles. PAmPV derivatives which bear tethers or rings form pseudorotaxanes with rings and threads, respectively. The formation of the polypseudorotaxanes has been investigated in solution by NMR and UV/vis spectroscopies, as well as on silicon oxide wafers in the presence of SWNTs by AFM and surface potential microscopy. Wrapping of these functionalized PAmPV polymers around SWNTs results in the grafting of pseudorotaxanes along the walls of the nanotubes in a periodic fashion. The results hold out the prospect of being able to construct arrays of molecular switches and actuators.
- Star, Alexander,Liu, Yi,Grant, Kevin,Ridvan, Ludek,Stoddart, J. Fraser,Steuerman, David W.,Diehl, Michael R.,Boukai, Akram,Heath, James R.
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p. 553 - 560
(2007/10/03)
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- Double Wittig reactions with 4-carboxybutylidene triphenylphosphorane as the key step in the synthesis of benzene derivatives metadisubstituted with ωω'-difunctionalized six-carbon chains
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Using a double Wittig reaction from diformylbenzene derivatives, a direct synthetic way to 1,3-di(5-carboxypent-1-yl)benzene compounds is discussed.
- Provent, Christophe,Chautemps, Pierre,Gellon, Gisele,Pierre, Jean-Louis
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p. 1393 - 1396
(2007/10/03)
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