Author: Pi, Xiaodong ; Chen, Gangshu ; Song, Yanlin ; Han, Liyuan ; Yang, Deren ; Li, Zehua ; Cheng, Yajie ; Li, Pengwei ; Zhang, Yiqiang ; Yu, Xuegong

Inkjet printing method is one of the most effective ways for fabricating large-area perovskite solar cells (PSCs). However, because ink crystallizes rapidly during printing, the printed perovskite film is discontinuous with increasing defects. It severely restricts the application of the inkjet printing technology to the fabrication of perovskite photovoltaic devices. Here, we designed a new mixed-cation perovskite ink system that can controllably retard the crystallization rate of perovskite. In this new ink system, the printing solvent is composed of n-methyl pyrrolidone (NMP) and dimethyl formamide (DMF), and PbX₂ is replaced by PbX₂-DMSO (X = Br, I) complex as a printing precursor to create a high-quality perovskite layer. Accordingly, the printed Cs_0.05MA_0.14FA_0.81PbI_2.55Br_0.45 perovskite film exhibited high homogeneity with a large grain size (over 500 nm). Besides, the printed perovskite film possessed lower defects with improved carrier lifetime compared to the control sample. Combining these advantages, the printed PSC delivers decent power conversion efficiencies (PCEs) of 19.6% (0.04 cm²) and 17.9% (1.01 cm²). The large-area device can still retain its original efficiency of 89% when stored in air with humidity less than 20% for 1000 h.

31 Jul 2019·ACS OmegaQ3 · CHEMISTRY

Colloidal and Immobilized Nanoparticles of Lead Xanthates

Q3 · CHEMISTRY

ArticleOA

Author: Fetisova, Olga Yu. ; Novikova, Svetlana A. ; Zharkov, Sergey M. ; Saikova, Svetlana V. ; Vorobyev, Sergey A. ; Mikhlin, Yuri L. ; Likhatski, Maxim N. ; Krylov, Alexander S.

Although nanoparticles of heavy metal xanthates and their hydrosols can play important roles in froth flotation, environmental issues, analytics, and manufacturing of metal sulfide nanocomposites, they have received little attention. We studied colloidal solutions and immobilized particles prepared via interaction of aqueous lead nitrate with alkyl xanthates applying UV-vis absorption spectroscopy, dynamic light scattering, zeta potential measurement, thermogravimetry analysis, Fourier transform infrared spectroscopy, Raman scattering, X-ray photoelectron spectroscopy, atomic force microscopy, and transmission electron microscopy. The hydrodynamic diameter of colloidal particles of Pb(SSCOR)₂ decreased from 500 to 50 nm with an increase in the alkyl radical length and the initial xanthate to lead ratio (X/Pb); the zeta potential magnitude varied similarly, although it remained negative. The effect of pH in the range of 4.5-11 was minor, but the colloids produced using excess of Pb²⁺ in alkaline media were close to PbX and decomposed much easier than PbX₂. The uptake of lead xanthates on supports was generally low because of negative charges of the colloids; however, 50-100 nm thick PbX₂ films were deposited on PbS and SiO₂ from the media of X/Pb < 2 and pH < 9 because of preadsorption of Pb²⁺, while nanorods formed on highly oriented pyrolytic graphite.

15 Feb 2019·Nanotechnology

Tunable dual emission in Mn²⁺-doped CsPbX₃ (X = Cl, Br) quantum dots for high efficiency white light-emitting diodes

Article

Author: Chen, Weiwei ; Zang, Zhigang ; Shi, Yue ; Yang, Zhaoqi ; Tang, Xiaosheng ; Du, Juan

Doping of Mn²⁺ into semiconductor nanocrystals has been demonstrated to endow them with novel electronic, optical and magnetic functionalities. In this paper, Mn-doped CsPbX₃ (X = Br, Cl) quantum dots (QDs) were synthesized at room temperature via a facile strategy by introducing dimethyl sulfoxide (DMSO)-MnBr₂/PbX₂ composite as a precursor. The excitonic emission spectra of the as-obtained Mn-doped CsPbX₃ QDs can be tuned from 517 nm to 418 nm by adjusting the ratio of PbBr₂/PbCl₂ precisely, and the luminescence mechanism of the doped QDs is discussed in detail. Moreover, the highest photoluminescence quantum yield of the Mn²⁺ emission achieves 36.7%, which is comparable with QDs prepared by the conventional hot-injection method. Depending on the ratios of PbPb₂/PbCl₂, the energy transfer rate from the band-edge to Mn²⁺ excited state is in the range of 0.006-20.42 × 10⁷ s^-1. Furthermore, white light-emitting diodes (LEDs) were successfully fabricated by combining the as-prepared Mn-doped CsPbX₃ QDs with commercial UV GaN chips, and the high luminous efficiency of the as-prepared white LEDs was developed to 55.9 lm W^-1. This work strongly supports the fact that Mn-doped CsPbX₃ QDs are promising materials for application in lighting and displaying fields.

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Indication	Highest Phase	Country/Location	Organization	Date
Triple Negative Breast Cancer	Preclinical	KR	Pinotbio, Inc.	11 Jan 2024

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