Xiaopeng Zhou,Jiejun Ren,Wenlei Cao,Andries Meijerink,Yuhua Wang
Colloidal indium phosphide quantum dots (In(Zn)P/ZnS QDs) show potential for application in the field of light emitting diodes (LED) and Mini/Micro-LEDs displays due to their tunable emission and low toxicity. However, the performance of blue-emitting indium phosphide QDs is still lagging behind that of red and green. Herein, a facile method to overcome this difficulty is proposed. The highly active Zn(ClO 4 ) 2 precursor is injected into the reaction mixture during the nucleation process to enhance zinc incorporation, which generates the In(Zn)P alloy QDs with enlarged bandgap. At the same time, the increase of zinc content can inhibit excessive growth of In(Zn)P QDs, and significantly improve its size distribution. The monodisperse In(Zn)P/ZnS QDs exhibit excellent blue emission (466 nm) and have the narrowest full width at half maxima (41 nm) of blue emission In(Zn)P QDs ever reported. This work provides a feasible and effective strategy for obtaining narrow-band blue-emitting In(Zn)P/ZnS QDs.
Abstract
In the present work, Cu 2 ZnSnS 4 (CZTS) nanoparticles (NPs) for use in low-cost thin film solar cells were successfully synthesized using a facile open-air solution route. Copper(II) chloride dihydrate, zinc(II) acetate dihydrate, tin(II) chloride, and thiourea were used as reagents, and oleylamine was employed as solvent. The effect of varying the Zn content in the precursor solution on the structural, morphological, compositional, and optical properties of the as-synthesized CZTS NPs was investigated via X-ray diffraction, scanning electron microscopy and transmission electron microscopy, energy dispersive X-ray spectroscopy and ultraviolet–visible–infrared spectroscopy, respectively. As observed, the properties of the as-synthesized NPs improved with increasing Zn precursor contents from 0.75 to 1.5 mmol. For instance, the crystallinity of the as-synthesized NPs improved gradually and the band gap energy was tuned from 1.28 to 1.41 eV. The Zn/Sn ratio increased from 0.51 to 0.86, whereas the Cu/(Zn + Sn) ratio decreased from 0.95 to 0.7 with increasing Zn precursor contents. The results indicated that the obtained CZTS NPs, prepared with a Zn precursor content of 1.5 mmol, are a good light-absorbing layer material for application in thin film solar cells. Graphical Abstract
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