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Alkali Metal Ions: A Secret Ingredient for Metal Nanocluster-Sensitized Solar Cells
摘要： The presence of alkali metal ions (AMIs) during the adsorption of thiolated Au nanoclusters (NCs) onto TiO2 plays a critical role in achieving high power conversion efficiency and suppressing anomalous current?voltage hysteresis in metal nanocluster-sensitized solar cells. This hidden role of the AMIs is intimately related to the adsorption strength between the NCs and TiO2, indicating the importance of seeking a comprehensive understanding of NC?TiO2 interfaces and devising interfacial engineering techniques to support the next advance in light energy conversion applications of NCs.
关键词： alkali metal ions,metal nanoclusters,current?voltage hysteresis,power conversion efficiency,solar cells
更新于2025-09-23 15:21:01
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Enhanced emission from thermally stable Eu3+ doped CaB2Si2O8 red phosphors via alkali metal modification for W-LEDs application
摘要： M+/Eu3+ (M = Li, Na, K) co-doped CaB2Si2O8 phosphors have been synthesized by a solid-state reaction approach. XRD measurements confirm that the phase purity of the CaB2Si2O8 host is maintained after the introduction of alkali metal ions and Eu3+ ions. The emission intensity of Eu3+ ions is enhanced by a factor of 1.75 and 1.55 with the incorporation of Li+ and Na+ ions, respectively, originating from the charge compensation and improved asymmetry in the crystal field, while the addition of K+ ions to the composition results in a decreased luminescence intensity due to the structural-defect-related quenching. Temperature dependent measurement reveals that the prepared phosphor exhibits excellent thermal stability with 81% at 423 K of the integrated emission intensity at 298 K. A white light-emitting diode (W-LED) device is fabricated based on the synthesized Eu3+ doped CaB2Si2O8 red phosphor modified by Li ions. All these results indicate that the synthesized phosphor is a promising red-emitting material for W-LEDs application.
关键词： Red phosphor,Eu3+ ions,W-LEDs,Alkali metal ions
更新于2025-09-16 10:30:52
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Theoretical explanation of strong enhancement of alkali metal ion neutralization on Au nanoclusters
摘要： We present a theoretical study of alkali metal ion neutralization on gold nanoclusters. The experimental time-of-flight measurements show that neutral fraction of alkali metal ions scattered from flat Au surface is low (3%-15%), but it increases up to 50% for small Au clusters. Several possible explanations of alkali metal ions neutralization enhancement on nanoclusters have been proposed earlier, but they do not fully explain existing experimental data. We introduce alternative explanation of neutralization probability enhancement for small clusters. It is based on ion energy level shift due to interaction with image/induced charges, which significantly differs in the case of metallic nanocluster and in the case of flat continuous metallic surface. Another known mechanism is greater neutralization rate on positively charged edge atoms of Au nanocluster. The combination of two mechanisms and difference in atomic radii possibly explains greater neutralization probability enhancement for Na+ in comparison to Li+.
关键词： Resonant Charge Transfer,Low Energy Ion Scattering (LEIS),Alkali Metal Ions,Neutralization Effect
更新于2025-09-09 09:28:46