Colloidal AInSe2 (A = K, Rb, Cs) Nanocrystals with Tunable Crystal and Band Structures

IF 4.8 Q2 NANOSCIENCE & NANOTECHNOLOGY ACS Nanoscience Au Pub Date : 2024-10-11 DOI:10.1021/acsnanoscienceau.4c0002210.1021/acsnanoscienceau.4c00022

Zhaohong Sun, Carlos Mora Perez, Oleg V. Prezhdo* and Richard L. Brutchey*,

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Abstract

Wide band gap AInSe₂ (A = K, Rb, Cs) is an important interlayer material for improving the efficiency of Cu(In,Ga)(S,Se)₂ (CIGS) solar cells. Compared to high-vacuum deposition and solid-state synthesis, a less energy-intensive method is of interest for its fabrication. Herein, we present the rapid, low-temperature colloidal synthesis of AInSe₂ nanocrystals that opens a pathway for convenient solution processing. The crystal structures and electronic band structures of the nanocrystals were studied, and their particle morphology was found to be dependent on the choice of alkali metal and selenium precursors. Homogeneous solid solution (K,Rb,Cs)InSe₂ nanocrystals were synthesized using a mixture of alkali metal precursors. Their compositions, lattice parameters, and band gaps were easily tuned based on the K:Rb:Cs precursor ratio, providing potential for interface engineering of CIGS nanocrystal-based solar cells.

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具有可调晶体和带状结构的胶体 AInSe2（A = K、Rb、Cs）纳米晶体

宽禁带AInSe2 （A = K, Rb, Cs）是提高Cu(In,Ga)(S,Se)2 （CIGS）太阳能电池效率的重要中间层材料。与高真空沉积和固态合成相比，一种能量消耗更少的方法是其制造的兴趣所在。在此，我们提出了快速，低温胶体合成AInSe2纳米晶体，为方便的溶液处理开辟了一条途径。研究了纳米晶体的晶体结构和电子带结构，发现其颗粒形态与碱金属和硒前驱体的选择有关。采用碱金属前驱体的混合物合成了均相固溶体（K,Rb,Cs）InSe2纳米晶。基于K:Rb:Cs前驱体比可以很容易地调整它们的组成、晶格参数和带隙，为CIGS纳米晶太阳能电池的界面工程提供了潜力。

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来源期刊

ACS Nanoscience Au 材料科学、纳米科学-

CiteScore

4.20

自引率

0.00%

发文量

期刊介绍： ACS Nanoscience Au is an open access journal that publishes original fundamental and applied research on nanoscience and nanotechnology research at the interfaces of chemistry biology medicine materials science physics and engineering.The journal publishes short letters comprehensive articles reviews and perspectives on all aspects of nanoscience and nanotechnology:synthesis assembly characterization theory modeling and simulation of nanostructures nanomaterials and nanoscale devicesdesign fabrication and applications of organic inorganic polymer hybrid and biological nanostructuresexperimental and theoretical studies of nanoscale chemical physical and biological phenomenamethods and tools for nanoscience and nanotechnologyself- and directed-assemblyzero- one- and two-dimensional materialsnanostructures and nano-engineered devices with advanced performancenanobiotechnologynanomedicine and nanotoxicologyACS Nanoscience Au also publishes original experimental and theoretical research of an applied nature that integrates knowledge in the areas of materials engineering physics bioscience and chemistry into important applications of nanomaterials.