研究目的
Investigating the primary stage of joint formation of silver nanowires (AgNWs) at 60 °C to establish that silver nanowires do not require the conventional high temperature post treatment process at 200 °C to form fused contacts at the intersections.
研究成果
The study proves that AgNWs heat-treated at 60 °C can form fused joints, which results in enhanced conductivity of AgNWs as top electrode for Si-tandem solar cell applications, and therefore indicates that the conventional heat treatment at 200 °C to make welded joint is no longer necessary. Observations show that the fused joints are created through thinning, a phenomenon that was not observed for AgNWs previously.
研究不足
The study focuses on AgNWs with a specific diameter and length, and the results may not be directly applicable to AgNWs with different dimensions. The MD simulation was conducted under specific conditions (pressure and temperature), which may not cover all possible real-world scenarios.
1：Experimental Design and Method Selection:
The study used rotary scanning transmission electron microscopy (STEM) with tomographic reconstruction images and super large-scale molecular dynamic (MD) simulation to investigate the joint formation of silver nanowires (AgNWs) at 60 °C.
2：Sample Selection and Data Sources:
AgNWs with aspect ratios (length to diameter) of ~6000 was tested. The AgNW diameter was 30nm, with length 150-200 μm.
3：List of Experimental Equipment and Materials:
Transmission electron microscopy (TEM) CM-200, scanning transmission electron microscopy (STEM) JEOL JEM-F200, and Virtual Nanolab (VNL) for MD simulation.
4：Experimental Procedures and Operational Workflow:
AgNWs were coated on to the substrate by drop-casting and heated at 60 °C or 200 °C. The joint formation was investigated using TEM and STEM.
5：Data Analysis Methods:
The profile of the joint was investigated using STEM and MD simulation at different temperatures.
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