sttan said:I'm wondering why the amorphous phase materials have wider bandgap compared to its crystalline phase. To my best knowledge, the bonding mechanism does not changed as the material transform from crystalline phase to amorphous phase. So what causes it has larger bandgap?
ST
sttan said:I'm wondering why the amorphous phase materials have wider bandgap compared to its crystalline phase. To my best knowledge, the bonding mechanism does not changed as the material transform from crystalline phase to amorphous phase. So what causes it has larger bandgap?
ST
The lack of long-range order in amorphous materials leads to a higher degree of disorder and higher energy levels, resulting in a wider bandgap. In contrast, crystalline materials have a regular, repeating atomic structure, leading to a narrower bandgap.
The wider bandgap of amorphous materials makes them less conductive and more insulating compared to crystalline materials with a narrower bandgap. This can affect their optical, electrical, and mechanical properties.
Yes, the bandgap of amorphous materials can be controlled by adjusting the composition, processing conditions, and doping of the material. This can be advantageous for specific applications that require a certain bandgap.
Defects and impurities in amorphous materials can introduce additional energy levels within the bandgap, which can affect the bandgap width. The type and concentration of defects can also influence the bandgap of amorphous materials.
Yes, the wider bandgap of amorphous materials can make them more resistant to degradation from external factors, such as UV radiation and high temperatures. They also have a broader range of applications, including in semiconductors, solar cells, and optical coatings.