Perovskite is a kind of material that has attracted much attention and has a wide application prospect. In the process of research and application, it is very important to understand its surface properties. 

As a commonly used tool for testing surface properties, contact angle measuring instrument plays an important role in the research and application of perovskite. 

Contact angle refers to the angle formed when the liquid is in contact with the solid surface, which can reflect the hydrophilicity or hydrophobicity of the solid surface. For perovskite materials, the contact angle directly affects its performance and application effect.

In the application of perovskite, such as solar cells, the surface properties of perovskite have an important influence on optical absorption and carrier transport. 

A larger contact angle may mean that the wettability of the liquid on the perovskite surface is poor, which may affect the stability and efficiency of the optical absorption layer. 

Specifically, if the contact angle of perovskite is large, the infiltration ability of water or other liquids on the perovskite surface will be weak, which helps to protect the perovskite layer and enhance the stability of the device. 

In some applications, a larger contact angle may be advantageous, for example, in the process of preparing perovskite films, a larger contact angle may mean that the liquid diffuses more slowly on the solid surface, which helps to form a more uniform film. 

First of all, the contact angle is related to the wettability of perovskite. 

When the contact angle is large, it shows that the liquid can not be fully expanded on the solid surface, that is, the solid surface has strong hydrophobicity. 

This may be useful for some application scenarios, such as in solar cells, a larger contact angle can reduce the contact area between photovoltaic materials and liquid electrolytes, thus reducing cell loss. 

Secondly, the contact angle is also related to the stability of perovskite. 

The results show that the larger contact angle can reduce the contact area between perovskite materials and air or water molecules, reduce their interaction with the external environment, and improve the stability and durability of perovskite materials. 

However, the larger the contact angle is not always good. 

In some application scenarios, smaller contact angle may be more beneficial to the performance and application of perovskite materials. 

For example, in photoelectric conversion devices, a small contact angle can increase the contact area between photovoltaic materials and light and improve energy conversion efficiency. 

To sum up, the perovskite contact angle measuring instrument is one of the important tools for the research and application of perovskite materials. 

The contact angle has an important influence on the properties and applications of perovskite materials, but the larger the better. 

We need to comprehensively consider the size of the contact angle according to the specific application requirements in order to achieve the best performance and application effect of perovskite materials.