Piezoelectricity-charge transport

[saray1360]

Hi,

In papers discussing the physical properties of semiconductors, I have found that they have calculated the piezoelectric coefficient as the ratio between the polarization and the strain in a linear regime (which produces e):

a) I think in experiment we first insert an electric field then we calculate the piezoelectric coefficient (d). Therefore, I would like to know how we can first insert an electric field and then calculate the piezoelectric constant theoretically. (I mean how can we have d and e together?) Or how can we have e and then we calculate the electric field consequently.

b) In some codes we can calculate the charge transport and as I know they give I-V curves. I wanted to know if it is possible to have the electric potential (the voltage) if we put mechanical stress on the system we are calculating in such computational codes? is there a relation between the charge transport and piezoelectricity in atomic scales and in theoretical point of view?

 

[BigJDubs]

Thanks for your help. For a), there is a relation between the piezoelectric coefficient and the electric field. This relation is known as the inverse piezoelectric effect and is described by the equation:d = e/E, where d is the piezoelectric coefficient, e is the strain in the material, and E is the applied electric field.For b), it is possible to calculate the electric potential from mechanical stress in computational codes. However, this requires knowledge of the material's piezoelectric properties. The charge transport and piezoelectricity are related in that the piezoelectric effect can be used to generate electrical fields which can then be used to drive charge transport.

 

[charng]

Thank you for your question about piezoelectricity and charge transport. Piezoelectricity is the ability of certain materials to generate an electric charge when subjected to mechanical stress, and it is an important property in many applications such as sensors, actuators, and energy harvesting devices. The piezoelectric coefficient is a measure of this effect and is typically calculated by measuring the polarization and strain in a linear regime.

In response to your first question, the process of applying an electric field and then calculating the piezoelectric coefficient theoretically is known as the direct piezoelectric effect. This can be done by using equations that relate the polarization, strain, and electric field, such as the constitutive equations for piezoelectric materials. Alternatively, the reverse piezoelectric effect involves applying a mechanical stress and measuring the resulting electric field. In either case, the piezoelectric coefficient can be determined experimentally or theoretically.

Regarding your second question, there is a relationship between charge transport and piezoelectricity in atomic scales. In fact, the piezoelectric effect is often utilized to control the charge transport in devices such as transistors and diodes. In theoretical studies, the piezoelectric coefficient can be incorporated into models of charge transport to account for its influence on the system. However, it is important to note that the piezoelectric effect is typically only significant at the nanoscale and may not have a significant impact on charge transport at larger scales.

I hope this helps to clarify the relationship between piezoelectricity and charge transport. it is important to understand the fundamental properties of materials and how they can be manipulated for various applications. Further research and experimentation in this area can lead to advancements in technology and understanding of these phenomena.