# Piezoelectricity-charge transport

• saray1360
In summary, in papers discussing the physical properties of semiconductors, the piezoelectric coefficient is calculated as the ratio between polarization and strain in a linear regime. The inverse piezoelectric effect relates the piezoelectric coefficient to the applied electric field. In computational codes, the electric potential can be calculated from mechanical stress, but this requires knowledge of the material's piezoelectric properties. The piezoelectric effect can also be used to generate electrical fields for 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?

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.

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.

## 1. What is piezoelectricity-charge transport?

Piezoelectricity-charge transport is the process by which electrical charges are generated and transported in certain materials, such as crystals and ceramics, when they are subjected to mechanical stress or pressure. This phenomenon is known as the piezoelectric effect.

## 2. How does piezoelectricity-charge transport work?

Piezoelectric materials have a unique crystal structure that allows them to convert mechanical energy into electrical energy. When an external force is applied to the material, it causes the crystal lattice to deform, which results in the separation of positive and negative charges within the material. These separated charges can then be harnessed to create an electrical current.

## 3. What are some practical applications of piezoelectricity-charge transport?

Piezoelectricity-charge transport has a wide range of practical applications, including in sensors, actuators, and energy harvesting devices. It is commonly used in electronic devices, such as microphones, ultrasound equipment, and pressure sensors. It is also being explored as a potential renewable energy source through the development of piezoelectric generators.

## 4. Can piezoelectricity-charge transport be reversed?

Yes, the piezoelectric effect is reversible, meaning that the application of an electric field to a piezoelectric material can cause it to deform or vibrate. This property is utilized in devices such as buzzers and speakers, where an electric current is used to generate sound waves.

## 5. Are there any potential drawbacks or limitations to piezoelectricity-charge transport?

One limitation of piezoelectricity-charge transport is that it is most effective in materials that have a specific crystal structure, which limits the range of materials that can exhibit this effect. Additionally, the amount of charge generated is relatively small, so it may not be suitable for high-power applications. However, ongoing research and advancements in technology are addressing these limitations and expanding the potential uses of piezoelectricity-charge transport.

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