What is the Difference Between Internal and External Quantum Efficiency

The内部和外部量子效率之间的关键区别is that internal quantum efficiency is calculated using the光子that are shinning from inside of the solar cell, whereas external quantum efficiency is calculated using the photons that are shinning from outside of the solar cell.

Quantum efficiency or QE is a concept inquantum mechanics。该术语有两个主要的应用程序；它可以以光敏设备的转换电子比率概念（IPCE）和磁性隧道连接的TMR效应的形式应用于入射光子。在考虑太阳能电池的量子效率时，有两种类型的内部和外部量子效率。

1.Overview and Key Difference
2.What is Quantum Efficiency in Solar Cells
3.What is Internal Quantum Efficiency
4.What is External Quantum Efficiency
5.内部和外部量子效率表格Form
6.Summary – Internal vs External Quantum Efficiency

What is Quantum Efficiency in Solar Cells?

The Quantum efficiency of a solar cell defines the amount of current the solar cell can produce uponirradiationby photons of a particular wavelength. We can evaluate the amount of current that is produced by the solar cell when it is exposed to sunlight if the quantum efficiency of the cell is integrated over the whole solar electromagnetic spectrum. If we can get the ratio between the energy production value of the solar cell and the highest possible energy production value of the solar cell, we can get the overall energy conversion efficiency value. Moreover, we can get quantum efficiencies that are higher than 100% in multiple exciton generation. This is because the energy of an incident photon is twice higher than the bandgap energy, which leads to the creation of two or more electron-hole pairs per incident photon.

What is Internal Quantum Efficiency?

Internal quantum efficiency is the ratio between the number of charge carriers that are collected by the solar cell to the number of photons having a given energy that can shine on the solar cell from the inside (these photons are absorbed by the cell). The determination of internal quantum efficiency can be done as follows:

什么是外部量子效率？

External quantum efficiency is the ratio between the number of charge carriers that are collected by the solar cell to the number of photons having a given energy value that is shinning from outside (named as incident photons). The determination of external quantum efficiency can be done as follows:

As the above description indicates, the external quantum efficiency is always calculated using the photons that are shinning from outside the solar cell. Moreover, external quantum efficiency depends on the absorption of light.

What is the Difference Between Internal and External Quantum Efficiency?

当考虑太阳能电池的量子效率时，有两种类型的内部和外部量子效率。内部量子效率和外部量子效率之间的关键区别在于，使用从太阳能电池内部闪烁的光子计算内部量子效率，而使用从太阳能电池外面闪烁的光子计算外部量子效率。此外，内部量子效率总是比外部量子效率更高。另外，内部量子效率不取决于光的吸收，而外部量子效率取决于光的吸收。

The following infographic lists the differences between internal and external quantum efficiency in tabular form for side by side comparison.

Summary – Internal vs External Quantum Efficiency

在考虑太阳能电池的量子效率时，有两种类型的内部和外部量子效率。The key difference between internal and external quantum efficiency is that internal quantum efficiency is calculated using the photons that are shinning from the inside of the solar cell, whereas external quantum efficiency is calculated using the photons that are shinning from outside of the solar cell.