Optoelectronic characterization

Current and Power

^Photocurrent

Then the photocurrent $I_{\text{photo}}$ is calculated as the summation of the integration of these “radiative” and “fixed”:

(2.2.44)$$I_{\text{photo}}=e\cdot (\int d\mathbf{x}{R}_{\text{rad,net}}^{stim}(\mathbf{x})+\int d\mathbf{x}{R}_{\text{fixed}}(\mathbf{x}))$$

Power

(2.2.45)$$\sum _i{V}_{\text{i-th contact}}\cdot I_{\text{i-th contact}}$$

Absorbed-power

(2.2.46)$$\int dEd\mathbf{x}E\cdot G(E,\mathbf{x})$$

where $G(E,x)$ is the generation rate calculated.

Emitted-power

(2.2.47)$$\int dEdxE\cdot R_{\text{rad}}^{spon}(E,x)$$

Efficiencies

IQE - internal quantum efficiency

is calculated as

(2.2.48)$${\eta }_{IQE}=\frac{I_{\text{photo}}}{I_{\text{total}}}$$

where $I_{\text{total}}$ is the total injected current consisted of both electron and hole currents.

The electrical power and optical power are calculated and output in power.dat:

RQE - volume quantum efficiency

, which is also called as radiative quantum efficiency, is calculated as

(2.2.49)$${\eta }_{VQE}=\frac{R_{\text{rad,net}}^{stim}+R_{\text{fixed}}}{R_{\text{total}}}$$

where $R_{\text{total}}=R_{\text{rad,net}}^{stim}+R_{\text{fixed}}+R_{\text{Auger}}+R_{\text{SRH}}$ is the total recombination rate including both radiative and non-radiative recombination.

Both ${\eta }_{IQE}$ and ${\eta }_{VQE}$ agree if the electrons and holes injected into the active region are fully consumed up by the recombination there. However, if they are not consumed up, $e\cdot R_{\text{total}}<I_{\text{charge}}$ and this results in ${\eta }_{\text{IQE1}}>{\eta }_{\text{IQE2}}$

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Last update: 09/12/2024