2.15. Optoelectronic characterization

2.15.1. Current and Power

^Photocurrent

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

(2.15.1.1)\[I_\text{photo} =e\cdot\bigg( \int d\mathbf{x}\ R^{stim}_\text{rad,net}(\mathbf{x}) + \int d\mathbf{x}\ R_\text{fixed}(\mathbf{x}) \bigg)\]

Power

(2.15.1.2)\[\sum_{i}V_\text{i-th contact}\cdot I_\text{i-th contact}\]

Absorbed-power

(2.15.1.3)\[\int dEd\mathbf{x}\ E\cdot G(E,\mathbf{x})\]

where \(G(E,x)\) is the generation rate calculated according to the configuration in classical{ }.

Emitted-power

(2.15.1.4)\[\int dEdx\ E\cdot R^{spon}_\text{rad}(E,x)\]

2.15.2. Efficiencies

IQE - internal quantum efficiency

is calculated as

(2.15.2.1)\[\eta_{IQE} = \frac{I_\text{photo}}{I_\text{total}}\]

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

(2.15.2.2)\[\eta_{VQE} = \frac{R^{stim}_\text{rad,net} + R_\text{fixed}}{R_\text{total}}\]

where \(R_\text{total}=R^{stim}_\text{rad,net} + R_\text{fixed} + R_\text{Auger} + R_\text{SRH}\) 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 \(\eta_\text{IQE1}>\eta_\text{IQE2}\)

Last update: 09/12/2024