Input photon conversion efficiency

To define the efficiency of solar cells, the following main parameters are used. First, the external quantum efficiency (also called the input photon conversion efficiency tjipce) is defined as the number of generated electrons per incident photon. For a given wavelength X (nm), it is expressed by... [Pg.263]

Conversion efficiency, photon energy absorbed/input energy to laser system, 1/1000... [Pg.931]

Artificial radiant sources are characterized by their power density (i.e. the input power per unit length in W cm ), the efficiency of conversion of electrical energy into photon energy (radiant power efficiency r =i) in a defined wavelength... [Pg.83]

The quantities Pn and p i are properties of the material and are temperature dependent. For c-Si typical values for ph and p are 500 cm s" in n-type Si and 1200 in cm s in p-type Si, respectively.i i The efficiency of the device is the ratio of power output to input power. The thermodynamic limit to solar energy conversion is 93%. The loss processes in a simple p-n junction solar cell are shown in Figure 3.4. Photons with energy lower than the band gap do not have sufficient energy to promote an electron to the conduction band and therefore do not contribute to the power output. Process 1 occurs when a photon with... [Pg.104]

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