OPVAP

Open Photovoltaics Analysis Platform Free for Research
 

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Notice

An error of choosing the data range of Solar Spectrum AM1.5 has been corrected. (Nov-12-12)

Function

Input

Please copy two columns Wavelength-EQE(unit %) data below


when it does not work well or ask question, please click this button.

The Result

The Current Density Jsc = mA/cm^2
Max Jsc with "100%" EQE = mA/cm^2
Donor's Lumo-Homo= eV

To know the max Jsc the absorber can reach, please see here

What is EQE? (ref: Wikipedia

Quantum efficiency (QE) is a quantity defined for a photosensitive device such as photographic film or a charge-coupled device (CCD) as the percentage of photons hitting the photoreactive surface that will produce an electron–hole pair. It is an accurate measurement of the device's electrical sensitivity to light. Since the energy of a photon depends on (more precisely, is inversely proportional to) its wavelength, QE is often measured over a range of different wavelengths to characterize a device's efficiency at each photon energy. Photographic film typically has a QE of much less than 10%, while CCDs can have a QE of well over 90% at some wavelengths.

The quantum efficiency of a solar cell is a very important measure for solar cells as it gives information on the current that a given cell will produce when illuminated by a particular wavelength. If the quantum efficiency is integrated (summed) over the whole solar electromagnetic spectrum, one can evaluate the current that a cell will produce when exposed to the solar spectrum. The ratio between this current and the highest possible current (if the QE was 100% over the whole spectrum) gives the electrical efficiency of the solar cell. With solar cells, one often measures the external quantum efficiency (EQE, sometimes also simply referred to as QE), which is the current obtained outside the device per incoming photon.

 \text{Efficiency} = \frac{\text{output}}{\text{input}}
 \text{EQE} = \frac{\text{electrons/sec}}{\text{photons/sec}}= \frac{\text{current}/\text{(charge of 1 electron)}}{(\text{total power of photons})/(\text{energy of one photon})}

The external quantum efficiency therefore depends on both the absorption of light and the collection of charges. Once a photon has been absorbed and has generated an electron-hole pair, these charges must be separated and collected at the junction. A "good" material avoids charge recombination and therefore a drop in the external quantum efficiency. EQE should not be confused with internal quantum efficiency which is the ratio of current to absorbed photons.

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