The photoelectric conversion efficiency, that is, the monochromatic incident photon-to-electron conversion efficiency (indicated by the abbreviation IPCE), is defined as the number Ne of electrons generated in an external circuit per unit time and the number of incident monochromatic photons per unit time Np. ratio.
Formula for photoelectric conversion efficiencyConsidering the process of current generation, IPCE is related to the light harvesting efficiency LHE(l), the electron injection quantum efficiency finj and the collection efficiency fc of the injected electrons on the back contact of the nanocrystalline film and the conductive glass. . See formula:
IPCE(l)=LHE(l)'finj'fc=LHE(l)'f(l)
Where finj'fc can be regarded as the quantum efficiency f(l). Since 0£LHE(l)£1, for the same system, IPCE(l)£f(l). Compared with the two, IPCE(l) can better represent the degree of solar energy utilization of the battery, because f(l) only considers the photoelectric conversion of the absorbed light, while IPCE(l) considers the photoelectrically absorbed light. The conversion takes into account the extent of light absorption. For example, if the light capture efficiency of an electrode is 1%, and the experimentally measured quantum efficiency f(l) is 90%, its IPCE(l) is only 0.9%. As a solar cell, all the incident light must be considered, so IPCE(l) indicates that its photoelectric conversion efficiency is more reasonable; as a LB film or self-assembled film sensitized plate electrode, the research is mainly used to screen dyes and not pay attention to light trapping. Efficiency, so commonly used f (l) represents the photoelectric conversion effect. In dye-sensitized solar cells, the relationship between IPCE(l) and the wavelength of incident light is the photocurrent working spectrum.
Light intensity - based on AM1.5, ie 1000W/m2
Dark current ratio - Irev" 6 battery proportion
Inefficient tablet ratio - P156Eff "14.5% of the proportion of cells
Solar cell power calculation formula
The cell manufacturer will give the solar cell performance parameters under standard test conditions in the product specification sheet: generally including short-circuit current Isc; open circuit voltage Voc; maximum power point voltage Vap; maximum power point current Iap; maximum power Pmpp; conversion Efficiency Eff and so on. Under the standard test conditions, the maximum power Pmpp has the following relationship with the conversion efficiency:
Pmpp=Battery Area (m2)*1000(W/m2)*Eff is as follows:
Product type conversion efficiency (%) power (W)
Single crystal 125*125152.22855
Single crystal 156*156153.58425
Polycrystalline 125*125152.34375
Polycrystalline 156*156153.6504
Note 1: The test conditions are in accordance with the AM1.5 solar spectrum with an irradiation intensity of 1000 W/m2 and a battery temperature of 25 °C. The test method complies with IEC904-1 and the tolerance is ±5% REL.
Complies with IEC904-1, tolerance Efficiency ± 5% REL.
Note 2: AM1.5
AM is short for airmass, meaning air quality.
AM1.5 is a condition that describes the average illuminance of sunlight incident on the earth's surface with a total solar irradiance of 1000 W/m2 and a solar cell calibration temperature of 25 ± 1 °C.
Note 3: IEC904-1
IEC: International Electrotechnical Commission, international electrotechnical commission.
IEC904 is equivalent to GB/T6495.
Note 4: REL: rateofenergyloss energy loss rate
Photoelectric conversion efficiency (IPCE) current generation processThe PCE is related to the light harvesting efficiency LHE(l), the electron injection quantum efficiency finj, and the collection efficiency fc of the injected electrons on the back contact of the nanocrystalline film and the conductive glass. See formula:
IPCE(l)=LHE(l)*finj*fc=LHE(l)*f(l)
Where finj'fc can be regarded as the quantum efficiency f(l). Since 0£LHE(l)£1, for the same system, IPCE(l)£f(l). Compared with the two, IPCE(l) can better represent the degree of solar energy utilization of the battery, because f(l) only considers the photoelectric conversion of the absorbed light, while IPCE(l) considers the photoelectrically absorbed light. The conversion takes into account the extent of light absorption. For example, if the light capture efficiency of an electrode is 1%, and the experimentally measured quantum efficiency f(l) is 90%, its IPCE(l) is only 0.9%. As a solar cell, all the incident light must be considered, so IPCE(l) indicates that its photoelectric conversion efficiency is more reasonable; as a LB film or self-assembled film sensitized plate electrode, the research is mainly used to screen dyes and not pay attention to light trapping. Efficiency, so commonly used f (l) represents the photoelectric conversion effect. In dye-sensitized solar cells, the relationship between IPCE(l) and the wavelength of incident light is the photocurrent working spectrum.
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