Details
| Original language | English |
|---|---|
| Article number | 125008 |
| Number of pages | 6 |
| Journal | Measurement science and technology |
| Volume | 30 |
| Issue number | 12 |
| Publication status | Published - 17 Sept 2019 |
Abstract
The spectral responsivity SλSTC(λ) of solar cells is widely used for cell analysis or calibration purposes. According to the IEC60904-8:2014 standard, the reference method for the determination of SλSTC(λ) is the complete differential spectral responsivity approach. For this approach, the differential spectral responsivity S&tild;(λ) is measured as a function of wavelength and bias irradiance. To obtain the spectral responsivity SλSTC(λ) related to standard test conditions the IEC60904-8:2014 standard recommends to integrate 1/S&tild;(λ) via bias current Ib for each wavelength. We show that this integration is wrong. It lacks analytical derivation and provides faulty curves for non-linear solar cells. We prove analytically and by means of simulations that the correct way of calculation is either the integration of S&tild;(λ) via the bias irradiance Eb or the integration of S&tild;(λ)/S&tild;AMx via the bias current Ib, with S&tild;AMx being the AMx-weighted (e.g. AM1.5G or AM1.5D) differential responsivity. A simulation of the differential spectral responsivity of a strongly non-linear solar cell demonstrates deviations of SλSTC(λ) up to 30% for (the wrong) integration of 1/S&tild;(λ) via Ib at some wavelengths, corresponding to a deviation in the short-circuit current of up to 3.0%.
Keywords
- differential spectral responsivity, photovoltaics, solar cell calibration, solar cell characterization, solar cells, spectral responsivity
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Instrumentation
- Engineering(all)
- Engineering (miscellaneous)
- Mathematics(all)
- Applied Mathematics
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In: Measurement science and technology, Vol. 30, No. 12, 125008, 17.09.2019.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Determining the spectral responsivity of solar cells under standard test conditions
AU - Hinken, D.
AU - Kröger, I.
AU - Winter, Stephan
AU - Brendel, Rolf
AU - Bothe, K.
N1 - Acknowledgment: This work was part of the PV-Enerate project and has received funding from the EMPIR programme co-financed by the Participating States and from the European Union’s Horizon 2020 research and innovation programme.
PY - 2019/9/17
Y1 - 2019/9/17
N2 - The spectral responsivity SλSTC(λ) of solar cells is widely used for cell analysis or calibration purposes. According to the IEC60904-8:2014 standard, the reference method for the determination of SλSTC(λ) is the complete differential spectral responsivity approach. For this approach, the differential spectral responsivity S&tild;(λ) is measured as a function of wavelength and bias irradiance. To obtain the spectral responsivity SλSTC(λ) related to standard test conditions the IEC60904-8:2014 standard recommends to integrate 1/S&tild;(λ) via bias current Ib for each wavelength. We show that this integration is wrong. It lacks analytical derivation and provides faulty curves for non-linear solar cells. We prove analytically and by means of simulations that the correct way of calculation is either the integration of S&tild;(λ) via the bias irradiance Eb or the integration of S&tild;(λ)/S&tild;AMx via the bias current Ib, with S&tild;AMx being the AMx-weighted (e.g. AM1.5G or AM1.5D) differential responsivity. A simulation of the differential spectral responsivity of a strongly non-linear solar cell demonstrates deviations of SλSTC(λ) up to 30% for (the wrong) integration of 1/S&tild;(λ) via Ib at some wavelengths, corresponding to a deviation in the short-circuit current of up to 3.0%.
AB - The spectral responsivity SλSTC(λ) of solar cells is widely used for cell analysis or calibration purposes. According to the IEC60904-8:2014 standard, the reference method for the determination of SλSTC(λ) is the complete differential spectral responsivity approach. For this approach, the differential spectral responsivity S&tild;(λ) is measured as a function of wavelength and bias irradiance. To obtain the spectral responsivity SλSTC(λ) related to standard test conditions the IEC60904-8:2014 standard recommends to integrate 1/S&tild;(λ) via bias current Ib for each wavelength. We show that this integration is wrong. It lacks analytical derivation and provides faulty curves for non-linear solar cells. We prove analytically and by means of simulations that the correct way of calculation is either the integration of S&tild;(λ) via the bias irradiance Eb or the integration of S&tild;(λ)/S&tild;AMx via the bias current Ib, with S&tild;AMx being the AMx-weighted (e.g. AM1.5G or AM1.5D) differential responsivity. A simulation of the differential spectral responsivity of a strongly non-linear solar cell demonstrates deviations of SλSTC(λ) up to 30% for (the wrong) integration of 1/S&tild;(λ) via Ib at some wavelengths, corresponding to a deviation in the short-circuit current of up to 3.0%.
KW - differential spectral responsivity
KW - photovoltaics
KW - solar cell calibration
KW - solar cell characterization
KW - solar cells
KW - spectral responsivity
UR - http://www.scopus.com/inward/record.url?scp=85075748728&partnerID=8YFLogxK
U2 - 10.1088/1361-6501/ab34ef
DO - 10.1088/1361-6501/ab34ef
M3 - Article
AN - SCOPUS:85075748728
VL - 30
JO - Measurement science and technology
JF - Measurement science and technology
SN - 0957-0233
IS - 12
M1 - 125008
ER -