Absolute spectral responsivity measurements of solar cells by a hybrid optical technique

Hamadani, Behrang H.; Roller, John; Dougherty, Brian P.; Persaud, Fiona; Yoon, Howard W.

doi:10.1364/ao.52.005184

Cited by 22 publications

(24 citation statements)

References 18 publications

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“…The reported irradiance values for each LED were obtained by integrating the spectral irradiance curves over wavelength. For QE, a dual‐light source monochromator set up was used, utilizing the principle of differential spectral response (DSR) measurement as described previously with calibrated monitor detectors from 300 nm to 1900 nm, allowing for simultaneous measurements of the cell photocurrent and the incident monochromatic beam power. The monochromator beam was chopped by a mechanical chopper, hence generating a small AC photocurrent that is collected via a transimpedance preamplifier with the ability to separate AC and DC components of the signal and built‐in voltage bias capability.…”

Section: Methodsmentioning

confidence: 99%

Spectral response measurements of multijunction solar cells with low shunt resistance and breakdown voltages

Babaro

West

Hamadani

2016

Energy Science & Engineering

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Spectral response measurements of germanium-based triple-junction solar cells were performed under a variety of light and voltage bias conditions. Two of the three junctions exhibited voltage and light bias dependent artifacts in their measured responses, complicating the true spectral response of these junctions. To obtain more insight into the observed phenomena, a set of current-voltage measurement combinations were also performed on the solar cells under identical illumination conditions, and the data were used in the context of a diode-based analytical model to calculate and predict the spectral response behavior of each junction as a function of voltage. The analysis revealed that both low shunt resistance and low breakdown voltages in two of the three junctions influenced the measured quantum efficiency of all three junctions. The data and the modeling suggest that combination of current-voltage measurements under various light bias sources can reveal important information about the spectral response behavior in multijunction solar cells.

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Section: Methodsmentioning

confidence: 99%

Spectral response measurements of multijunction solar cells with low shunt resistance and breakdown voltages

Babaro

West

Hamadani

2016

Energy Science & Engineering

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“…We now describe the model calibration algorithm and identified fitting issues in more detail. We present the algorithm for the seven-parameter SDM-G in equations (12)(13)(14)(15)(16)(17), noting that a slightly simpler algorithm for the five-parameter SDM-L in equation (1) was also developed for I-V curves taken at (or corrected to) a single temperature and irradiance.…”

Section: Model Calibration Algorithmmentioning

confidence: 99%

Calibration of a single‐diode performance model without a short‐circuit temperature coefficient

Campanelli¹,

Hamadani

2018

Energy Science & Engineering

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We calibrate the seven parameters of a single-diode model (SDM) for photovoltaic device performance using current-voltage (I-V) curves measured under controlled laboratory conditions over a matrix of nominal temperature and irradiance combinations. As described in previous modeling work, we do not use a short-circuit temperature coefficient parameter, which depends on the often unknown insolation spectrum and whose validity may be questionable. Alternatively, we employ a rigorous temperature-dependent extension of the spectral mismatch correction. This standard correction is routinely used by calibration laboratories to measure an effective irradiance ratio (i.e., a particular ratio of short-circuit currents) using a calibrated reference device, thereby compensating for spectral effects of the irradiance and for any difference in spectral response between the test device and reference device. The calibrated SDM predicts the device's current at any prescribed voltage, temperature, and effective irradiance, and thus can predicts power and energy production under prescribed conditions. Our approach aligns well with the matched reference cell approach to outdoor I-V curve measurements, while clarifying the requirements of a "matched" condition for the irradiance monitoring device(s). We find evidence for significant model discrepancy in the SDM, suggesting that model improvements and measurement intercomparisons are needed. 223

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“…The duty cycle was set at 50 %. Pulsed excitation measurements provide far greater stability of the LED signal than steady DC operation [13,14] and better signal to noise detection with the lock-in method. Additionally, the LEDs were mounted on water-cooled plates with water temperature of 15 °C to provide a stable output intensity and spectrum.…”

Section: System Descriptionmentioning

confidence: 99%

Non-linearity measurements of solar cells with an LED-based combinatorial flux addition method

et al. 2016

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We present a light emitting diode (LED)-based system utilizing a combinatorial flux addition method to investigate the nonlinear relationship in solar cells between the output current of the cell and the incident irradiance level. The magnitude of the light flux is controlled by the supplied currents to two LEDs (or two sets of them) in a combinatorial fashion. The signals measured from the cell are arranged within a related overdetermined linear system of equations derived from an appropriately chosen Nth degree polynomial representing the relationship between the measured signals and the incident fluxes. The flux values and the polynomial coefficients are then solved for by linear least squares to obtain the best fit. The technique can be applied to any solar cell, under either monochromatic or broadband spectrum. For the unscaled solution, no reference detectors or prior calibrations of the light flux are required. However, if at least one calibrated irradiance value is known, then the entire curve can be scaled to an appropriate spectral responsivity value. Using this technique, a large number of data points can be obtained in a relatively short time scale over a large signal range.

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Absolute spectral responsivity measurements of solar cells by a hybrid optical technique

Cited by 22 publications

References 18 publications

Spectral response measurements of multijunction solar cells with low shunt resistance and breakdown voltages

Spectral response measurements of multijunction solar cells with low shunt resistance and breakdown voltages

Calibration of a single‐diode performance model without a short‐circuit temperature coefficient

Non-linearity measurements of solar cells with an LED-based combinatorial flux addition method

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