Photoluminescence-Based Current–Voltage Characterization of Individual Subcells in Multijunction Devices

Alonso‐Álvarez, Diego; Ekins-Daukes, N. J.

doi:10.1109/jphotov.2016.2547583

Cited by 18 publications

(9 citation statements)

References 23 publications

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“…To estimate the pseudo-J-V curves of the subcells, we performed absolute electroluminescence (EL) imaging, where the excess charge carriers are generated electrically to access the subcell characteristics (65)(66)(67)(68). For each injected current, an EL image was recorded, from which the voltage of the subcells can be calculated from an average over the active area (Figure S36).…”

Section: Subcell J-v Characteristics Of a Monolithic Tandem Solar Cellmentioning

confidence: 99%

Monolithic perovskite/silicon tandem solar cell with >29% efficiency by enhanced hole extraction

Al‐Ashouri

Köhnen

et al. 2020

Science

1,335

1,442

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Tandem solar cells that pair silicon with a metal halide perovskite are a promising option for surpassing the single-cell efficiency limit. We report a monolithic perovskite/silicon tandem with a certified power conversion efficiency of 29.15%. The perovskite absorber, with a bandgap of 1.68 electron volts, remained phase-stable under illumination through a combination of fast hole extraction and minimized nonradiative recombination at the hole-selective interface. These features were made possible by a self-assembled, methyl-substituted carbazole monolayer as the hole-selective layer in the perovskite cell. The accelerated hole extraction was linked to a low ideality factor of 1.26 and single-junction fill factors of up to 84%, while enabling a tandem open-circuit voltage of as high as 1.92 volts. In air, without encapsulation, a tandem retained 95% of its initial efficiency after 300 hours of operation.

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Section: Subcell J-v Characteristics Of a Monolithic Tandem Solar Cellmentioning

confidence: 99%

Monolithic perovskite/silicon tandem solar cell with >29% efficiency by enhanced hole extraction

Al‐Ashouri

Köhnen

et al. 2020

Science

1,335

1,442

View full text Add to dashboard Cite

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“…In the experiment, these voltages are obtained from the luminescence measurements, as discussed in Ref. [12].…”

Section: Calculation Of the Currents And Voltagesmentioning

confidence: 99%

“…In a previous work, we used photoluminescence spectroscopy as a contactless, fast method to evaluate the current-voltage (IV) characteristics of each junction in MJ devices, estimating the solar cell characteristics such as open circuit voltage (V oc ) or fill factor (FF) [12]. Such contactless technique allows for a fast screening of devices in the industry environment as well as tool for early diagnosis of the quality of the epitaxial process, given that a full device structure is not necessary.…”

Section: Introductionmentioning

confidence: 99%

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SPICE Modelling of Photoluminescence and Electroluminescence Based Current-Voltage Curves of Solar Cells for Concentration Applications

Alonso-Álvarez

Ekins-Daukes

2016

JGE

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Abstract.Quantitative photoluminescence (PL) or electroluminescence (EL) experiments can be used to probe fast and in a non-destructive way the current-voltage (IV) characteristics of individual subcells in a multi-junction device, information that is, otherwise, not available. PL-based IV has the advantage that it is contactless and can be performed even in partly finished devices, allowing for an early diagnosis of the expected performance of the solar cells in the production environment. In this work we simulate the PL-and EL-based IV curves of single junction solar cells to assess their validity compared with the true IV curve and identify injection regimes where artefacts might appear due to the limited in-plane carrier transport in the solar cell layers. We model the whole photovoltaic device as a network of sub-circuits, each of them describing the solar cell behaviour using the two diode model. The sub-circuits are connected to the neighbouring ones with a resistor, representing the in-plane transport in the cell. The resulting circuit, involving several thousand subcircuits, is solved using SPICE.

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“…Characterization for low-power solar cells is found extensively both in literature [13][14][15][16] with several low-power single cell/module characterization devices available in industry. The focus of the above-mentioned cell-level characterization is typically in the early design and performance validation stages of the PV device development [17,18]. However, high-power PV array characterization in the range of kilo Watts is not as widely available due to challenges posed by thermal losses in electronic components [19].…”

Section: Introductionmentioning

confidence: 99%

High-Power Closed-Loop SMPC-Based Photovoltaic System Characterization under Varying Ambient Conditions

Bharadwaj

2021

Energies

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Photovoltaic energy generation potential can be tapped with maximum efficacy by characterizing the source behaviour. Characterization refers to the systematic terminal measurement-based PV modeling which can further facilitate output prediction and fault detection. Most of the existing PV characterization methods fail for high-power PV array due to increased thermal losses in electronic components. Here, we propose a switched-mode power converter-based PV characterization setup which is designed with input filter to limit switching ripple entering into PV array under test, thereby enhancing system life and efficiency. The high resonant frequency input filter ensures its compactness with high-speed characterization capability. To further enhance the system performance, a closed-loop current control of the system is designed for high bandwidth and stable phase margins. Variation of the controller parameters under varying ambient conditions of 200–1000 W/m2 irradiation and 25–70 °C temperature is documented and an adaptive PI controller is proposed. Experimental and simulation results validate the high performance of the closed loop operation of the PV characterization at 1.2 kW range power level in real-time field conditions. Compared to the open loop operation, the closed-loop operation eliminates the waveform ringing by 100% during characterization.

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Photoluminescence-Based Current–Voltage Characterization of Individual Subcells in Multijunction Devices

Cited by 18 publications

References 23 publications

Monolithic perovskite/silicon tandem solar cell with >29% efficiency by enhanced hole extraction

Monolithic perovskite/silicon tandem solar cell with >29% efficiency by enhanced hole extraction

SPICE Modelling of Photoluminescence and Electroluminescence Based Current-Voltage Curves of Solar Cells for Concentration Applications

High-Power Closed-Loop SMPC-Based Photovoltaic System Characterization under Varying Ambient Conditions

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