Development of a multi-source solar simulator for spatial uniformity and close spectral matching to AM0 and AM1.5

Polly, Stephen J.; Bittner, Zachary S.; Bennett, Mitchell F.; Raffaelle, Ryne P.; Hubbard, Seth M.

doi:10.1109/pvsc.2011.6186290

Cited by 12 publications

(6 citation statements)

References 3 publications

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“…The system was calibrated using InGaP 2 (E g = 1.85 eV) and GaAs (E g = 1.42 eV) cells calibrated by the National Renewable Energy Laboratory. The spectral match between RIT AM1.5G/AM0 and ASTM AM1.5G/AM0 is nearly unity from 350 to 1200 nm with exception of out of range points between 600-700 nm [22]. During the measurement, the samples were placed on a temperature-controlled chuck set at 25 °C.…”

Section: Device Structures and Experimental Detailsmentioning

confidence: 99%

Impact of Well Number on High-Efficiency Strain-Balanced Quantum-Well Solar Cells

Welser

Polly

Bogner

et al. 2023

IEEE J. Photovoltaics

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The addition of lower energy-gap InGaAs quantum wells to the depletion region of GaAs solar cells is an established approach to enhance photovoltaic performance by extending infrared collection. However, maintaining a high open-circuit voltage (V oc ) when including quantum wells has proven more challenging. In this article, we report on high-efficiency (η > 23.5% AM0) strainbalanced quantum well (SBQW) solar cells with increased current output and efficiency while maintaining the same high open-circuit voltage of baseline devices without quantum wells (V oc > 1.02 V). The single-junction GaAs-based device structures discussed herein employ a radiation-tolerant, n-i-p front-junction architecture and include both an InGaP heterojunction (HJ) emitter and in most cases an underlying AlGaAs distributed Bragg reflector.The impact of well number on photovoltaic device characteristics is described using an analytical model that assumes current collection, radiative recombination, and nonradiative recombination all increase with well number and are additive to the baseline cell. The highest V oc and efficiency SBQW devices employ shallow 9.2 nm In 0.07 Ga 0.93 As quantum wells and 11.5 nm GaAs 0.90 P 0.10 barrier layers to maintain strain balancing. Increasing the indium composition in the wells from 7% to 10% to form deeper wells requires a thicker strain-balancing barrier layer and results in an apparent increase in radiative recombination and decreased V oc . Single-junction high-efficiency SBQW device performance is also demonstrated in thinner base-layer structures with graded HJs-device structures suitable for inclusion in radiation-tolerant multi-junction structures.

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Section: Device Structures and Experimental Detailsmentioning

confidence: 99%

Impact of Well Number on High-Efficiency Strain-Balanced Quantum-Well Solar Cells

Welser

Polly

Bogner

et al. 2023

IEEE J. Photovoltaics

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“…The test sample was directly placed inside the quartz box so the solutions could contact photocatalysts on the surface of the mortars. The quartz box was irradiated by a 500 W xenon lamp (Beijing China Education Au-light Co., Ltd., China) with an AM1.5 solar simulation filter (Polly et al 2011;Yongqiang et al 2012). Xenon lamp has black body radiation and the color temperature of xenon lamps is up to 6000 K, which is very similar to the real sun so the xenon lamp was selected to simulate the light source in this study (Miyake and Kawamura 1987).…”

Section: Experiments On Photocatalytic Performances Of Degrading Orga...mentioning

confidence: 99%

Photocatalytic concrete for degrading organic dyes in water

Zhou

Elchalakani

Liu

et al. 2022

Environ Sci Pollut Res

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Since the advent of photocatalytic degradation technology, it has brought new vitality to the environmental governance and the response to the energy crisis. Photocatalysts harvest optical energy to drive chemical reactions, which means people can use solar energy to complete some resource-consuming activities by photocatalysts, such as environmental governance. In recent years, researchers have tried to combine photocatalyst TiO 2 with building materials to purify urban air and obtained good results. One of the important functions of photocatalysts is to degrade organic pollutants in water through light energy, but this technology has not been reported in the practical application areas. To extend this technology to practical application areas, photocatalytic concrete for degrading pollutants in waters was proposed and demonstrated for the first time in this paper. The photocatalytic concrete proposed based on the K-g-C 3 N 4 shows a strong ability to degrade the organic dyes. According to the experiment results, the angle of light source plays an important role in the process of photocatalytic degradation, while waters with pH value of 6.5-8.5 hardly influenced the degradation of organic dyes. When the angle of light source is advantageous for photocatalytic concrete to absorb more visible light, more organic dyes will be degraded by photocatalytic concrete. The degradation rate of methylene blue could reach about 80% in ½ hour under desirable conditions and is satisfied compared with that of reported works. This study implicates that photocatalytic concrete can effectively degrade organic dyes in water. The influences of changes in the water environment hardly affect the degradation of organic pollutants, which means photocatalytic concrete can be widely used in green infrastructures to achieve urban sewage treatment.

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“…As a recognized alternative to traditional energy sources and grid parity, photovoltaic (PV) technology has demonstrated strong economic competitiveness in numerous emerging real-time energy demand systems. [1][2][3][4] Although current state-of-the-art single-junction solar cells dominate the PV market, their theoretical efficiencies are limited to 29-33% due to the detailed balance principle or Shockley-Queisser (S-Q) limit. 5 To overcome these efficiency limitations, multijunction solar cells (MJSCs) that aid the optimal utilization of the broad solar spectrum have attracted enormous attention over the past two decades.…”

Section: Introductionmentioning

confidence: 99%

“…As a recognized alternative to traditional energy sources and grid parity, photovoltaic (PV) technology has demonstrated strong economic competitiveness in numerous emerging real‐time energy demand systems 1–4 . Although current state‐of‐the‐art single‐junction solar cells dominate the PV market, their theoretical efficiencies are limited to 29–33% due to the detailed balance principle or Shockley–Queisser (S‐Q) limit 5 .…”

Section: Introductionmentioning

confidence: 99%

Defect‐induced current coupling in multi‐junction solar cells revealed by absolute electroluminescence imaging

Wang

Jia

et al. 2022

Progress in Photovoltaics

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An electroluminescence (EL) anomaly singular spot was observed in an industrystandard InGaP/GaAs multi-junction solar cell (MJSC). Affected by this singular spot, the spatially resolved subcell current distributions were found to exhibit unique opposite characteristics, which we call "defect-induced current coupling." Herein, we conducted systematic investigations to reveal the defect-induced current coupling phenomenon, for the first time, through the absolute EL imaging technique. Specifically, a modified carrier-balance model was first proposed to describe the subcell optoelectronic distribution around the singular spot. Then, optical and electrical properties including subcell non-radiative recombination distributions, J-V characteristics, essential photovoltaic parameters, and energy losses were quantitatively extracted for characterizing the performance inhomogeneity caused by the defect-induced coupling. Moreover, a three-dimensional distributed circuit model was established to numerically simulate the absolute EL emissions and extract local electrical parameters around the singular spot. Simulation results revealed that the defect-induced current coupling phenomenon is attributed to the deterioration of weak-diode and shunt parameters at the GaAs bottom cell, and the efficiency of the MJSC was estimated to be reduced by 0.408% compared with the defect-free MJSC model.

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Development of a multi-source solar simulator for spatial uniformity and close spectral matching to AM0 and AM1.5

Abstract: Results from ongoing development of spatial and spectral quality of RIT's dual source solar simulator are presented. This simulator as designed qualifies as class A for both AM0 and AM1.5, depending on the filter set used.

Cited by 12 publications

References 3 publications

Impact of Well Number on High-Efficiency Strain-Balanced Quantum-Well Solar Cells

Impact of Well Number on High-Efficiency Strain-Balanced Quantum-Well Solar Cells

Photocatalytic concrete for degrading organic dyes in water

Defect‐induced current coupling in multi‐junction solar cells revealed by absolute electroluminescence imaging

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