A5027442474- solar cell performance optimization
- Thin-Film Transistor Technologies
- Chalcogenide Semiconductor Thin Films
- Thermal Radiation and Cooling Technologies
- Perovskite Materials and Applications
- Semiconductor Quantum Structures and Devices
- Solar Thermal and Photovoltaic Systems
- Photovoltaic System Optimization Techniques
- Advancements in Semiconductor Devices and Circuit Design
- Laser Material Processing Techniques
- Reliability and Maintenance Optimization
- Nanowire Synthesis and Applications
- Silicon and Solar Cell Technologies
- GaN-based semiconductor devices and materials
- Risk and Safety Analysis
- Photonic and Optical Devices
- Advancements in Solid Oxide Fuel Cells
- Thermal Expansion and Ionic Conductivity
National Renewable Energy Laboratory
2024-2025
Arizona State University
2019-2023
University of Ottawa
2022
Abstract Field testing, failure analysis, and understanding of degradation mechanisms are essential to advancing metal halide perovskite (MHP) photovoltaic (PV) technology toward commercialization. Here, we present performance data from up 1 year outdoor testing MHP modules in Golden, Colorado. The module encapsulation architecture encapsulant materials have a significant impact on reliability, with containing polyolefin elastomer (POE) addition desiccated polyisobutylene (PIB) edge seal...
Reflection of sub-bandgap light has been argued to be the most effective path lower temperature solar modules. This report compares GaAs modules with high reflection various Si under two experimental thermal configurations. At one sun, operate ∼6 °C colder than both multicrystalline and monocrystalline within an open-rack configuration. advantage increases ∼13 for thermally insulated The data are used build a theoretical model, finding agreement root-mean-square error between 1.4°C–2.8 °C....
This article explores the use of femtosecond (fs) lasers to form glass-to-glass welds for hermetically sealed, polymer-free solar modules. Low-iron glass coupons were welded together without filler using a fs laser with dedicated optics elongate focal plane parallel incident beam. The resulting then stress tested failure reveal critical intensity factor, <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">K<sub>Ic</sub></i> . These values used in...
Though power conversion is an important metric for photovoltaic windows, it must be balanced with visible transmittance, aesthetics (color and haze), thermal performance. Optical properties are often reported, but performance typically neglected entirely in window design. Here, we introduce the strategy of using laminate layers to improve thermo-optical perovskite-based insulating glass units. We design laminates units by coupling a transfer matrix method optical model 1D heat model....
Dilute nitride materials grown on Si offer a pathway for inexpensive, lattice matched multijunction solar cells. A comparison in device performance between two-terminal and three-terminal tandem cells with dilute top cell bottom was done by detailed-balance modelling. The hetero-integration of nitrides is an important part realizing such structure. Towards this end, first key step to optimize the growth GaP Si. In work, surface epitaxially wafers various orientations studied using atomic...
The strong dependence that open-circuit voltage has on photon recycling may be the key to push photovoltaic cells closer their Shockley-Queisser efficiency limit. Photon can improved by use of a highly reflective mirror at back-surface. Therefore, it is important maximize area while maintaining sufficient conductivity for carrier collection. In this work, limit calculations are used model rear surface reflector effects cell performance varying reflectance and reflector. lateral contact...
Silicon solar cells benefit from an internal Lambertian light distribution achieved through texturing, while the performance of direct-bandgap materials can be lower with than a planar cell. A novel analytic expression is derived for emittance and partial rear reflectance. This enables comparison Si, GaAs, CdTe, CIS under distributions varying reflectance in Auger limit. shown to particularly beneficial thinner material higher due absorptance enhancement. It found that increases radiative...
Increased temperatures generally reduce the efficiencies and life spans of photovoltaic modules. Experimental measurements show that thin-film GaAs modules operate more than 10°C cooler Si This study identifies main thermal advantage as their high sub-bandgap reflection 77%, which dwarfs 15-26% measured on various architectures. paper proves in with textured cells is fundamentally limited compared to for without light trapping, due amplification parasitic absorption occurs trapping. N ow,...
GaN <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0.02</inf> P xmlns:xlink="http://www.w3.org/1999/xlink">0.98</inf> is a promising top junction material for Si-based tandem solar cell, offering the correct lattice constant and bandgap an optimal three-terminal device. A key challenge dilute nitride materials achieving sufficiently high carrier lifetimes. This paper presents detailed investigation of lifetimes in GaNP matched to Si as well...
In the above paper, there were errors in digitizing spectral irradiance and extinction coefficient arrays. With fixed to tabulated AM1.5G standard, full-spectrum absorptance of GaAs changes by 2%. This change is on order uncertainty reflectance measurements. Furthermore, this can be balanced a proportional increase convection coefficient, leading no visible most figures. However, last two figures, 1%–3% for 1 °C modeled temperatures. error commensurate with sample-to-sample variability...
Improved photovoltaic efficiencies by incorporating an internal front reflector in addition to ideal back is limited devices with absorber bandgaps below ~1.34 eV due the availability of AM1.5G photons above energy-cutoff, i.e. bandgap. However, energy-selective reflectors especially benefit under monochromatic illumination, laser power converters (LPCs). The efficiency improvements and without a as function solar cell bandgap are compared versus light at For GaAs cell, where reflectance...
The open-circuit voltage of solar cells benefits from highly internally reflective surfaces on the front and rear that restrict radiative recombination current losses lead to maximum device efficiency. While back reflector reflects emitted photons broadly, an energy-selective is tailored reflect with energies below designed energy can be energetically situated just above cell absorber bandgap. Devices restriction show a V <sub xmlns:mml="http://www.w3.org/1998/Math/MathML"...
Abstract By building on the generalized Hovel model, this work develops an analytical solution to unify photon recycling, light trapping, and carrier transport in solar cells. Enhanced due recycling diffusion is considered. While often negligible, it can significantly support cases where charge low but radiative efficiency high. Next, equation solved determine collection for planar textured Results elucidate novel features external quantum (EQE) curve that occur cells with high absorption...
Photonic power converters (PPC) are photovoltaic devices that convert monochromatic light into electricity. Recent records with III-V PPC have achieved 68.9% but demand high carrier lifetimes. This report shows the introduction of trapping can yield substantially higher efficiencies, as all incident is weakly absorbed and thus amenable to absorption enhancement. For PPCs low lifetimes (i.e., 1–100 ns for moderately-doped GaAs), yields significant gains by enabling thinning material reduction...