Management of losses (thermalization-transmission) in the Si-QDs inside 3C–SiC to design an ultra-high-efficiency solar cell

Heidarzadeh, Hamid; Rostami, Ali; Dolatyari, Mahboubeh

doi:10.1016/j.mssp.2020.104936

Cited by 25 publications

(12 citation statements)

References 47 publications

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“…The practical losses, discussed here, can be reduced by improving the design and fabrication of the components of the TPV system. These losses consist of the optical losses [34] such as the thermalization losses due to the bandgap energy being considerably smaller than the energy in emission spectrum [35]; non-absorption losses, due to the proportion of emission spectrum, reported to have an average value of 55% [36], having energy below the bandgap energy of cell; reflection losses, due to the photons being reflected from the top-most layer of TPV cell and not being reabsorbed by the emitter due to a large emitter-cell distance; and transmission losses due to absorption in the TPV cell's layers thicknesses [37,38]. Moreover, there are also radiative losses such as the emitter-to-cell loss caused due to the cell and emitter not being placed close enough and having a view factor below 1 [39].…”

Section: B Losses In a Tpv Systemmentioning

confidence: 99%

Efficiency Enhancement of a Thermophotovoltaic System Integrated With a Back Surface Reflector

et al. 2020

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This work aims to investigate the various factors which may affect a thermophotovoltaic (TPV) system's performance, with a special focus on the importance of incorporating a back surface reflector (BSR), which enables below-bandgap photons' recycling. The possible extent to which common PV materials can be used in TPV applications is investigated by comparing them on a Planck distribution curve. The effects of varying BSR reflectivity, TPV cell's external quantum efficiency, and emitter temperature are investigated on the TPV module's efficiency using open-circuit voltage, empirical relations for fill factor, maximum voltage, and photogenerated current. It is shown that TPV applications require materials with smaller (e.g. 0.6 eV < Eg ≤ 0.74 eV) bandgap energy, e.g. In0.53Ga0.47As (0.74 eV), due to their high percentage of energy (> 26%) abovebandgap without a spectral control and a small difference between peak and bandgap wavelength. It is shown that the inclusion of a BSR (reflectivity = 1) results in an increase of 15% in TPV efficiency. The results show that by the collective changes of an added BSR, high emitter temperature (> 2000 K), and improved external quantum efficiency (EQE ≈ 1), the present TPV systems can attain efficiency values more than 30% which makes them a favorable prospective choice for Concentrated Solar Power.

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Section: B Losses In a Tpv Systemmentioning

confidence: 99%

Efficiency Enhancement of a Thermophotovoltaic System Integrated With a Back Surface Reflector

et al. 2020

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“…This is known as thermalization loss. [ 37 ]

L_{Th} = \int_{E_{normalg}}^{\infty} E \cdot false(E, T_{S}, Ω_{abs} false) normald E^{normalo} -^{o} E_{g} \int_{E_{g}}^{\infty} ϕ (E, T_{normalS}, {normalΩ}_{abs}) d E

…”

Section: Fundamental Losses In Solar Hydrogen Systemmentioning

confidence: 99%

Quantifying and Comparing Fundamental Loss Mechanisms to Enable Solar‐to‐Hydrogen Conversion Efficiencies above 20% Using Perovskite–Silicon Tandem Absorbers

Sharma

Beck

2020

Adv Energy and Sustain Res

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Photovoltaic (PV)‐based solar hydrogen generation is a promising pathway for the scalable production of renewable fuels. Understanding the limitations of solar‐to‐hydrogen (STH) conversion efficiencies is critical to identify performance limits and conceptualize practical device designs. Herein, the losses in PV‐based solar hydrogen generation systems are quantified and the potential of loss‐mitigation techniques to improve the STH efficiency is assessed. The analysis shows that the two largest losses in an ideal system are current and voltage mismatches due to suboptimal system configurations and energy lost as heat in the PV component. A temperature‐dependent model is developed to evaluate the relative potential of two techniques to mitigate these losses: decoupling the PV system to remove current and voltage matching requirements and thermal integration to use the heat losses from PV to increase the electrolyte temperature and improve the reaction dynamics for water splitting. It is shown that optimal system configuration strategies provide more than three times the STH efficiency increase of thermal integration at high operating temperatures. Combining both techniques results in predicted STH efficiencies approaching 20% for low‐cost perovskite–silicon tandem‐based systems with earth‐abundant catalysts at realistic working temperatures.

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“…These problems are inevitable due to the late start of research into engineering machinery. Hence, the energy conservation and emission reduction raise a growing concern in the industry [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Design and Analysis of Thermal Management System of Power Matching Transmission in Energy Machinery

Zhong¹

2021

IJHT

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With the technical development of energy conservation and emission reduction technology, the internal structure of engineering machinery has become denser. The rising full-machine heat load that ensues challenges the effect of the cooling system. In the traditional thermal management system for the transmission in energy machinery, the cooling capacity does not fully match the load of each subsystem, and the thermal management components cannot adapt to the dynamic cooling demand of engineering machinery. To solve these problems, this paper designs and analyzes the thermal management system of power matching transmission in energy machinery. Firstly, the energy distribution among different components of engineering machinery, including, hydraulic system, transmission system, and cooling system, was described in each work section, and the dynamic matching method was detailed for hydraulic torque converter. Then, heat source engine, hydraulic torque converter, and hydraulic retarder were selected as the targets of thermal management for the power transmission system of loader. Next, the thermal management cycle was framed as a scheme in which the engine transmission system is independent with the cooling circulation system, and a heat transfer calculation model was constructed for loader transmission system. The proposed model was proved effective through experiments. The research results provide a reference for the thermal management of other subsystems of engineering machinery.

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Management of losses (thermalization-transmission) in the Si-QDs inside 3C–SiC to design an ultra-high-efficiency solar cell

Cited by 25 publications

References 47 publications

Efficiency Enhancement of a Thermophotovoltaic System Integrated With a Back Surface Reflector

Efficiency Enhancement of a Thermophotovoltaic System Integrated With a Back Surface Reflector

Quantifying and Comparing Fundamental Loss Mechanisms to Enable Solar‐to‐Hydrogen Conversion Efficiencies above 20% Using Perovskite–Silicon Tandem Absorbers

Design and Analysis of Thermal Management System of Power Matching Transmission in Energy Machinery

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