Thermophotovoltaic Converter Impedance Matching Front Layer
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Solution Overview
Problem
Thermophotovoltaic (TPV) systems face inefficiencies due to the inability to fully convert low-energy photons into electric current and the quick decay of high-energy photons, leading to wasted energy, with existing thermal emitters not optimally matching the impedance with photovoltaic cells, resulting in suboptimal photon absorption and electric power generation.
Innovation Solution
The introduction of a thin front layer on the photovoltaic cell with surface resonant frequencies matching those of the thermal emitter, enhancing impedance matching and increasing photon absorption by aligning the surface resonance of the materials, thereby increasing the number of photons with energy above the bandgap absorbed by the cell.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the separation between the thermal emitter and the PV cell is decreased to increase photon absorption, then the number of photons absorbed by the PV cell increases, but the thermal emitter and PV cell cannot be kept at sufficiently different temperatures
Solution Approach 1:
A front layer is introduced as an intermediary component between the thermal emitter and the PV cell. This front layer has surface resonant frequencies that match those of the thermal emitter, enabling impedance matching and enhancing photon absorption by the PV cell while allowing sufficient physical separation to maintain temperature differences between the emitter and cell.
Solution Approach 2:
The surface resonant frequency of the front layer is specifically tuned to match the surface resonant frequency of the thermal emitter. This parameter matching creates impedance resonance that enhances the absorption of thermal radiation by the PV cell, resolving the contradiction between absorption efficiency and temperature maintenance.
2Quantity of substance
If a front layer is added to the PV cell for impedance matching, then the number of photons absorbed increases, but the distance between the emitter and PV cell increases reducing absorption
Solution Approach 1:
The front layer is designed with specific surface resonant frequency parameters that match the thermal emitter. This resonant parameter matching creates strong coupling between the emitter and PV cell, enabling effective photon absorption even through the additional layer, thus compensating for the increased distance.
Solution Approach 2:
The PV cell structure is modified by adding a front layer with specific material properties (surface resonant frequency matching the emitter). This composite structure enables impedance matching and enhances overall photon absorption efficiency despite the increased separation distance.
3Productivity
If the thermal emitter emits photons with energy higher than the bandgap of the PV cell to improve efficiency, then more electrons are excited to the conduction band, but high-energy photons generate hot electrons that decay quickly losing energy
Solution Approach 1:
The front layer's surface resonant frequency is matched to the thermal emitter, creating impedance resonance that enhances the absorption of photons with energies above the bandgap. This resonant coupling increases the number of photoexcited electrons, improving electric power generation despite the inherent energy loss from hot electron decay.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances the absorption of photons by the photovoltaic cell, leading to improved TPV system efficiency and increased electric power generation, outweighing the initial increase in distance between the emitter and cell, which could have otherwise reduced absorption.
Implementation Method 1
A thermal emitter to generate photons of energy in response to receiving heat
Implementation Method 2
a photovoltaic cell converting the received photons into electric energy
Implementation Method 3
the first layer of material and the second layer of material have surface resonant frequencies above a bandgap of the photovoltaic cell
Data Source
AI summary
A thermophotovoltaic (TPV) energy converter includes a thermal emitter to generate photons of energy in response to receiving heat and a thermal receiver arranged at a distance from the thermal emitter. The thermal receiver includes a photovoltaic cell converting the received photons into electric energy. The thermal emitter includes a first layer of material arranged on a surface of the thermal emitter closest to the thermal receiver. The thermal receiver includes a second layer of material arranged on a surface of the thermal receiver closest to the thermal emitter. The first layer of material and the second layer of material have surface resonant frequencies above a bandgap of the photovoltaic cell.