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Performance analysis of narrow-bandgap interband cascade thermophotovoltaic cells
摘要： We present the detailed characterization and performance analysis of two sets of four interband cascade thermophotovoltaic (TPV) devices with InAs/GaSb type-II superlattice (SL) absorbers. The bandgaps of the SL absorbers in the four devices were between 0.22 and 0.25 eV at 300 K. With different numbers of cascade stages and individual absorber thicknesses, we are able to show how possible material quality variations and current mismatch between stages can affect the device performance. Based on the calculated effective quantum efficiency in each stage and experimental results, it is shown that the current mismatch between stages due to the deviation of absorption coefficient from the designed value can be substantial with more stages. On the other hand, the collection efficiency can be much improved with more stages and thin individual absorbers. Also, the carrier lifetime is extracted through measured dark current density to evaluate the material quality. The effects of material quality, current mismatch and collection efficiency on device performance are quantified and a comparison shows that material quality plays the most important role.
关键词： Interband cascade,current mismatch,carrier lifetime,thermophotovoltaic cells
更新于2025-09-19 17:13:59
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Photoluminescence characteristics of InGaP/GaAs dual-junction solar cells under current mismatch conditions
摘要： Current mismatch is a critical factor for impairing the conversion efficiency of multi-junction solar cells. Herein, we find a visual phenomenon to distinguish whether the InGaP/GaAs dual-junction solar cell is undergoing current mismatch. It is found that the device at short circuit emits red light under the multiple-source solar simulator when the incident power of the first light source is high. Furthermore, the similar photoluminescence characteristic is also observed when two different lasers are used. These results exhibit that the photoluminescence phenomenon is a facile method to identify the current mismatch of multi-junction solar cells.
关键词： dual-junction solar cells,photoluminescence,current mismatch,InGaP/GaAs
更新于2025-09-11 14:15:04