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Decreasing dark current in long wavelength InAs/GaSb thermophotovoltaics via bandgap engineering

机译:通过带隙工程降低长波长InAs / GaSb热光电器件中的暗电流

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At present, the state of the art thermophotovoltaic diode material is GaSb, with a bandgap of 0.7 eV corresponding to source temperatures greater than 1000°C. We investigate alternative bandstructure designs using the InAs/GaSb superlattice material system, which enable shorter bandgaps corresponding to lower source temperatures. For an InAs/GaSb superlattice system, we examine the effect of a monovalent barrier inserted between the p and n-doped regions. Through simulations, with the program Silvaco, we demonstrate that this barrier decreases the dark current and increases the open-circuit voltage, improving the overall power output and, thus, extending the operational wavelength of thermophotovoltaics.
机译:目前,最先进的热光电二极管材料是GaSb,其带隙为0.7 eV,对应于高于1000°C的源极温度。我们使用InAs / GaSb超晶格材料系统研究可替代的能带结构设计,该系统可实现与较低的源温度相对应的更短的带隙。对于InAs / GaSb超晶格系统,我们研究了在p和n掺杂区域之间插入一价势垒的影响。通过仿真,使用Silvaco程序,我们证明了该势垒减少了暗电流并增加了开路电压,从而改善了总功率输出,从而扩展了热电光伏的工作波长。

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