On momentum conservation and thermionic emission cooling
On momentum conservation and thermionic emission cooling
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关于动量守恒和热电子发射冷却
DOI：
10.1063/1.3295899
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发表时间：
2009
影响因子：
3.2
通讯作者：
Mark S. Lundstrom
中科院分区：
文献类型：
--
作者：
Raseong Kim;Changwook Jeong;Mark S. Lundstrom
本文研究了通过放宽横向动量守恒来提高超声速冷却装置性能的可能性。建立了弹道发射电流的上限。然后表明，在大多数情况下，非守恒横向动量模型产生的电流超过这个上限。然而，对于在势垒中具有重得多的有效质量并且具有低势垒高度的异质结的情况，放松横向动量可以增加电流。这些结果可以简单地从一般原理来理解，即电流受位置限制，阱或势垒，具有最小数量的导电通道。他们还表明，在电子发射框架内，放松横向动量守恒在大多数情况下不会增加上限性能，当它增加时，增加是适度的。然而，更一般地，特别是当与载体储存器的连接不良并且性能远低于上限时，放松la…
The possibility of increasing the performance of thermionic cooling devices by relaxing lateral momentum conservation is examined. Upper limits for the ballistic emission current are established. It is then shown that for most cases, nonconserved lateral momentum model produces a current that exceeds this upper limit. For the case of heterojunctions with a much heavier effective mass in the barrier and with a low barrier height, however, relaxing lateral momentum may increase the current. These results can be simply understood from the general principle that the current is limited by the location, well or barrier, with the smallest number of conducting channels. They also show that within a thermionic emission framework, relaxing lateral momentum conservation does not increase the upper limit performance in most cases, and when it does, the increase is modest. More generally, however, especially when the connection to the carrier reservoir is poor and performance is well below the upper limit, relaxing la...