Ultrafast carrier relaxation and nonequilibrium phonons in hot carrier solar cells
Ultrafast carrier relaxation and nonequilibrium phonons in hot carrier solar cells
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热载流子太阳能电池中的超快载流子弛豫和非平衡声子
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
C. Honsberg
中科院分区：
文献类型：
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作者：
S. Goodnick;C. Honsberg
光伏器件中的第三代概念主要取决于量子阱、线和点等纳米结构中极短时间尺度上的超快载流子弛豫和电子-声子相互作用的动力学。热载流子太阳能电池尤其依赖于吸收材料中能量弛豫率的降低，其中热载流子通过能量选择性接触被提取。在这里，我们使用集成蒙特卡罗（EMC）模拟与速率方程模型相结合，研究了不同光激发条件下量子阱、热电子太阳能电池中的短时载流子弛豫，以了解影响电池性能的限制因素。我们特别关注热声子在降低能量损失率方面的潜在作用，以实现足够的载流子温度以实现高效性能。
Third generation concepts in photovoltaic devices depend critically on the dynamics of ultrafast carrier relaxation and electron-phonon interactions on very short times scales in nanostructures such as quantum wells, wires and dots. Hot carrier solar cells in particular depend on the reduction in the energy relaxation rate in an absorber material, where hot carriers are extracted through energy selective contacts. Here we investigate the short time carrier relaxation in quantum well, hot electron solar cells under varying photoexcitation conditions using ensemble Monte Carlo (EMC) simulation coupled with rate equation models, to understand the limiting factors affecting cell performance. In particular, we focus on the potential role of hot phonons in reducing the energy loss rate in order to achieve sufficient carrier temperature for efficient performance.