Photofilling of intermediate bands
Photofilling of intermediate bands
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DOI：
10.1063/1.3153141
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发表时间：
2009-06-15
影响因子：
3.2
通讯作者：
Reenaas, Turid Worren
中科院分区：
文献类型：
--
作者：
Strandberg, Rune;Reenaas, Turid Worren
建立了一个详细的中带（IB）太阳电池平衡模型。该模型允许在IB中的电子浓度变化，并假设该浓度和吸收系数之间的线性关系，相关的过渡的子带隙。数值结果表明，对于具有量子点超晶格典型态密度的IB，当电池暴露于集中光时，可以在IB中维持有用的光生电子种群。对于未集中的光，必须通过掺杂来部分填充IB，以在合理的光程长度内实现高效率。IB的填充被示出为随着光强度、电池电压、IB状态的密度以及IB在主带隙中的定位而变化，这两个定位用于通过掺杂部分填充的电池和用于光填充的电池。(C)2009年美国物理学会。[DOI：10.1063/1.3153141]
A detailed balance model for the intermediate band (IB) solar cell has been developed. The model allows the electron concentration in the IB to vary and assumes a linear relation between this concentration and the absorption coefficients related to transitions over the subband gaps. Numerical results show that for IBs with densities of states typical for quantum dot-superlattices it is possible to sustain a useful population of photogenerated electrons in the IB when the cell is exposed to concentrated light. For unconcentrated light the IB must be partially filled by means of doping to achieve high efficiencies within reasonable optical path lengths. The filling of the IB is shown to vary with light intensity, cell voltage, density of IB-states, and the positioning of the IB in the main band gap both for cells that are partially filled by doping and for photofilled cells. (C) 2009 American Institute of Physics. [DOI: 10.1063/1.3153141]