Elements of the design and analysis band solar of quantum-dot intermediate cells
Elements of the design and analysis band solar of quantum-dot intermediate cells
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DOI：
10.1016/j.tsf.2007.12.064
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发表时间：
2008-08-30
期刊：
影响因子：
2.1
通讯作者：
Farmer, C. D.
中科院分区：
文献类型：
--
作者：
Marti, A.;Antolin, E.;Farmer, C. D.
我们最近已经证明，在量子点中间带太阳能电池（QD-IBSC）中，两个低于带隙能量的光子可以导致一个电子空穴对的产生。为了有效，实验中使用的设备被设计为a）用电子半填充中间带; B）将量子点分配在平带电势区域中，以及c）防止从n发射极隧穿到中间带。当与没有量子点的对应物相比时，QD-IBSC还显示出其开路电压的降低。这种损失是由于中间带（113）的存在以及量子点不能吸收足够的带隙以下的光以显著地贡献于光生电流。然而，据预测，如果使用聚集光，则这种电压损失将减小，从而导致具有比单间隙太阳能电池更高的效率的装置。一个电路模型，其中包括额外的复合水平，以IB介绍的支持这一讨论。(c)2007 Elsevier B.V保留所有权利。
We have demonstrated recently that two below bandgap energy photons can lead to the creation of one electron-hole pair in a quantum-dot intermediate band solar cell (QD-IBSC). To be effective, the devices used in the experiments were designed to a) half-fill the intermediate band with electrons; b) to allocate the quantum dots in a flat-band potential region, and c) to prevent tunnelling from the n emitter into the intermediate band. QD-IBSCs have also shown degradation in their open-circuit voltage when compared with their counterparts without quantum dots. This loss is due to the presence of the intermediate band (113) together with the incapacity of the quantum dots to absorb sufficient below bandgap light as to contribute significantly to the photogenerated current. It is predicted, nevertheless, that this voltage loss will diminish if concentration light is used leading to devices with efficiency higher than single gap solar cells. A circuit model that includes additional recombination levels to the ones introduced by the IB is described to support this discussion. (c) 2007 Elsevier B.V All rights reserved.