非补偿n-p共掺杂TiO2中带太阳电池的等效电路描述
Equivalent Circuit Description of Non-compensated n-p Codoped TiO2 as Intermediate Band Solar Cells
摘要：
非补偿n-p共掺杂的新概念使得在TiO 2的本征带隙中产生可调谐的中间带成为可能，使得共掺杂的TiO 2成为开发中间带太阳能电池（IBSC）的有前途的材料。在这里，我们调查的量子效率，这样的IBSC在两种情况下-有和没有电流提取的扩展中间带。使用理想等效电路模型，我们发现，在第一种情况下的最大效率为57%，在第二种情况下的53%，都远远高于肖克利-奎瑟限制从单间隙太阳能电池。我们还获得了电路的各种关键量，这是基于TiO 2的太阳能电池调用设备集成的现实发展中的有用的一步。这些等效电路的结果也比较直接从考虑的能带之间的电子跃迁获得的效率，这两种方法揭示了有趣的存在的双峰的最大量子效率作为IB的相对位置的函数。
英文摘要：
The novel concept of non-compensated n-p codoping has made it possible to create tunable intermediate bands in the intrinsic band gap of TiO2, making the codoped TiO2 a promising material for developing intermediate band solar cells (IBSCs). Here we investigate the quantum efficiency of such IBSCs within two scenarios - with and without current extracted from the extended intermediate band. Using the ideal equivalent circuit model, we find that the maximum efficiency of 57% in the first scenario and 53% in the second are both much higher than the Shockley-Queisser limit from single gap solar cells. We also obtain various key quantities of the circuits, a useful step in realistic development of TiO2 based solar cells invoking device integration. These equivalent circuit results are also compared with the efficiencies obtained directly from consideration of electron transition between the energy bands, and both approaches reveal the intriguing existence of double peaks in the maximum quantum efficiency as a function of the relative location of IBs.
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