辐射极限下微应变平衡量子阱聚光器单元
Mirrored strain-balanced quantum well concentrator cells in the radiative limit
摘要：
应变平衡量子阱太阳能电池（SB-QWSC）在集中器电流水平下以辐射为主。在掺杂衬底的背面上设置背表面反射镜导致该辐射复合电流的减小，而在较低偏压下的非辐射暗电流保持不变。这项工作扩展了以前的辐射暗电流模型的细胞，其中基板是不是一个完美的吸收水槽发射的发光，包括多次通过辐射复合发射的光子。这种镜像结构中的发光减少并且辐射暗电流降低。该结构适合于聚光器应用，因为它对应于高效率极限，其中由于光再发射引起的损失限于用于吸收太阳辐射的立体角。
英文摘要：
Strain-balanced Quantum Well Solar Cells (SB- QWSCs) are radiatively dominated at concentrator current levels. Incorporating back surface mirrors on the back of the doped substrate leads to a reduction in this radiative recombination current while the non-radiative dark current at lower bias remains unchanged. This work extends a previous model of radiative dark currents to cells where the substrate is not a perfectly absorbing sink for emitted luminescence by including multiple passes of photons emitted by radiative recombination. The luminescence in such mirrored structures is reduced and the radiative dark current lower. The structure is suited to concentrator applications because it corresponds to the high efficiency limit where losses due to light re-emission are limited to the solid angle for absorption of solar radiation.
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