首页> 外文会议>Physics, simulation, and photonic engineering of photovoltaic devices II >Modification of band alignment at interface of Al_yGa_(1-y)Sb/Al_xGa_(1-x)As type-Ⅱ quantum dots by concentrated sunlight in intermediate band solar cells with separated absorption and depletion regions
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Modification of band alignment at interface of Al_yGa_(1-y)Sb/Al_xGa_(1-x)As type-Ⅱ quantum dots by concentrated sunlight in intermediate band solar cells with separated absorption and depletion regions

机译:吸收和耗尽区分开的中间带太阳能电池中的聚光太阳光对Al_yGa_(1-y)Sb / Al_xGaGa(1-x)AsⅡ型量子点界面处的能带排列的修改

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We propose a new intermediate band GaAs solar cell comprising an Al_xGa_(1-x)As absorber with built-in GaSb type-Ⅱ quantum dots (QDs) [a gradual Al_xGa_(1-x)As absorber with built-in Al_yGa_(1-y)Sb QDs (0<x=y<0.40) as a variant] separated from the depletion region. We study the modification of the band alignment at type-II interface by two-photon absorption of concentrated sunlight. Our calculation shows that photogenerated carriers produce localized exciton-like electron-hole pairs spatially separated at QDs. Local field of such pairs may essentially modify potential barrier surrounding QDs, increase recombination lifetime of mobile carriers and additional photocurrent generated by two-photon absorption. Concentration of about 300-sun pushes by 15% up the conversion efficiency as compared to the efficiency of the reference single junction GaAs solar cell without QDs.
机译:我们提出了一种新型的中带GaAs太阳能电池,该电池包括带有内置GaSbⅡ型量子点(QD)的Al_xGa_(1-x)As吸收体[带有内置Al_yGa_(1的渐进式Al_xGa_(1-x)As吸收体-y)Sb QD(0 <x = y <0.40)作为变体],与耗尽区分开。我们研究了聚光太阳光的双光子吸收对II型界面处能带排列的修改。我们的计算表明,光生载流子产生在量子点处空间分离的局部激子状电子-空穴对。这样的对的局部场可以实质上改变围绕QD的势垒,增加移动载流子的重组寿命以及由双光子吸收产生的附加光电流。与没有QD的参考单结GaAs太阳能电池的效率相比,约300太阳的浓度将转换效率提高了15%。

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