Influence of Elevated Radiative Lifetime on Efficiency of CdSe/CdTe Type II Colloidal Quantum Dot Based Solar Cells
Influence of Elevated Radiative Lifetime on Efficiency of CdSe/CdTe Type II Colloidal Quantum Dot Based Solar Cells
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DOI：
10.1016/j.solmat.2016.01.018
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发表时间：
2017
影响因子：
6.9
通讯作者：
M. Leontiadou;E. J. Tyrrell;Charles T Smith;Daniel Espinobarro-Velázquez;R. Page;P. O’Brien;J. Miloszewski;T. Walsh;D. Binks;S. Tomić
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文献类型：
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作者：
M. Leontiadou;E. J. Tyrrell;Charles T Smith;Daniel Espinobarro-Velázquez;R. Page;P. O’Brien;J. Miloszewski;T. Walsh;D. Binks;S. Tomić
胶体量子点（CQD）是一种很有前途的太阳能电池材料，因为它们的光电性能很容易通过控制它们的尺寸、结构和成分来调节。本文采用单粒子（2，6）带k· p和多电子组态相互作用（CI）哈密顿量相结合的方法，计算了不同核直径和壳厚度的CdSe/CdTe核/壳II型CQDs的带隙和辐射寿命.通过与实验吸收光谱和光致发光衰减数据的比较，验证了这些计算的正确性。然后将结果纳入光伏效率模型，该模型演示了基于II型CQD的太阳能电池的整体性能如何受到核/壳几何形状变化的影响。对光伏效率的最大影响被发现是由于通过增加壳厚度产生的较长的辐射寿命。
Colloidal quantum dots (CQDs) are promising materials for solar cells because their optoelectronic properties are easily adjusted by control of their size, structure and composition. We present calculations of the band gap and radiative lifetime for varying core diameter and shell thickness of CdSe/CdTe core/shell Type II CQDs using a combination of single particle (2, 6)-band k· p and many-electron configuration interaction (CI) Hamiltonians. These calculations are validated by comparison with experimental absorption spectra and photoluminescence decay data. The results are then incorporated into a model of photovoltaic efficiency which demonstrates how the overall performance of a solar cell based on Type II CQDs is affected by changes in the core/shell geometry. The largest effect on photovoltaic efficiency is found to be due to the longer radiative lifetime produced by increasing the shell thickness.