Near-Unity Emitting Copper-Doped Colloidal Semiconductor Quantum Wells for Luminescent Solar Concentrators
Near-Unity Emitting Copper-Doped Colloidal Semiconductor Quantum Wells for Luminescent Solar Concentrators
复制标题
DOI：
10.1002/adma.201700821
复制
发表时间：
2017-08-11
影响因子：
29.4
通讯作者：
Demir, Hilmi Volkan
中科院分区：
文献类型：
--
作者：
Sharma, Manoj;Gungor, Kivanc;Demir, Hilmi Volkan
体半导体的掺杂在光电子应用中取得了广泛的成功。在过去的几十年里，人们已经为纳米级的掺杂做出了大量的努力。最近，掺杂的胶体量子点（CQD）已被证明是用于发光太阳能集中器（LSC）的有前途的材料，因为它们可以被设计用于在太阳光谱中提供高度可调谐和斯托克斯位移的发射。然而，针对全太阳能光谱LSC的现有掺杂CQD遭受适度低的量子效率、固有的小吸收截面以及与发射光谱一致的逐渐增加的吸收分布，这一起从根本上限制了它们的有效使用。在这里，作者显示了第一个帐户的铜掺杂到原子平面胶体量子威尔斯（CQWs）。除了斯托克斯位移和可调谐的掺杂剂诱导的光致发光发射之外，铜掺杂到CQW中能够实现接近1的量子效率（高达约97%），伴随着与掺杂的CQD相比的相当高的吸收截面和固有的阶梯状吸收轮廓。基于这些特殊的性质，作者已经通过实验分析和数值模拟表明，这些新合成的掺杂CQW是LSC的优秀候选者。这些发现可能为在LSC中部署掺杂的CQW以用于先进的太阳光收集技术开辟新的方向。
Doping of bulk semiconductors has revealed widespread success in opto-electronic applications. In the past few decades, substantial effort has been engaged for doping at the nanoscale. Recently, doped colloidal quantum dots (CQDs) have been demonstrated to be promising materials for luminescent solar concentrators (LSCs) as they can be engineered for providing highly tunable and Stokes-shifted emission in the solar spectrum. However, existing doped CQDs that are aimed for full solar spectrum LSCs suffer from moderately low quantum efficiency, intrinsically small absorption cross-section, and gradually increasing absorption profiles coinciding with the emission spectrum, which together fundamentally limit their effective usage. Here, the authors show the first account of copper doping into atomically flat colloidal quantum wells (CQWs). In addition to Stokes-shifted and tunable dopant-induced photoluminescence emission, the copper doping into CQWs enables near-unity quantum efficiencies (up to approximate to 97%), accompanied by substantially high absorption cross-section and inherently step-like absorption profile, compared to those of the doped CQDs. Based on these exceptional properties, the authors have demonstrated by both experimental analysis and numerical modeling that these newly synthesized doped CQWs are excellent candidates for LSCs. These findings may open new directions for deployment of doped CQWs in LSCs for advanced solar light harvesting technologies.