Semiconductor two-dimensional (2D) nanoplatelets (NPLs) possess narrow emission bandwidths, large absorption cross sections, and low auger recombination rates, which are considered as a promising material for optoelectronic device applications. However, the low stability of optical performance of 2D NPLs greatly limits their practical applications. To solve these issues, a great number of heterostructures based on 2D NPLs have emerged in recent years. The fabricated heterostructures show superior and novel properties beyond the pristine NPLs, which are expected to achieve better performance on the optoelectronic device. Herein, we give a review on the recent advances of 2D semiconductor NPLs, as well as the corresponding heterostructures, using cadmium selenide (CdSe) as a model system. In this Review, we first introduce the development of the 2D CdSe NPLs with a focus on their mechanism investigation and preparation methods. Afterward, the optical properties and applications of various heterostructures based on CdSe NPLs are presented. Finally, we will discuss the current challenges and opportunities. We hope the present Review on the CdSe NPLs-based heterostructures will give a comprehensive summary for the interested readers, and call for more experimental and theoretical efforts for this promising area in the future.

中文翻译：

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二维CdSe纳米片中的异质结构：合成，光学性质和应用

半导体二维（2D）纳米片（NPL）具有窄的发射带宽，大的吸收横截面和低的螺钻复合率，被认为是光电子器件应用的有前途的材料。然而，二维不良贷款的光学性能的低稳定性极大地限制了其实际应用。为了解决这些问题，近年来出现了许多基于2D NPL的异质结构。所制造的异质结构显示出超越原始NPL的优越和新颖的特性，而原始NPL有望在光电器件上实现更好的性能。本文中，我们以硒化镉（CdSe）为模型系统，对2D半导体NPL及其相应的异质结构的最新进展进行了综述。在这篇评论中，我们首先介绍2D CdSe NPL的开发，重点是其机理研究和制备方法。然后，介绍了基于CdSe NPL的各种异质结构的光学性质和应用。最后，我们将讨论当前的挑战和机遇。我们希望当前关于基于CdSe NPLs的异质结构的综述能够为感兴趣的读者提供全面的总结，并呼吁在未来这个有希望的领域进行更多的实验和理论上的努力。