Light Management with Nanostructures for Optoelectronic Devices

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• 作者：Siu-Fung Leung ; Qianpeng Zhang ; Fei Xiu ; Dongliang Yu ; Johnny C. Ho ; Dongdong Li ; Zhiyong Fan
• 刊名：The Journal of Physical Chemistry Letters
• 出版年：2014
• 出版时间：April 17, 2014
• 年：2014
• 卷：5
• 期：8
• 页码：1479-1495
• 全文大小：797K
• 年卷期：v.5,no.8(April 17, 2014)
• ISSN：1948-7185

文摘

Light management is of paramount importance to improve the performance of optoelectronic devices including photodetectors, solar cells, and light-emitting diodes. Extensive studies have shown that the efficiency of these optoelectronic devices largely depends on the device structural design. In the case of solar cells, three-dimensional (3-D) nanostructures can remarkably improve device energy conversion efficiency via various light-trapping mechanisms, and a number of nanostructures were fabricated and exhibited tremendous potential for highly efficient photovoltaics. Meanwhile, these optical absorption enhancement schemes can benefit photodetectors by achieving higher quantum efficiency and photon extraction efficiency. On the other hand, low extraction efficiency of a photon from the emissive layer to outside often puts a constraint on the external quantum efficiency (EQE) of LEDs. In this regard, different designs of device configuration based on nanostructured materials such as nanoparticles and nanotextures were developed to improve the out-coupling efficiency of photons in LEDs under various frameworks such as waveguides, plasmonic theory, and so forth. In this Perspective, we aim to provide a comprehensive review of the recent progress of research on various light management nanostructures and their potency to improve performance of optoelectronic devices including photodetectors, solar cells, and LEDs.