Nanograting p-n Junctions with Enhanced Charge Confinement.

IF 4.4 3区 材料科学 Q2 CHEMISTRY, MULTIDISCIPLINARY
Nanomaterials Pub Date : 2024-11-24 DOI:10.3390/nano14231889
Avtandil Tavkhelidze, Larisa Jangidze, Givi Skhiladze, Sergo Sikharulidze, Kristine Dzneladze, Rusudan Kvesitadze, Amiran Bibilashvili
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引用次数: 0

Abstract

Recently, geometry-induced quantum effects in a new quasi-1D system, or nanograting (NG) layers, were introduced and investigated. Dramatic changes in band structure and unconventional photoluminescence effects were found in silicon quantum wells with high-energy barriers. Nanograting metal-semiconductor junctions were fabricated and investigated. Here, we report the latest results on a special type of p-n junction in which the charge confinement of the NG is enhanced. The reverse bias dark current is increased in contrast to the metal-semiconductor junctions. When such a junction works as a photovoltaic cell, NG significantly increases short-circuit current and conversion efficiency without affecting open-circuit voltage. These effects are explained by the formation of geometry-induced excitons. To distinguish exciton formation from G-doping effects, we fabricated NGs in both n-type and p-type top layers and obtained qualitatively the same results. To further verify the excitonic mechanism, we analyzed photoluminescence spectrums previously obtained from NG and other NG-like periodic structures. The collected experimental results and previous findings are well explained by the formation of geometry-induced excitons and corresponding quasi-flat bands. Geometry-induced quantum effects can be used to significantly increase the conversion efficiency of photovoltaic cells and enhance the characteristics of other optoelectronic devices.

具有增强电荷约束的纳米雾化 p-n 结。
最近,人们引入并研究了一种新的准一维系统,即纳米穿透(NG)层中的几何诱导量子效应。在具有高能垒的硅量子阱中发现了带状结构的剧烈变化和非常规的光致发光效应。我们还制作并研究了纳米金属半导体结。在此,我们报告了一种特殊 p-n 结的最新研究成果,在这种结中,NG 的电荷约束得到了增强。与金属半导体结相比,反向偏置暗电流增加了。当这种结用作光伏电池时,NG 能显著增加短路电流和转换效率,而不影响开路电压。这些效应可以用几何诱导激子的形成来解释。为了将激子形成与 G 掺杂效应区分开来,我们在 n 型和 p 型顶层都制造了 NG,并得到了本质上相同的结果。为了进一步验证激子机制,我们分析了以前从 NG 和其他类似 NG 的周期性结构中获得的光致发光光谱。收集到的实验结果和之前的发现都很好地解释了几何诱导激子和相应准平带的形成。几何诱导量子效应可用于显著提高光伏电池的转换效率和增强其他光电设备的特性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Nanomaterials
Nanomaterials NANOSCIENCE & NANOTECHNOLOGY-MATERIALS SCIENCE, MULTIDISCIPLINARY
CiteScore
8.50
自引率
9.40%
发文量
3841
审稿时长
14.22 days
期刊介绍: Nanomaterials (ISSN 2076-4991) is an international and interdisciplinary scholarly open access journal. It publishes reviews, regular research papers, communications, and short notes that are relevant to any field of study that involves nanomaterials, with respect to their science and application. Thus, theoretical and experimental articles will be accepted, along with articles that deal with the synthesis and use of nanomaterials. Articles that synthesize information from multiple fields, and which place discoveries within a broader context, will be preferred. There is no restriction on the length of the papers. Our aim is to encourage scientists to publish their experimental and theoretical research in as much detail as possible. Full experimental or methodical details, or both, must be provided for research articles. Computed data or files regarding the full details of the experimental procedure, if unable to be published in a normal way, can be deposited as supplementary material. Nanomaterials is dedicated to a high scientific standard. All manuscripts undergo a rigorous reviewing process and decisions are based on the recommendations of independent reviewers.
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