Visible electroluminescence from nanostructured silicon-based Schottky junction LED: role of metal contacts

IF 3.3 3区物理与天体物理 Q2 OPTICS

Journal of Luminescence Pub Date : 2025-04-11 DOI:10.1016/j.jlumin.2025.121249

Subhajit Roy Chowdhury , Suman Santra , Koushik Ghosh , Sudipta Chakrabarty , Jyoti Mandal , Pravat Kumar Giri , Syed Minhaz Hossain

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Abstract

This work investigates the electroluminescent properties of Schottky junction LEDs based on nanostructured silicon. Despite the challenges with low efficiency, silicon-based light sources are gaining attention due to their compatibility with optoelectronic integrated circuits. This study explores the effect of metal contacts (Silver, Gold, Copper) that play an influencing role in the electroluminescence properties of these devices, by the key parameters such as the optical transparency, work function and solid solubility of the metals in the silicon oxide matrix. These factors affect injection and extraction efficiencies, as well as the emission spectrum, which is characterized by bias-dependent multiple peaks owing to the radiative transitions between the quantum-confined Bloch states and oxide-related interface trap states within the band gap of the nanostructured silicon. Among the metal contacts studied, Silver provides the highest external quantum efficiency integrated over a broad emission spectrum, demonstrating its potential as a source in photonic devices.

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纳米结构硅基肖特基结LED的可见电致发光：金属触点的作用

本文研究了基于纳米结构硅的肖特基结led的电致发光特性。尽管存在低效率的挑战，但硅基光源由于其与光电集成电路的兼容性而受到关注。本研究通过金属在氧化硅基体中的光学透明度、功函数和固溶度等关键参数，探讨了金属触点（银、金、铜）对这些器件电致发光性能的影响。这些因素影响了注入和萃取效率，以及发射光谱，由于在纳米结构硅的带隙内，量子受限布洛赫态和氧化物相关界面阱态之间的辐射跃迁，发射光谱具有偏置相关的多峰特征。在所研究的金属触点中，银在宽发射光谱上提供了最高的外部量子效率，证明了其作为光子器件源的潜力。

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来源期刊

Journal of Luminescence 物理-光学

CiteScore

6.70

自引率

13.90%

发文量

850

审稿时长

3.8 months

期刊介绍： The purpose of the Journal of Luminescence is to provide a means of communication between scientists in different disciplines who share a common interest in the electronic excited states of molecular, ionic and covalent systems, whether crystalline, amorphous, or liquid. We invite original papers and reviews on such subjects as: exciton and polariton dynamics, dynamics of localized excited states, energy and charge transport in ordered and disordered systems, radiative and non-radiative recombination, relaxation processes, vibronic interactions in electronic excited states, photochemistry in condensed systems, excited state resonance, double resonance, spin dynamics, selective excitation spectroscopy, hole burning, coherent processes in excited states, (e.g. coherent optical transients, photon echoes, transient gratings), multiphoton processes, optical bistability, photochromism, and new techniques for the study of excited states. This list is not intended to be exhaustive. Papers in the traditional areas of optical spectroscopy (absorption, MCD, luminescence, Raman scattering) are welcome. Papers on applications (phosphors, scintillators, electro- and cathodo-luminescence, radiography, bioimaging, solar energy, energy conversion, etc.) are also welcome if they present results of scientific, rather than only technological interest. However, papers containing purely theoretical results, not related to phenomena in the excited states, as well as papers using luminescence spectroscopy to perform routine analytical chemistry or biochemistry procedures, are outside the scope of the journal. Some exceptions will be possible at the discretion of the editors.