Innovative Quantum Effects in Silicon for Photovoltaic Applications

Yuan, Zhefan; Anopchenko, Aleksei; Pavesi, L.

doi:10.1002/9781118312193.ch10

Cited by 3 publications

(1 citation statement)

References 143 publications

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“…Still, there are margins of improvement by making a better use of the solar energy. Among other approaches, one enabled by Si-NCs is solar spectrum reshaping [96]. This is based on the modification of the light spectrum, which reaches the active part of the solar cell, to enhance the power conversion efficiency (PCE).…”

Section: Photovoltaicsmentioning

confidence: 99%

Thirty Years in Silicon Photonics: A Personal View

Pavesi

2021

Front. Phys.

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Silicon Photonics, the technology where optical devices are fabricated by the mainstream microelectronic processing technology, was proposed almost 30 years ago. I joined this research field at its start. Initially, I concentrated on the main issue of the lack of a silicon laser. Room temperature visible emission from porous silicon first, and from silicon nanocrystals then, showed that optical gain is possible in low-dimensional silicon, but it is severely counterbalanced by nonlinear losses due to free carriers. Then, most of my research focus was on systems where photons show novel features such as Zener tunneling or Anderson localization. Here, the game was to engineer suitable dielectric environments (e.g., one-dimensional photonic crystals or waveguide-based microring resonators) to control photon propagation. Applications of low-dimensional silicon raised up in sensing (e.g., gas-sensing or bio-sensing) and photovoltaics. Interestingly, microring resonators emerged as the fundamental device for integrated photonic circuit since they allow studying the hermitian and non-hermitian physics of light propagation as well as demonstrating on-chip heavily integrated optical networks for reconfigurable switching applications or neural networks for optical signal processing. Finally, I witnessed the emergence of quantum photonic devices, where linear and nonlinear optical effects generate quantum states of light. Here, quantum random number generators or heralded single-photon sources are enabled by silicon photonics. All these developments are discussed in this review by following my own research path.

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Section: Photovoltaicsmentioning

confidence: 99%

Thirty Years in Silicon Photonics: A Personal View

Pavesi

2021

Front. Phys.

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Silicon nanocrystals for nonlinear optics and secure communications

Bisadi

Mancinelli

Manna

et al. 2015

Physica Status Solidi (a)

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Silicon nanocrystals (Si‐nc) are reviewed here for their interesting optical applications. On the one hand, they do exhibit quantum confinement effects. This allows turning silicon into a light‐emitting material where luminescence can be excited by electrical injection. On the other hand, small sizes, large surfaces, and dielectric mismatch between the core and the surrounding matrix increase dramatically the nonlinear optical coefficients. This allows using Si‐nc as a nonlinear material in different waveguide configurations. In this paper, we discuss specifically two different applications of Si‐nc: (i) as a nonlinear material in various devices, e.g., in bistable optical cavities, in waveguide optical mode monitors that are based on two‐photon excited luminescence detection, and in wavelength shifters by using four‐wave mixing (FWM); (ii) as an entropy source for quantum random number generation, the key device for cryptography. (a) Top view optical image of a Si‐nc‐based whispering‐gallery mode (WGM) microdisk resonator, vertically coupled with a bus waveguide. (b) Detail of the coupling zone. (c) Normalized waveguide transmission spectrum over a wide spectral range. The inset shows a blow up of a resonance with the radial and azimuthal mode orders and the Q factor value indicated.

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Luminescent and Raman study of nanostruc-tures formed upon annealing of SiOx:Sm films

Michailovska¹,

Индутный²,

Shepeliavyi³

et al. 2023

SPQEO

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ncs-Si–SiO x :Sm structures formed by high-temperature air annealing of the SiO x films doped with samarium during thermal co-evaporation in vacuum of silicon monoxide and metallic Sm was studied. By measuring the spectra of photoluminescence (PL), it has been shown that doping of SiO x films with Sm stimulates their decomposition into Si and SiO 2 , and also reduces the transition temperature of silicon nanoparticle from the amorphous state to the crystalline one. With an increase in the impurity content up to 2 wt.%, along with the ncs-Si luminescence, the PL spectrum exhibits emission bands of Sm 3+ and Sm 2+ ions, which do not appear at a lower Sm concentration. The presence of silicon nanocrystals in SiO x films doped with Sm and annealed at 970 °C in air has been confirmed using Raman scattering spectra. A possible mechanism for interaction of samarium ions with the SiO x matrix and ncs-Si has been discussed.

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Innovative Quantum Effects in Silicon for Photovoltaic Applications

Cited by 3 publications

References 143 publications

Thirty Years in Silicon Photonics: A Personal View

Thirty Years in Silicon Photonics: A Personal View

Silicon nanocrystals for nonlinear optics and secure communications

Luminescent and Raman study of nanostruc-tures formed upon annealing of SiOx:Sm films

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