Preparation and photovoltaic properties of silicon quantum dots embedded in a dielectric matrix: a review

Surface Engineering of Silicon Quantum Dots: Does the Ligand Length Impact the Optoelectronic Properties of Light‐Emitting Diodes?

“…[ 13,14 ] This effect has been studied in numerous silicon nanostructures, such as porous silicon, [ 15 ] Si wires, [ 16 ] 2D Si sheets, [ 17 ] and Si QDs (SiQDs). [ 18,19 ] Especially SiQDs have gained significant attention in numerous research fields, such as solar cells, [ 20 ] nonlinear optics, [ 21 ] sensors, [ 22 ] biomedical applications, [ 23 ] field‐effect transistors, [ 24 ] and LEDs. [ 25 ] Suitable SiQDs for LED fabrication are commonly synthesized via bottom−up and top−down approaches, namely, plasma synthesis [ 26,27 ] and solid‐state etching from SiO x matrixes.…”

Silicon Quantum Dots: Synthesis, Encapsulation, and Application in Light-Emitting Diodes

“…The application of SiQDs requires their chemical and physical stabilization (Maier-Flaig et al, 2013a;Buckley et al, 2017). Modern stabilization techniques include ligand exchange (Purkait et al, 2016) and microencapsulation in inorganic (Chen and Yang, 2015) or organic (polymer) (Dasog et al, 2016) matrixes. Organosilicon polymers, in particular, are promising candidates for encapsulation due to their affinity to SiQDs, high transparency in the visible region, and high thermal and photostability (Pagliaro, 2009;Vinogradov and Vinogradov, 2014).…”

“…Recent reviews on the utilization of SiQDs in bioimaging and biosensing (Cheng et al, 2014;McVey and Tilley, 2014;Cheng and Guan, 2017;Ji et al, 2018), solar cells (Chen and Yang, 2015), nonlinear optics (Bisadi et al, 2015), and photonics (Priolo et al, 2014;Zhao et al, 2018) show the broad interest and scope of the research concerning these nanomaterials. Less attention has been paid to the features of Si quantum dot-based light-emitting diodes (LEDs), even though in principle one of the most valuable applications of said quantum dots would be in making new LEDs based on abundant silicon in place of current commercial LEDs, which are based on rare earths or on organic phosphors (Buckley et al, 2017).…”

“…The presence of a shell in encapsulated silicon QDs in which the shell material consists of particles with a larger bandgap, compatible with the lattice of Si QDs, makes it possible to increase the probability of radiative recombination by isolating excitons from surface states (Gong et al, 2015). Another stabilization factor for SiQDs may be encapsulation, the variants of which are considered in the examples of solid dielectric matrices for solar cell applications (Chen and Yang, 2015) and biocompatible polymer matrices for bioimaging (Dasog et al, 2016). Aiming to provide guidelines en route to the development of the first stable Si-based light-emitting diodes, in the following, we summarize recent advances in the field of Si-based LEDs, focusing on SiQD synthesis methods affording high (45-90%) QY of photoluminescence, strategies of encapsulation, and recent progress in the formation of LEDs using Si quantum dots.…”

Formation of Blue-Emitting Colloidal Si Quantum Dots through Pulsed Discharge of Si Strips in Distilled Water Medium

“…Yang et al studied the effect of water adsorption on the PL of Si QDs. Nowadays, Si QDs play a key role in various applications, such as light-emitting diodes, − Li-ion batteries, solar cells, − luminescent solar concentrators, − biological imaging, , and medical treatment. , For example, Ghosh et al investigated the advantages of the inverted device structure for Si QD light-emitting diodes (Si-QLEDs) featuring a long device operational lifetime, a long-lived EQE value, and a low turn-on voltage at 3.5 V. Liu et al reported a new hybrid solar cells based on blends of Si QDs and poly-3 (hexylthiophene) (P3HT) polymer with the study of size effect of Si QD on properties. Kajiya et al revealed that the hole mobility and density along the out-of-plane direction of the Si- nanocrystal (8 nm size, 25 wt %)/P3HT hybrid film were enhanced 50- and 12-fold, respectively, compared with the P3HT film.…”