Interface structure and defects of silicon nanocrystals embedded into a-SiO2

Ippolito, Mariella; Meloni, Simone; Colombo, Luciano
October 2008
Applied Physics Letters;10/13/2008, Vol. 93 Issue 15, p153109
Academic Journal
By means of large-scale atomistic simulations, we identity and characterize several kinds of bonding and coordination defects at the interface between a silicon nanoparticle and an embedding amorphous silicon dioxide matrix. In particular, we prove that interface bond defects are easily formed, while no Si–O double bond is observed. We conclude that optical properties, e.g., photoluminescence, are more likely due to such interface bond structures. Temperature effects on defect population and nature are discussed as well.


Related Articles

  • Tuning the properties of Ge and Si nanocrystals based structures by tailoring the preparation conditions Review. CIUREA, M. L.; LEPADATU, A. M. // Digest Journal of Nanomaterials & Biostructures (DJNB);Jan-Mar2015, Vol. 10 Issue 1, p59 

    Ge and Si nanocrystals (NCs), quantum dots (QDs), and amorphous nanoparticles (NPs) have a significant role in the developement of micro- and nanoelectronic devices due to capability to tune their electrical and photoconductive properties by tailoring the morphology and structure parameters. Ge...

  • Frequency-dependent bifurcation point between field-cooled and zero-field-cooled dielectric constant of LiTaO3 nanoparticles embedded in amorphous SiO2. Kohiki, Shigemi; Kawakami, Shintaro; Nogami, Shinichiro; Takada, Syozo; Shimooka, Hirokazu; Okui, Masato; Fukushima, Sei; Mitome, Masanori; Bando, Yoshio // Applied Physics Letters;4/26/2004, Vol. 84 Issue 17, p3385 

    Splitting between the field-cooled dielectric constant and the zero-field-cooled dielectric constant was observed for a diluted system of LiTaO3 nanoparticles (diameter ≈30 Å) embedded in amorphous SiO2. At the applied field frequency of 100 kHz, the real part of the field-cooled...

  • Oxidation of silicon nanoparticles produced by nanosecond laser ablation in liquids. Vaccaro, L.; Camarda, P.; Messina, F.; Buscarino, G.; Agnello, S.; Gelardi, F. M.; Cannas, M.; Boscaino, R. // AIP Conference Proceedings;2014, Vol. 1624, p174 

    We investigated nanoparticles produced by laser ablation of silicon in water by the fundamental harmonic (1064 nm) of a ns pulsed Nd:YAG. The silicon oxidation is evidenced by IR absorption features characteristic of amorphous SiO2 (silica). This oxide is highly defective and manifests a...

  • Nanocrystallization of amorphous (Fe1-xCox)88Zr7B4Cu1 alloys and their soft magnetic properties. Babu, Diraviam Arvindha; Majumdar, Bhaskar; Sarkar, Rajdeep; Raja, Muthuvel Manivel; Akhtar, Dilshad // Journal of Materials Research;8/28/2011, Vol. 26 Issue 16, p2065 

    Amorphous ribbons of (Fe1-xCox)88Zr7B4Cu1 (x = 5 0.2, 0.35, 0.5, and 0.6) alloys were annealed to produce a nanocrystalline phase dispersed in the amorphous matrix. Precision lattice parameter calculation showed that composition of the nanocrystalline phase is Fe73Co27 for all the alloys...

  • Thermally induced structural transformations on polymorphous silicon. Rath, Chandana; Farjas, J.; Roura, P.; Kail, F.; Roca i Cabarrocas, P.; Bertran, E. // Journal of Materials Research;Sep2005, Vol. 20 Issue 9, p2562 

    Polymorphous Si is a nanostructured form of hydrogenated amorphous Si that contains a small fraction of Si nanocrystals or clusters. Its thermally induced transformations such as relaxation, dehydrogenation, and crystallization have been studied by calorimetry and evolved gas analysis as a...

  • Upconversion and pump saturation mechanisms in Er3+/Yb3+ co-doped Y2Ti2O7 nanocrystals. Fengxiao Wang; Feng Song; Gong Zhang; Yingdong Han; Qiong Li; Chengguo Ming; Jianguo Tian // Journal of Applied Physics;2014, Vol. 115 Issue 13, p134310-1 

    The Er3+/Yb3+ co-doped Y2Ti2O7 nanocrystals were synthesized by the sol-gel method. X-ray diffraction, transmission electronic microscopy, and photoluminescence spectra were measured to verify the Y2Ti2O7 nanocrystalline produced in the sample annealed at 800 °C. The anomalous slopes of the...

  • Annealing-induced evolution of optical properties of the multilayered nanoperiodic SiO/ZrO system containing Si nanoclusters. Ershov, A.; Tetelbaum, D.; Chugrov, I.; Mashin, A.; Mikhaylov, A.; Nezhdanov, A.; Karabanova, I. // Semiconductors;Jun2011, Vol. 45 Issue 6, p731 

    The photoluminescence, infrared absorption, and Raman spectra of amorphous multilayered nanoperiodic a-SiO/ZrO structures produced by vacuum evaporation and then annealed at different temperatures (500-1100°C) are studied. It is established that the evolution of the optical properties with...

  • Intense visible photoluminescence in amorphous SiO[sub x] and SiO[sub x]:H films prepared by evaporation. Rinnert, H.; Vergnat, M.; Marchal, G.; Burneau, A. // Applied Physics Letters;6/15/1998, Vol. 72 Issue 24 

    Visible photoluminescence (PL) can be observed in a-SiO[sub x] and a-SiO[sub x]:H alloys prepared by evaporation of SiO in ultrahigh vacuum and under a flow of hydrogen ions, respectively. The hydrogen and oxygen bonding is studied by infrared spectrometry. The hydrogen stability is followed by...

  • Ordered Si/Si-O nanowire array and its optical properties. Mondal, A.; Singh, N.; Chinnamuthu, P.; Dhar, J.; Das, T.; Bose, P. // Applied Physics A: Materials Science & Processing;Feb2013, Vol. 110 Issue 2, p479 

    Glancing angle deposition (GLAD) has been employed to fabricate the Si/Si-O nanowires (NWs). The perpendicular NW on silicon substrate shows the amorphous nature. The visible light emission from the NWs was observed from the Si/Si-O nanoparticles. High light absorption inside the Si/Si-O NW...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics