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One-Pot Synthesis of Gel Glass Embedded with Luminescent Silicon Nanoparticles
摘要： Preparation of highly luminescent glasses involves expensive and complicated processes and usually requires high temperature. In this work, we show that luminescent silicon (Si) nanoparticle (NP)- embedded silicate gel glasses can be developed under near-ambient conditions by a remarkably simple, one-pot strategy, without using any sophisticated instrumentation or technique. Simultaneous hydrolysis and reduction of (3-aminopropyl)triethoxysilane leads to the formation of colloidal Si nanocrystals that can be transformed to a glassy phase upon slow evaporation followed by freezing. Structural investigations reveal the formation of a sodium silicate gel glass framework having discernible shear bands, along with embedded Si NPs. High photoluminescence quantum yield (ca. 35?40%), low glass-transition temperature (Tg ≈ 66?73 °C), strain-tolerant mechanical stability, and inexpensive preparation make the glass attractive for applications as display materials and photonic converters.
关键词： luminescence,silicon,gel glass,nanoparticles,photon conversion
更新于2025-11-21 11:01:37
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Yolk-shell SnO2@TiO2 nanospheres as electron transport layer in mesoscopic perovskite solar cell
摘要： SnO2 nanoparticles were synthesized and modified by TiO2 shell through sol–gel method. Band gap energy and photoluminescence properties of SnO2 nanoparticles and yolk-shell SnO2@TiO2 nanospheres were investigated by UV–Vis absorption spectra and photoluminescence (PL) spectroscopy. The nanoparticles were used as electron transport layers (ETLs) for fabrication of perovskite solar cells (PSCs) and PSC based on yolk-shell SnO2@TiO2 ETL showed higher photon conversion efficiency (PCE = 11.28%) and lower hysteresis index (37%) compared with the PSC made of SnO2 ETL (PCE = 8.55% and hysteresis index = 52%). The increase in the short-circuit current density (Jsc), open circuit voltage (Voc), and subsequently PCE for the PSC based on yolk-shell SnO2@TiO2 ETL is attributed to the smoothness and uniformity of perovskite film, improvement of surface defects at the ETL/perovskite interface, and suitable energy band alignment for effective injection of electron from perovskite to the conduction band of TiO2 as well as from TiO2 to the SnO2. Electrochemical impedance spectroscopy (EIS) was employed to determine the charge transport resistance at the ETL/perovskite interface and confirmed the results obtained by the characteristic curve of the current density–voltage. The stability test of the devices displayed that long-term stability of PSC made of yolk-shell SnO2@TiO2 ETL is almost the same as the SnO2 ETL-based PSC because of the high resistance of SnO2 against the moisture and oxygen in the environment.
关键词： Yolk-shell SnO2@TiO2 nanospheres,Long-term stability,Perovskite solar cell,Photon conversion efficiency,Electron transport layer
更新于2025-09-16 10:30:52