Absorption and photoluminescence spectra of the hydrogenated amorphous silicon with embedded silicon nanoparticles

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F16%3A00471064" target="_blank" >RIV/68378271:_____/16:00471064 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/61388980:_____/16:00471064

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Absorption and photoluminescence spectra of the hydrogenated amorphous silicon with embedded silicon nanoparticles

Popis výsledku v původním jazyce

Silicon nanoparticles (NPs) embedded in the hydrogenated amorphous silicon (a-Si:H) open the opportunity for a new nanocomposite semiconducting material suitable for low cost, large area energy conversion applications. The intrinsic hydrogenated silicone layers with embedded silicon NPs were grown in-situ on glass substrates at 250 C by the radio frequency plasma enhanced chemical vapor deposition (CVD) from silane highly diluted in hydrogen. The changes in the sub-band gap optical absorption were measured by the photothemal deflection spectroscopy (PDS). The transition from amorphous to crystalline phase for samples deposited at 5-6 % silane concentration corresponds to the crystalline volume fraction about 50 % as detected by Raman spectroscopy. The room temperature photo-luminescence increases significantly with increased crystallinity volume fraction and diminishes abruptly when crystallinity volume fraction exceeds above 80 %. Thus, we have found that the photoluminescence intensity strongly correlates with the presence of isolated silicon nanoparticles in the mixed amorphous and crystalline phase as confirmed by the high resolution transmission electron microscopy (HRTEM). The strongest photoluminescence was found in the sample with mixed phase of amorphous matrix and isolated silicon nanoparticles and the crystalline volume fraction about 50 %.

Název v anglickém jazyce

Absorption and photoluminescence spectra of the hydrogenated amorphous silicon with embedded silicon nanoparticles

Popis výsledku anglicky

Silicon nanoparticles (NPs) embedded in the hydrogenated amorphous silicon (a-Si:H) open the opportunity for a new nanocomposite semiconducting material suitable for low cost, large area energy conversion applications. The intrinsic hydrogenated silicone layers with embedded silicon NPs were grown in-situ on glass substrates at 250 C by the radio frequency plasma enhanced chemical vapor deposition (CVD) from silane highly diluted in hydrogen. The changes in the sub-band gap optical absorption were measured by the photothemal deflection spectroscopy (PDS). The transition from amorphous to crystalline phase for samples deposited at 5-6 % silane concentration corresponds to the crystalline volume fraction about 50 % as detected by Raman spectroscopy. The room temperature photo-luminescence increases significantly with increased crystallinity volume fraction and diminishes abruptly when crystallinity volume fraction exceeds above 80 %. Thus, we have found that the photoluminescence intensity strongly correlates with the presence of isolated silicon nanoparticles in the mixed amorphous and crystalline phase as confirmed by the high resolution transmission electron microscopy (HRTEM). The strongest photoluminescence was found in the sample with mixed phase of amorphous matrix and isolated silicon nanoparticles and the crystalline volume fraction about 50 %.

Druh

O - Ostatní výsledky

CEP obor

BM - Fyzika pevných látek a magnetismus

OECD FORD obor

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Projekt

<a href="/cs/project/GC16-10429J" target="_blank" >GC16-10429J: Optické, elektrické a magnetické vlastnosti ZnO nanostruktur</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2016

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů