TY  - THES
AU  - Cadiz Bedini, Andrew Paolo
TI  - Sonochemical Synthesis of Silicon Hydride Polymers and Silicon Nanoparticles from Liquid Silanes
VL  - 423
PB  - RWTH Aachen
VL  - Dissertation
CY  - Jülich
M1  - FZJ-2018-03444
SN  - 978-3-95806-329-7
T2  - Schriften des Forschungszentrums Jülich Reihe Energie & Umwelt / Energy & Environment
SP  - viii, 132, XVIII S.
PY  - 2018
N1  - RWTH Aachen, Diss., 2018
AB  - The present thesis is concerned with the use of ultrasound for the treatment of liquid silanes with the objective of fabricating solution-processable inks containing silicon hydride polymers and silicon nanoparticles. Also demonstrated is the subsequent use of the inks to deposit semiconducting hydrogenated amorphous silicon(a-Si:H) thin films and for fabricating passivation layers and thin-film photovoltaicdevices.The sonochemical effects of ultrasound on two lower silanes, namely cyclopentasilane(Si5H10) and trisilane (Si3H8) were studied. The processing of the silanes wascarried out in the inert N2-atmosphere and in solution using cyclooctane (C8H16)as solvent at ambient pressure, and at temperatures between -15–70 $^{\circ}$C. Using cyclopentasilane as monomer molecule it was shown via size exclusion chromatography and optical transmission measurements that sonication of 8–15 wt% solutions results in ring-opening polymerization without the need to use ultraviolet light. In addition, through comparisons to purely thermally treated solutions it was demonstrated that the polymerization process is not initiated pyrolytically due to the “macroscopic” temperature of the solution itself, but rather that microscopic effects associated with acoustic cavitation are most likely responsible for triggering polymer growth. [...]
LB  - PUB:(DE-HGF)3 ; PUB:(DE-HGF)11
UR  - https://juser.fz-juelich.de/record/848178
ER  -