In order to investigate the wettability properties of multicrystalline silicon (mc-Si), the different surface structures were fabricated on the as-cut p-type multi-wire slurry sawn mc-Si wafers, such as as-cut, polished and etched in various acid solutions. The contact angles and the XRD spectra of these samples were measured. It was noted that both the surface structures and the use of surfactant, such as Tween 80, made a stronger effect on wettability of the Si wafer. Due to the lipophilic groups of Tween 80 combined with the Si atoms while the hydrophilic groups of it were outward, a lipophilic surface of Si changed into a hydrophilic one and the rougher the surface, the stronger the hydrophily. Thus, it is feasible to add an appropriate surfactant into the etching solution during black-Si wafer fabrication for solar cells. In addition, different crystal plains of Si had different dangling bond density, so that their surface energies were different. A surface with higher surface energy could attract more water atoms and its wettability was better. However, the effect of crystal plain on the surface wettability was much weaker than surface morphology.
|Number of pages
|Applied Physics A: Materials Science and Processing
|Published - Feb 1 2016
Bibliographical noteFunding Information:
This work was supported by Shandong government financial support (L37002013098) and Jinan government financial supporting (JK201303067 and 201305033). The authors are grateful to Prof. Xiaolin Wang from University of Wollongong for his valuable discussions and assistance in measurements.
© 2016, Springer-Verlag Berlin Heidelberg.
ASJC Scopus subject areas
- Chemistry (all)
- Materials Science (all)