, IEEE J. Photovolt, vol.6, issue.1, pp.343-349, 2016.
, J. Phys. Appl. Phys, vol.45, issue.4, p.45101, 2012.
, Appl. Phys. Lett, vol.71, issue.25, pp.3667-3669, 1997.
, Appl. Phys. Lett, vol.88, issue.23, p.231103, 2006.
, J. Renew. Sustain. Energy, vol.6, issue.1, p.11203, 2014.