Ym. Hua et al., OPTICAL 2ND-HARMONIC REFLECTION FROM POLYCRYSTALLINE SILICON AND ITS RELATION TO GRAIN-BOUNDARIES, Applied physics letters, 64(10), 1994, pp. 1277-1279
Grain boundary contributions to optical second-harmonic generation giv
e rise to an unusually high reflected second-harmonic intensity from p
olycrystalline silicon. At the grain boundaries, the dangling bonds af
fect the second order nonlinear susceptibility via the electric dipole
contribution. The second-harmonic signal dependence on dangling bonds
passivation by hydrogen is experimentally observed to support the gra
in boundary model.