ELECTRIC-DIPOLE SPIN-RESONANCE OF GRAIN-BOUNDARIES IN MULTICRYSTALLINE SILICON

An electrically induced electron paramagnetic resonance signal is repo rted, which is observed at grain boundaries of multicrystalline solar silicon. The characteristic properties are a phase shift of 180-degree s relative to the P0 signal and a superlinear increase of the intensit y with microwave power. These properties can be qualitatively explaine d by a model of Koshelev et al., which was developed for conducting di slocations. This signal is considered to be the evidence for electrica l conductivity of grain boundaries at low temperatures (20 K).