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  Fehr, M.; Behrends, J.; Haas, S.; Rech, B.; Lips, K.; Schnegg, A.: Electrical detection of electron-spin-echo envelope modulations in thin-film silicon solar cells. Physical Review B 84 (2011), p. 193202/1-5

10.1103/PhysRevB.84.193202

Abstract:
Electrically detected electron-spin-echo envelope modulations (ED-ESEEM) were employed to detect hyperfine interactions between nuclear spins and paramagnetic sites, determining spin-dependent transport processes in multi-layer thin-film microcrystalline silicon solar cells. Electrical detection in combination with a modified Hahn-echo sequence was used to measure echo modulations induced by ²⁹Si, ³¹P and ¹H nuclei weakly coupled to electron spins of paramagnetic sites in the amorphous and microcrystalline solar cell layers. By combining these pieces of information with results from field-domain pulsed electrically detected magnetic resonance spectroscopy the microscopic origin of CE centers in μc-Si:H is investigated.