TY - GEN
T1 - Photoluminescence and light-induced ESR in a-Si:H studied with subgap excitation
AU - Saleh, Rosari
AU - Ulber, Isabell
AU - Fuhs, Walther
PY - 1993
Y1 - 1993
N2 - We have studied the influence of the photon energy of the exciting light on the distribution of the carriers in the gap of a-Si:H by light-induced electron spin resonance (LESR) and photoluminescence (PL). In the LESR spectra the number of spins in the broad line (h) is larger than in the narrow line (e or e+db) by a factor of 2-3. For excitation in the bulk of the sample this asymmetry does not depend on the light intensity and photon energy, which suggests that it is not possible to relate the asymmetry to a specific defect structure. LESR and PL show that both bandtails can be populated by absorption of IR light (1060 nm) by optical transitions from occupied and into empty defect states. The recombination kinetics suggest that these absorption processes occur as a two-step process at the same defect.
AB - We have studied the influence of the photon energy of the exciting light on the distribution of the carriers in the gap of a-Si:H by light-induced electron spin resonance (LESR) and photoluminescence (PL). In the LESR spectra the number of spins in the broad line (h) is larger than in the narrow line (e or e+db) by a factor of 2-3. For excitation in the bulk of the sample this asymmetry does not depend on the light intensity and photon energy, which suggests that it is not possible to relate the asymmetry to a specific defect structure. LESR and PL show that both bandtails can be populated by absorption of IR light (1060 nm) by optical transitions from occupied and into empty defect states. The recombination kinetics suggest that these absorption processes occur as a two-step process at the same defect.
UR - http://www.scopus.com/inward/record.url?scp=0027872704&partnerID=8YFLogxK
U2 - 10.1557/proc-297-219
DO - 10.1557/proc-297-219
M3 - Conference contribution
AN - SCOPUS:0027872704
SN - 155899193X
SN - 9781558991934
T3 - Materials Research Society Symposium Proceedings
SP - 219
EP - 224
BT - Amorphous Silicon Technology
PB - Publ by Materials Research Society
T2 - Proceedings of the MRS Spring Meeting
Y2 - 13 April 1993 through 16 April 1993
ER -