Ultra-low frequency CPM of a-Si:H and relaxation

Comparison of AC and DC constant photocurrent methods for determination of defect densities

“…2 demonstrates the difference in response to squarewave excitation observed in our work, for super-and subgap excitation. Our explanation of the origin of this effect differs from that of Sl adek and Th eye and is similar to that stated by Hasegawa et al [2].…”

“…Discrepancies between the absorption spectrum in a-Si:H as obtained by DC-and AC-CPM methods have been noted by several groups [1][2][3]. The discrepancy lies in the 'defect' region of the spectrum, at photon energies E ph < 1:4 eV.…”

Peculiarity of constant photocurrent method for silicon films with mixed amorphous–nanocrystalline structure

“…It is known that CPM spectra may be influenced by transport and recombination processes. Discrepancies between the absorption spectrum in some of a-Si:H films obtained by DC and AC CPM have been noted by several groups [10][11][12]. The discrepancy is in the 'defect' region of the spectrum, at photon energies below 1.4 eV with the DC technique consistently giving a higher value.…”