Measurements of high temperature conductivity on a-Si:H obtained by LPCVD from Si2H6 at temperatures between 450 and 500 °C indicate clearly a change on the activation energy from 0.9–1.0 eV to 0.55–0.6 eV around 600 °K.
The results are not strongly different from those obtained in GD a-SiH4:however, the coefficent of the energy shift of the mobility edge with temperature is greater by a factor of 2, while the average extension of the tail state distribution at T= 0 °K is roughly a factor 1.5 larger. The main discrepancy concerns the pre-exponential factor, which is one or two orders of magnitude larger, giving a product (NcukT) of the order of 1021 cm−1 V−1 s−1. By assuming a conduction mobility two orders of magnitude larger than the maesured Hall mobility one obtains a value for N which is only a factor four times larger than what currently assumed for a-Si:H.
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Manfredotti, C., Gervino, G., Montaldi, L. et al. Transport Measurements in LPCVD Amorphous Silicon Obtained from Disilane. MRS Online Proceedings Library 70, 179–184 (1986). https://doi.org/10.1557/PROC-70-179