Photocharge Transport and Recombination Measurements in Amorphous Silicon Films and Solar Cells by Photoconductive Frequency Mixing: Annual Subcontract Report, 20 April 1999 - 19 April 2000 Page: 11 of 41
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compensation, result in a shift of Ef towards Ee and accordingly an increase of the
electron mobility.
Photomixing Measurements on samples supplied by Guanglin Kong
The sample properties are given in Table I.
Table 1. Deposition conditions
Sample SiH4:H2 ingredient Tsubstr. Tdep Thickness Deposition
ID (C) (hrs) ([m) Rate (/s)
170426 1:1 360 4.5 1.5 0.93
180929 1:3 300 3.5 3 2.40
P 60715 I 1:12 0.2% B2H6(104) 225 3.0 0.89 0.82
P 60717 11 1:12 2% B2H6 10~4 225 2.6 0.79 0.84
G 179 1:5 350 1.5 1.25 2.31
G 202 1:5 400 4.0 1.7 1.18
G 203 1:5 300 5.0 3.2 1.78
G204 1:5 200 3.0 2.2 2.04
As shown in Table 1, a series of four samples, G179 - G204, is prepared with the
substrate temperature being varied at constant dilution ratio. The respective light-induced
decay curves are shown in figures 1 and 2 beginning with the highest substrate
temperature. For all samples, the mobility after three hours of illumination lies
somewhere between 50% and 60% of the initial value. The lifetime decay, however,
seems to scale with the deposition temperature, i.e. the lower the deposition temperature
the lower the final lifetime with respect to the initial value. Also the initial photomixing
mobility is clearly higher for films deposited with higher Ts. For the photoconductivity
this means that for lower deposition temperatures (Ts < 350 C) both the initial value (due
to the lower initial mobility) and the decay rate (due to the higher decay of the lifetime)
turn out to be rather poor as compared to samples with Ts > 350 C. It seems that given a
moderate dilution ratio the network reconstruction during growth requires more
activation through the substrate temperature than, e.g. in the case of Hot-Wire CVD.
From this series it is clear that the best sample is also the most expensive one in terms of
substrate temperature and deposition rate.
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Braunstein, R.; Kathwinkel, A. & Sheng, S. R. (University of California/Los Angeles). Photocharge Transport and Recombination Measurements in Amorphous Silicon Films and Solar Cells by Photoconductive Frequency Mixing: Annual Subcontract Report, 20 April 1999 - 19 April 2000, report, August 29, 2001; Golden, Colorado. (https://digital.library.unt.edu/ark:/67531/metadc717126/m1/11/: accessed May 7, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.