Abstract
The Seebeck coefficient and dark conductivity for undoped, and n-type doped thin film hydrogenated amorphous silicon (a-Si:H), and mixed-phase films with silicon nanocrystalline inclusions (a/nc-Si:H) are reported. For both undoped a-Si:H and undoped a/nc-Si:H films, the dark conductivity is enhanced by the addition of silicon nanocrystals. The thermopower of the undoped a/nc-Si:H has a lower Seebeck coefficient, and similar temperature dependence, to that observed for undoped a-Si:H. In contrast, the addition of nanoparticles in doped a/nc-Si:H thin films leads to a negative Seebeck coefficient (consistent with n-type doping) with a positive temperature dependence, that is, the Seebeck coefficient becomes larger at higher temperatures. The temperature dependence of the thermopower of the doped a/nc-Si:H is similar to that observed in unhydrogenated a-Si grown by sputtering or following high-temperature annealing of a-Si:H, suggesting that charge transport may occur via hopping in these materials.
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References
D.K.C. MacDonald, Thermoelectricity: An introduction to the principles,Wiley,New York,1962.
Y. Adjallah, C. Anderson, U. Kortshagen, J. Kakalios, J. Appl. Phys. 107 043704 (2010).
C. Blackwell, X. Pi, U. Kortshagen, J. Kakalios, Mat. Res. Soc. symp. 1066 155–160 (2008).
Harold Dyalsingh. Thermoelectric Effects in Amorphous Silicon. PhD dissertation. (1996).
H. Dyalsingh, J. Kakalios Physical Review B. 54 7630–7633 (1996).
H. Overhof, W. Beyer. Phil. Mag. B 47 377–92 (1983).
R. Fletcher, V.M. Pudalov, A.D.B. Radcliffe, C. Possanzini, Semicond. Sci. Technol. 16 386–393 (2001).
D.L. Staebler, C.R. Wronski, Appl. Phys. Lett. 31 292 (1977).
D.L. Staebler, C.R. Wronski, J. Appl. Phys. 51 3262 (1980).
R. Meaudre, M. Meaudre, R. Butté, S. Vignoli,Thin Solid Films 366 207–210 (2000).
D. Emin, C. H. Seager, R. K. Quinn, Phys. Rev. Lett. 28 813–816 (1972).
C. H. Seager, D. Emin, R.K. Quinn, J. Non Cryst. Solids. 8–10 341–346 (1972).
R.A. Street, Hydrogenated Amorphous Silicon, Cambridge University Press, Cambridge England, 1991.
D. Monroe, Band-edge conduction in Amorphous Semiconductors, (1987).
A. H. Mahan and M. Vanecek, International Meeting on Stability of Amorphous Silicon Materials and Solar Cells, 234, 195 (1991).
D. Kwon, J. D. Cohen, B. P. Nelson, and E. Iwaniczko, Mat. Res. Soc., 377, 301 (1995).
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Adjallah, Y., Blackwell, C. & Kakalios, J. Thermoelectric properties of doped and undoped mixed phase hydrogenated amorphous/nanocrystalline silicon thin films. MRS Online Proceedings Library 1245, 1710 (2009). https://doi.org/10.1557/PROC-1245-A17-10
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DOI: https://doi.org/10.1557/PROC-1245-A17-10