Abstract
Solar cells based on hydrogenated amorphous silicon are now made from a variety of materials including alloys and microcrystalline films. Research aimed at improving cell efficiency should emphasize studies of alloys and metastable defects. We discuss several research topics related to the growth, structure, and electronic properties of these materials, which should lead to improved photovoltaic devices.
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N.M. Johnson, C.E. Nebel, P.V. Santos, W.B. Jackson, R.A. Street, U.S. Stevens and J. Walker,Appl. Phys. Lett. 59, 1443 (1991).
A.H. Mahan, B.P. Nelson, S. Salamon and R.S. Crandall,J. Non-Cryst. Solids 137-138, 657 (1991).
H. Shirai, J. Hanna and I. Shimizu,MRS Symp. Proc. 219, 643 (1991).
Y. S. Tsuo et al.,Proc. Mat. Res. Soc. 219, 769 (1991).
Presented by the Princeton group at 1992 Spring MRS meeting in San Francisco.
K. D. Mackenzie et al.,Phys. Rev. B31, 2198(1985);Phys. Rev., B38, 6120 (1988).
S. Aljishi, Z.E. Smith and S. Wagner,Amorphous Silicon and Related Materials B (World Scientific 1989, H. Fritzsche, ed.) p. 887.
We are short-changing a full discussion of the hole transport, which must not be taken to simply follow our remarks for electrons.
For brevity, we dodge the question that the fact of alloying may produce dangling-bond or other defects at different energies w.r.t. the Fermi level, so that charged centers creating potential fluctuations exist. In fact, this is a very real difficulty.
NREL/TP-410-4724 Report for FY 1991 of the NREL, Section on Colorado School of Mines, p. 20.
L. Yang et al.,Proc. Mat. Res. Soc. 149, 497 (1989).
M. B. Schubert et al.,Proc. Mat. Res. Soc. 192, 121 (1990).
L. Yang et al.,Proc. Mat. Res. Soc. 219, 157 (1990).
J. Wind et al.,J. Non-Cryst. Solids 114, 531 (1989).
C. M. Fortmann,Proc. Mat Res. Soc. 118, 691 (1988). AlsoProc. Mat. Res. Soc. 192, 127 (1990).
Referring to a sharp mobility edge is a convenience. It is easy to imagine a similar outcome (an activated mobility) if the mobility varies rapidly but continuously with energy.
J. A. Howard and R. A. Street,Phys. Rev. B 44, 7935 (1991).
F. Evangelisti,J. Non-Cryst. Solids 77/78, 969 (1985). It should be noted, however, that there is disagreement in the literature concerning these conclusions. See L. Chahed et al.,J. Non-Cryst. Solids 114, 471 (1989).
S. Aljishi et al.,Proc. Mat. Res. Soc. 192, 157 (1990).
R. A. Street,Solar Cells 24, 211 (1989); R. A. Street,Phys. Rev. B44, 10610 (1991).
K. Hattori et al.,Amorphous Silicon and Related Materials, B (World Scientific, 1989, H. Fritzsche, ed.) p. 957.
S. Aljishi, J.D. Cohen, S. Tin and L. Ley,Mat. Res. Soc. Symp. Proc. 192, 157 (1990).
F. Evangelisti,J. Non-Cryst. Solids 77-78, 969 (1985).
X.-R. Li, Ph.D. Thesis, Princeton University (1992).
N. Hata, M. Isomura and S. Wagner,Appl. Phys. Lett. 60, 1462 (1992).
M. Stutzmann, W. B. Jackson and L. C. Tsai.MRS Symp. Proc. 49, 301(1985).
T. Unold and J. D. Cohen,MRS Symp. Proc. 192, 719 (1990).
J.W. Park, R.J. Schwartz, J.L. Gray and G.B. Turner, Conf. Rec. 20th IEEE Photovoltaic Specialists Conf., Las Vegas, Sept. 26–30, p. 55, New York (1988).
J.K. Arch, F.A. Rubinelli, J.Y. Hou and S.J. Fonash,J. Appl. Phys. 69, 7057 (1991).
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Paul, W., Street, R.A. & Wagner, S. Hydrogenated amorphous semiconductors. J. Electron. Mater. 22, 39–48 (1993). https://doi.org/10.1007/BF02665722
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DOI: https://doi.org/10.1007/BF02665722