1. Arya, R.R., A. Catalano, and R.S. Oswald, Amorphous silicon p-i-n solar cells with graded interface, Appl. Phys. Lett. 49 (1986) 1089–1091.
2. Arya, R.R., R.S. Oswald, Y.M. Li, N. Maley, K. Jansen, L. Yang, L.F. Chen, F. Willig, M.S. Bennet, J. Morris, and D.E. Carlson, Progress in amorphous silicon based multijunction modules, 1st World Conference on Photovoltaic Energy Conversion, (Proc. 24th IEEE PV Specialists Conference, Waikoloa, HI, USA, December 1994) 394–400.
3. Ashida, Y., Single-junction a-Si solar cells with over 13 % efficiency, Techn. Digest of the International PVSEC-7, Nagoya, Japan, 1993, 33–36.
4. Banerjee, A., and S. Guha, Study of back reflectors for amorphous silicon alloy solar cell application, J. Appl. Phys. 69 (1991) 1030–1035.
5. Beneking, C., B. Rech, Th. Eickhoff, Y.G. Michael, N. Schultz, and H. Wagner, Preparation and light stability of a-Si/a-Si stacked solar cells, 12th International E.C. Photovoltaic Solar Energy Conference 1994, Eds. R. Hill, W. Palz, and P. Helm (H.S. Stephens and Associates, 1994) 683–686.