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Sub-Bandgap Optical Absorption in Amorphous Silicon using Photo-Pyroelectric Spectroscopy

  • J. Fan (a1) and J. Kakalios (a1)


Measurements of the optical absorption spectrum of doped and undoped hydrogenated amorphous silicon (a-Si:H) for photon energies ranging from 0.8 to 2.5 eV are obtained using photo-pyroelectric spectroscopy (PPES). This technique, based upon the pyroelectric effect, has a simpler experimental set-up than photo-thermal deflection spectroscopy, and presently has a sensitivity of ad > 10-3, where d is the sample thickness. In addition, using PPES we have measured the non-radiative quantum efficiency in a-Si:H, and find that it has a strong wavelength dependence for sub-bandgap illumination.



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1. Jackson, W. B., Amer, N. M., Boccara, A. C. and Fournier, D., Appl. Optics 20, 1333 (1981).
2. Coufal, H. J., Appl. Phys. Lett. 44, 59 (1984); Appl. Phys. Lett. 45, 516 (1984).
3. Tanaka, K., Ichimura, Y. and Sindoh, K., J. Appl. Phys. 63, 1815 (1988).
4. Coufal, H. J., Grygier, R. K., Home, D. E. and Fromm, J. E., J. Vac. Sci. Tech. A 5, 2875 (1987).
5. Mandelis, A., Wagner, R. E., Ghandi, K., Baltman, R. and Dao, P., Phys. Rev. B 39, 5254 (1989).
6. PVDF KynarR film available from Penwalt Corp., Piezo Film Dept., P.O. Box 799, Valley Forge, PA 19482.
7. Jackson, W. B. and Amer, N. M., Phys. Rev. B 25, 5559 (1982).
8. Street, R. A., Phys. Rev. Lett. 49, 1187 (1982).
9. Amer, N. M. and Jackson, W. B., Semiconductors and Semimetals, ed. by Pankove, J. I. (Academic Press, Orlando, FL) 21B, 94 (1984).
10. Fan, J. and Kakalios, J., to be published.
11. Gu, S. and Taylor, P. C., private communication.


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