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Wavelength dependence of optimum thickness of Cs–O low‐work‐function surfaces
1.H. Sonnenberg, Appl. Phys. Letters 19, 431 (1971).
2.A monolayer of Cs is defined here as the amount of Cs required to optimize the photoresponse at 6328 Å with Cs alone. For GaAs, S. Garbe [Solid‐State Electron. 12, 893 (1969)] measured for optimum Cs coverage,
2.and J. J. Uebbing and L. W. James [J. Appl. Phys. 41, 4505 (1970)] measured Giving equal weight to these measurements, we determine a mean‐optimum Cs coverage of This is equivalent (within experimental accuracy) to one monolayer of Cs since there are unit cells on the surface.
3.We assume that the Cs and sticking coefficients do not change significantly with coverage.
4.The fact that T is greater than 1 shows that some is required to optimize the photoresponse at all wavelengths, including the ultraviolet range.
5.Note that the efficiency at 1.3 μ is almost 0. 02%. Further improvement with better material can be expected.
6.If we make the same assumptions about the Cs‐O surface that were made in Ref. 1, we find that the low‐work‐function surface consists of approximately one monolayer of Cs and 1. 7 monolayers of
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