Table 1
The fundamental (Eg), direct (
, and Γ-point (
gap energies, as well as the high-frequency
dielectric constant (ε∞); we present the average
dielectric constant since the anisotropy is rather small. The maximum solar conversion
efficiency (ηmax) is
presented for two film thicknesses (d), and it includes both radiative and Auger
recombinations (values in parenthesis are results when the Auger effect is neglected).
| Compound | x | Gap energies [eV] | ε∞ | ηmax [%] | ||||
| Eg |  |
 |
 |
d = 200 nm | 50 nm | |||
CuSb(Se1−xTe |
0.00 | 1.21 | 1.43 | 1.55 | 1.09a, 1.2b | 13.0 | 25.1 (28.5) | 19.8 (22.4) |
| 0.25 | 1.15 | 1.31 | 1.44 | 13.9 | 26.1 (28.1) | 20.9 (22.4) | ||
| 0.50 | 1.03 | 1.25 | 1.25 | 15.5 | 26.2 (30.3) | 22.3 (25.6) | ||
| 0.75 | 0.91 | 1.02 | 1.33 | 17.2 | 28.3 (29.8) | 23.8 (25.0) | ||
| 1.00 | 0.87 | 1.07 | 1.23 | 17.2 | 24.7 (29.8) | 21.0 (25.2) | ||
| CuBi(S1−xSe |
0.00 | 1.30 | 1.57 | 2.03 | 1.65c | 10.5 | 20.3 (24.1) | 15.1 (17.8) |
| 0.25 | 1.17 | 1.44 | 1.87 | 11.0 | 21.0 (25.5) | 15.5 (18.7) | ||
| 0.50 | 1.22 | 1.45 | 1.80 | 11.6 | 23.4 (27.0) | 18.2 (20.9) | ||
| 0.75 | 1.09 | 1.30 | 1.66 | 12.3 | 24.2 (28.2) | 19.0 (22.1) | ||
| 1.00 | 1.07 | 1.26 | 1.58 | 12.7 | 24.3 (27.4) | 19.1 (21.5) | ||
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