| (11) | EP 2 530 722 A3 |
(12) | EUROPEAN PATENT APPLICATION |
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(54) | Refractive index matching of thin film layers for photovoltaic devices and methods of their manufacture |
(57) Thin film photovoltaic devices (10) are generally provided. In one embodiment, the device (10) includes a high index layer (11) (e.g., having a refractive index of about 2 or more) on a glass substrate (12) and a low index layer (13) (e.g., having a refractive index of about 1.5 or less) on the high index layer (11). A transparent conductive oxide layer (14) is positioned on the low index layer (13), and a photovoltaic heterojunction (e.g., a cadmium sulfide layer (18) and a cadmium telluride layer (20)) is positioned on the transparent conductive oxide layer (14). In an alternative embodiment, the device (10) can include the low index layer (13) on the glass substrate (12) and the high index layer (11) on the low index layer (13). Methods are also generally provided for manufacturing such thin film photovoltaic devices (10).
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