Asulab S.a.

Yvan Ziegler

Eric Saurer

Diego Fischer

Ren&eacute; Viennet

There is described a colored photovoltaic cell ( ) with a semiconductor, preferably silicon, which has high efficiency and a pleasing colored appearance, allowing it to be used as a dial for a watch or another electronic apparatus powered by the cell. The cell includes a reflective metal substrate ( ) serving as the bottom electrode, a stack of hydrogenated amorphous silicon layers forming p-i-n junctions ( ), and a transparent top electrode ( ). The latter may be coated with a layer ( ) of slightly diffusing lacquer, which may be colorless or colored. The respective thicknesses e of the top electrode and e of the silicon are combined as a function of the refractive indices of the materials so as to produce an interferential reflection in a predetermined reflection spectrum.

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Villiers, Switzerland

Yvan Ziegler