Photovoltaic device with luminescent layers of differing composition

Claim 2

A POTHOVOLTAIC DEVICE, COMPRISING A PHOTOVOLTAIC CELL OF THE JUNCTION DIODE TYPE WITH A LARGE SURFACE FOR RECEIVING RADIATION AND AT LEAST ONETHIN LAYER OF A LUMINESCENT SUBSTANCE OF THE AROMATIC FAMILY COATING SAD SURFACE, SAD SUBSTANCE BEING SO CHOSEN THAT THE RESPONSE TO SPECTRAL EXCITATION OF SAID SUBSTANCE IS, ON AN AVERAGE SUITATED LOWER, ON THE SCALE OF THE WAVELENGTHS, THAN THE ZONE OF SPECTRAL SENSITIVITY OF THE PHOTOVOLTAIC CELL ALONE.

Claim 3

A photovoltaic device as claimed in claim 1, wherein said photovoltaic cell is of the doped silicium type and wherein the layer directly applied on the photovoltaic cell is made of silicone resin impregnated with pentacene.

Claim 4

A photovoltaic device as claimed in claim 2, wherein a second thin layer is applied on the first layer directly applied on the photovoltaic cell, this second layer being made of silicone resin impregnated with naphtacene.

Claim 5

A photovoltaic device as claimed in claim 3, wherein a third thin layer is applied on the second layer, this third layer being made of silicone resin impregnated with anthracene.

Claim 6

A photovoltaic device as claimed in claim 4, wherein a fourth thin layer is applied on the third layer, this fourth layer being made of silicone resin impregnated with naphtalene.

Claim 7

A photovoltaic device as claimed in claim 5, wherein a fifth thin layer is applied on the fourth layer, this fifth layer being made of silicone resin impregnated with benzene.

Claim 8

A photovoltaic device, comprising a photovoltaic cell of the junction diode type with a large surface for receiving radiation and at least one thin layer of a luminescent substance coating said surface, said substance being so chosen that the response to spectral excitation of said substance is, on an average, situated lower, on the scale of the wavelengths, than the zone of spectral sensitivity of the photovoltaic cell alone, and a series of thin luminescent layers of different compositions applied on said photocell, the order of succession and the composition of the individual thin layers being selected in such a manner that the light energy in a spectrum zone of this light, falling on the outermost thin layer, is transferred successively in cascade, through the intermediary of the various layers interposed, up to the spectral sensitivity zone of said photovoltaic cell.

Claim 9

A photovoltaic device, comprising a photovoltaic cell of the junction diode type with a large surface for receiving radiation and at least one thin layer of a luminescent substance coating said surface, said substance being so chosen that the response to spectral excitation of said substance is, on an average, situated lower, on the scale of the wavelengths, than the zone of spectral sensitivity of the photovoltaic cell alone, and a series of thin luminescent layers of different compositions applied on said photocell, the order of succession and the composition of the individual thin layers being selected in such a manner that the light energy in a spectrum zone of this light, falling on the outermost thin layer, is transferred successively in cascade, through the intermediary of the various layers interposed, up to the spectral sensitivity zone of said photovoltaic cell.

Claim 10

A photovoltaic device as claimed in claim 7, wherein the thin layers are transparent for the light in the sensitivity spectrum of the photovoltaic cell.

Claim 11

A photovoltaic device as claimed in claim 7, comprising in addition an anti-reflecting layer on top of said thin layers.

Claim 12

A photovoltaic device as claimed in claim 7, the successive layers are made of substances having luminescence properties, which are cyclic derivatives of aromatic elements.