SOLAR CELL AND METHOD FOR PRODUCING SAME
First Claim
1. A method for fabricating a rear contacted heterojunction intrinsic thin layer solar cell wherein the rear side is formed by at least:
- providing a silicon substrate with a front surface and a rear surface;
depositing a continuous thin layer of intrinsic amorphous silicon over the entire rear surface of the silicon substrate, the intrinsic amorphous silicon layer having a front surface adjacent to the rear surface of the silicon substrate and the intrinsic amorphous silicon layer having a back surface opposite to the front surface of the intrinsic amorphous silicon layer;
depositing a separation layer comprising an electrically insulating material wherein the separation layer is deposited through a mask such that it covers separation portions of the back surface of the intrinsic amorphous silicon layer;
depositing an emitter layer comprising a doped semiconducting material of a first doping polarity wherein the emitter layer is deposited through a mask such that it covers an emitter portion of the back surface of the intrinsic amorphous silicon layer adjacent to the separation portions;
depositing a base layer comprising a doped semiconducting material of a second doping polarity opposite to the first doping polarity and with higher doping concentration than the silicon substrate wherein the base layer is deposited though a mask such that it covers a base portion of the back surface of the intrinsic amorphous silicon layer adjacent to the separation portions.
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Abstract
A rear contact heterojunction solar cell and a fabricating method. The solar cell comprises a silicon substrate having a passivating layer and an intrinsic amorphous silicon layer. At a back side of the intrinsic amorphous silicon layer, an emitter layer and a base layer are provided. Interposed between these emitter and base layers is a separation layer comprising an electrically insulating material. This separation layer as well as the base layer and emitter layer may be generated by vapour deposition. Due to such processing, adjacent regions of the emitter layer and the separating layer and adjacent regions of the base layer and the separating layer partially laterally overlap in overlapping areas in such a way that at least a part of the separating layer is located closer to the substrate than an overlapping portion of the respective one of the emitter layer and the base layer.
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Citations
14 Claims
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1. A method for fabricating a rear contacted heterojunction intrinsic thin layer solar cell wherein the rear side is formed by at least:
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providing a silicon substrate with a front surface and a rear surface; depositing a continuous thin layer of intrinsic amorphous silicon over the entire rear surface of the silicon substrate, the intrinsic amorphous silicon layer having a front surface adjacent to the rear surface of the silicon substrate and the intrinsic amorphous silicon layer having a back surface opposite to the front surface of the intrinsic amorphous silicon layer; depositing a separation layer comprising an electrically insulating material wherein the separation layer is deposited through a mask such that it covers separation portions of the back surface of the intrinsic amorphous silicon layer; depositing an emitter layer comprising a doped semiconducting material of a first doping polarity wherein the emitter layer is deposited through a mask such that it covers an emitter portion of the back surface of the intrinsic amorphous silicon layer adjacent to the separation portions; depositing a base layer comprising a doped semiconducting material of a second doping polarity opposite to the first doping polarity and with higher doping concentration than the silicon substrate wherein the base layer is deposited though a mask such that it covers a base portion of the back surface of the intrinsic amorphous silicon layer adjacent to the separation portions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification