Batteries: thermoelectric and photoelectric – Photoelectric – Cells
Reexamination Certificate
2004-06-17
2010-02-09
Ridley, Basia (Department: 1795)
Batteries: thermoelectric and photoelectric
Photoelectric
Cells
C136S251000, C136S258000, C136S259000, C136S261000, C257S433000, C257S788000, C257SE21266, C257SE21268, C257SE21271, C257SE21280, C257SE21290, C428S457000, C438S038000
Reexamination Certificate
active
07659475
ABSTRACT:
The present invention provides a method for dielectric passivating the surface of a solar cell by accumulation of negative fixed charges of a first type at the interface between semiconductor material and a passivating material. According to the invention the passivating material comprises an oxide system, for example a binary oxide system, comprising Al2O3and at least one metal oxide or metalloid oxide which enhances the tetrahedral structure of Al2O3, for example, an (Al2O3)x(TiO2)1-xalloy. In this way it is possible to combine the desirable properties from at least two different oxides, while eliminating the undesirable properties of each individual material. The oxide system can be deposited onto the semiconductor surface by means of a sol-gel method, comprising the steps of formation of the metal oxide and/or metalloid oxide sol and the aluminum solution and then carefully mixing these together under stirring and ultrasonic treatment. Thin films of the oxide system can then be deposited onto the semiconductor surface by means of spin coating followed by a temperature treatment.
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Agostinelli Guido
Harizanova Antoaneta
Szlufcik Jozef
Vitanov Petko
IMEC
Knobbe Martens Olson & Bear LLP
Ridley Basia
Trinh Thanh-Truc
LandOfFree
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