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(11)    Patent No :    AP 2149    (73) Applicant(s)       
(21)    Application No :    AP/P/2006/003508    UNIVERSITY OF JOHANNESBURG, Cnr. Kingsway and       
            University Roads, Auckland Park, Johannesburg, 2006,       
                   
(22)    Filing Date :    13.08.2004    South Africa       
(24)    Date of Grant &    01.09.2010           
                   
(45)    Publication :

(30)    Priority Data            (72) Inventors   
    (33) Country    (31) Number    (32) Date    ALBERTS Vivian, South Africa   
    ZA    2003/6316    14.08.2003           
    ZA    2004/2497    30.03.2004    (74) Representative   
(84)    Designated State           
    BW  GH   NA            HONEY & BLANCKENBERG   
                   
(51)    International    Classification    H01L31/032 (2006.01)    H01L31/18 (2006.01)   


(54)    Title

Method for the preparation of group  IB-IIIA-VIA quaternary or higher alloy semiconductor films

(57)    Abstract

This invention relates to a method for producing group IB-IIIA-VIA quaternary

or higher alloy semiconductor films wherein the method comprises the steps of (i) providing a metal film comprising a mixture of group IB and group IIIA metals; (ii) heat treating the metal film in the presence of a source of a first group VIA element (said first group VIA element hereinafter being referred to as VIA1, ) under conditions to form a first film comprising a mixture of at least

one binary alloy selected from the group consisting of a group IB -VIA1, alloy and a group IIIA-VIA1 alloy and at least one group IB-IIIA-VIA1 ternary alloy (iii) optionally heat treating the first film in the presence of a source of a second group VIA element (said second group VI element hereinafter being referred to as VIA2) under conditions to convert the first film into a second film comprising at least one alloy selected from the group consisting of a group IB-VIA1-VJA2 alloy and a group III A - VIA1- VIA2 alloy; and the at least one group IB-III-VIA1 ternary alloy of step (ii): (iv) heat treating either

(56)    Documents Cited :    Nagoya Y et al    Kushiya K et al

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