Pr oceed in gs o f t he XXX I I n t ern at io n al Sch oo l o f Sem icond uct i ng Co m p ou n ds, Ja szo wi ec 200 2 T h e H 2 M ole cu le in Sem icon d u cto r s: An An gel in G aAs , a De v il in Si S.K. E st r eic he r P h ysi cs D ep art m ent , T exa s T ech Uni versi ty , L u bb ock T X 79 409, U SA T h e electr ic al and optical prop ertie s of semicond uctors are lar gely determined by the def ects and impuriti es they contain . Without a doubt , hydrogen is the impurity w hich exhibi

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... s the most varied and exotic prop erties. I n most semiconductors , it is found in three charge states and four con Ùgurations. I t forms (at least ) tw o typ es of dimers as well as small and large precipitates such as platelets. H also interacts w ith impurities and def ects.