Patent ID: 7901975
Filing Date: 2011-03-08
Classification: H01L,Y02E,Y02P

Abstract:
1. A method for fabricating a heterojunction photovoltaic device including three p-type absorber layers in contiguous contact, each of the three absorber layers having a different composition and containing cadmium as a principal constituent, the method comprising the steps of: (a) providing an optically transparent substrate coated with a transparent conductive oxide layer thereon; (b) depositing an n-type window layer onto said transparent conductive oxide layer by sputter deposition; (c) depositing a first p-type absorber layer onto said window layer by sputter deposition; (d) depositing a second p-type absorber layer onto said first absorber layer; (e) depositing a third p-type absorber layer onto said second absorber layer by sputter deposition; (f) depositing a CdCl (g) annealing said CdCl wherein said second p-type absorber layer is formed of CdTe, said third p-type absorber layer is formed of Cd