Enhanced efficiency of CdTe Photovoltaic by thermal evaporation Vacuum

Abstract

CdTe Cadmium telluride is a hopeful material for large scale photovoltaic applications. This paper we study effect annealing temperature( 200, 400) for CdTe heterojunction solar cells with thermal evaporation technique in vacuum with rate deposition (4.32 A°/sec) and thickness ( ≈ 400 ±10 nm), solar cells were realization with conversion efficiencies of ( 6.4% - 10.8%). The main focus in this work was to study the annealing temperature dependent conduct of the expansion parameter and the band gap energy of (CdTe ) thin film in solar cells. Room temperature band gap for ( CdTe) is found ( Eg =1.5 to 2) eV for efficiency solar cells.