Patent ID: 8883549
Filing Date: 2014-11-11
Classification: H01L,Y02E

Abstract:
1. A method of doping a polycrystalline thin film photovoltaic material for a solar cell comprising: introducing a reactive oxidizer to the polycrystalline thin film photovoltaic material during thin film growth to create vacancies in the polycrystalline thin film photovoltaic material; and exposing the polycrystalline thin film photovoltaic material to a vacancy substitution agent after thin film growth to substitute defect complexes for the vacancies in the polycrystalline thin film photovoltaic material, the vacancy substituting agent being a chemical compound including an element present in the polycrystalline thin film photovoltaic material and a halogen; wherein the defect complexes are single acceptors formed from double acceptors compensated by single donors, the double acceptors being cadmium vacancies and the single donors being a halogen substitution of tellurium.