Deliberate and Accidental Gas-Phase Alkali Doping of Chalcogenide Semiconductors: Cu(In,Ga)Se₂.

ABSTRACT: Alkali metal doping is essential to achieve highly efficient energy conversion in Cu(In,Ga)Se₂ (CIGSe) solar cells. Doping is normally achieved through solid state reactions, but recent observations of gas-phase alkali transport in the kesterite sulfide (Cu₂ZnSnS₄) system (re)open the way to a novel gas-phase doping strategy. However, the current understanding of gas-phase alkali transport is very limited. This work (i) shows that CIGSe device efficiency can be improved from 2% to 8% by gas-phase sodium incorporation alone, (ii) identifies the most likely routes for gas-phase alkali transport based on mass spectrometric studies, (iii) provides thermochemical computations to rationalize the observations and (iv) critically discusses the subject literature wi

SUBMITTER: Colombara D 

PROVIDER: S-EPMC5324121 | biostudies-literature | 2017 Feb

REPOSITORIES: biostudies-literature