Tobias Törndahl

TL;DR: In this paper, a review on the recent work concerning Cd-free buffer and window layers in chalcopyrite solar cells using various deposition techniques as well as their adaptation to chal copyrite-type absorbers such as Cu(In,Ga)Se-2, CuInS2, or Cu(in,Ga)(S,Se)(2).

TL;DR: In this paper, thin film solar cells with the structure sodalimeglass were studied for varying thickness and sulfur content of the Zn(O,S) buffer layer, and two different deposition recipes were found to yield devices with efficiencies equal to or above reference devices in which standard CdS buffer layers were used.

TL;DR: Photoelectron spectroscopy, optical characterization, and density functional calculations of ZnO1-xSx reveal that the valence-band (VB) offset E(v)( x) increases strongly for small S content, whereas the conduction-band edge E(c)(x) increases only weakly.

TL;DR: In this paper, the co-evaporation of Cu(In,Ga)Se2 (CIGS) in an inline single-stage process is used to fabricate solar cell devices with up to 18.6% conversion efficiency using a CdS buffer layer and 18.2% using a Zn1-xSnxOy Cd-free buffer layer.

TL;DR: In this paper, the shift in the valence and conduction bands of ZnO-S is shown to be nonlinear with respect to the sulfur content, resulting in a large band gap bowing.