Spectroscopic characterization of surfaces and interfaces of gallium-rich chalcopyrite solar cell absorbers with wet-chemical buffer layers

Autor*innen

• Victor van Maris

Parameter

• Chemie
• Naturwissenschaften

Mehr zum Buch

By adjusting the Ga/(Ga+In) ratio (GGI-ratio), the band gap can be varied, potentially increasing efficiency. However, previous attempts showed that increasing the GGI-ratio led to decreased efficiency. To address this, alternative buffer layers are explored alongside methods for better integration of the buffer layer deposition in an in-line production process. Dry techniques for buffer layer deposition lack the surface cleaning capabilities of wet CBD. UV-induced ozone and low-energy Ar+ ion treatments may offer effective dry surface cleaning steps for CIGSSe. The study investigates the chemical surface structure of a CIGSSe absorber and the diffusion across the interface between the buffer layer and absorber, which significantly impacts solar cell efficiency. This research examines potential diffusion for alternative buffer layers like In2S3 or ZnS (deposited by CBD) on Cu(In, Ga)Se2 with varying GGI-ratios. A combination of surface-sensitive spectroscopic methods, including laboratory-based x-ray photoelectron spectroscopy, x-ray-excited Auger electron spectroscopy, and ultraviolet photoelectron spectroscopy, along with synchrotron-based soft x-ray emission spectroscopy, is employed for this investigation.

• Sprache: Englisch
• Erscheinungsdatum: 2023