Title

Spectroscopic Analysis Of Cigs2/Cds Thin Film Solar Cell Heterojunctions On Stainless Steel Foil

Keywords

A. thin films; C. photoelectron spectroscopy; D. electronic structure

Abstract

This paper presents a spectroscopic analysis of the interface between a CuIn1-xGaxS2 (CIGS2) absorber and a CdS buffer layer on stainless steel foil by Auger electron spectroscopy (AES), inverse photoemission spectroscopy (IPES) and photoelectron spectroscopy (PES) such as X-ray photoelectron spectroscopy (XPS), and ultraviolet photoelectron spectroscopy (UPS). By combining these spectroscopic techniques, detailed information about the electronic and chemical properties of the CIGS2 surface and the CdS/CIGS2 interface can be obtained. The gallium concentration in CIGS2 films was found to increase continuously towards the Mo back contact. XPS analysis showed the presence of KCO3 on the surface of CdS, deposited on etched and un-oxidized samples indicating diffusion of potassium. No potassium was observed on oxidized as well as samples having thicker CdS (50 nm) indicating the effectiveness of oxidation and chemical bath deposition (CBD) process in cleaning the sample surface effectively. In addition, investigation of the electronic level alignment at the interface has been carried out by combining PES and IPES. Conduction band offset of -0.45 (±0.15) eV and a valence band offset of -1.06 (±0.15) eV were measured. These unfavorable conditions limit efficiency of CIGS2 thin film solar cells. © 2005 Elsevier Ltd. All rights reserved.

Publication Date

11-1-2005

Publication Title

Journal of Physics and Chemistry of Solids

Volume

66

Issue

11

Number of Pages

1872-1875

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

DOI Link

https://doi.org/10.1016/j.jpcs.2005.09.008

Socpus ID

29144516675 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/29144516675

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