Effect of a Mo back contact on Na diffusion in CIGS thin film solar cells

Ju Heon Yoon, Tae Yeon Seong, Jeung Hyun Jeong

Research output: Contribution to journalArticle

56 Citations (Scopus)

Abstract

We investigated the effects of the microstructures of molybdenum (Mo) back contacts on sodium (Na) diffusion from sodalime glass into a Cu(In,Ga)Se 2 (CIGS) absorber as a function of the sputter deposition pressure during preparation of the Mo contact layer. The surface characteristics of the Mo layers more significantly affected the diffusion of Na ions into the CIGS compared with the Mo bulk. The Na ion diffusion depended strongly on the amount of oxygen adsorbed onto the Mo layer surfaces. Secondary ion mass spectroscopy results showed that Na accumulated in a layer (Na-O compound) on the Mo surface (the CIGS/Mo interface), and this layer served as a primary source of Na ions diffusing into the CIGS. A trilayered Mo back contact structure was prepared in an effort to decouple the functions of electrical conductance and Na diffusion. The ability of this surface to control the Na concentration in a CIGS absorber is discussed.

Original languageEnglish
Pages (from-to)58-63
Number of pages6
JournalProgress in Photovoltaics: Research and Applications
Volume21
Issue number1
DOIs
Publication statusPublished - 2013 Jan 1

Fingerprint

Molybdenum
molybdenum
solar cells
thin films
Ions
absorbers
ions
Sputter deposition
Thin film solar cells
electric contacts
surface layers
mass spectroscopy
Sodium
sodium
Spectroscopy
Oxygen
Glass
preparation
microstructure
Microstructure

Keywords

  • CIGS solar cell
  • Mo back contact
  • Na diffusion
  • Na-O compound

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Effect of a Mo back contact on Na diffusion in CIGS thin film solar cells. / Yoon, Ju Heon; Seong, Tae Yeon; Jeong, Jeung Hyun.

In: Progress in Photovoltaics: Research and Applications, Vol. 21, No. 1, 01.01.2013, p. 58-63.

Research output: Contribution to journalArticle

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