Crystallization and surface segregation in CuIn0.7Ga 0.3Se2 thin films on Cu foils grown by pulsed laser deposition

Yeon Hwa Jo, Bhaskar Chandra Mohanty, Yong Soo Cho

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

This work reports unexpected crystallization and segregation behavior of CuIn0.7Ga0.3Se2 (CIGS) thin films deposited on flexible Cu foils by pulsed laser deposition. A composite-type microstructure containing nanometer-scaled CIGS crystallites embedded in amorphous Cu-rich matrix is observed even at the high temperature of 500 °C. The findings are attributed to very fast condensation of the ablated species and random nucleation induced from the amorphous matrix. Cu-rich particulates tend to precipitate on the film surface, and their average size, shape, number density and composition exhibit a strong dependence on the substrate temperature up to 500 °C. The similar crystallization properties of the films on Cu foils and glass substrates are noticeable to the use of Cu foils for flexible solar cells.

Original languageEnglish
Pages (from-to)6819-6823
Number of pages5
JournalApplied Surface Science
Volume256
Issue number22
DOIs
Publication statusPublished - 2010 Sep 1

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Surface segregation
Pulsed laser deposition
Crystallization
Metal foil
Thin films
Substrates
Crystallites
Precipitates
Condensation
Solar cells
Nucleation
Glass
Temperature
Microstructure
Composite materials
Chemical analysis

All Science Journal Classification (ASJC) codes

  • Surfaces, Coatings and Films

Cite this

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title = "Crystallization and surface segregation in CuIn0.7Ga 0.3Se2 thin films on Cu foils grown by pulsed laser deposition",
abstract = "This work reports unexpected crystallization and segregation behavior of CuIn0.7Ga0.3Se2 (CIGS) thin films deposited on flexible Cu foils by pulsed laser deposition. A composite-type microstructure containing nanometer-scaled CIGS crystallites embedded in amorphous Cu-rich matrix is observed even at the high temperature of 500 °C. The findings are attributed to very fast condensation of the ablated species and random nucleation induced from the amorphous matrix. Cu-rich particulates tend to precipitate on the film surface, and their average size, shape, number density and composition exhibit a strong dependence on the substrate temperature up to 500 °C. The similar crystallization properties of the films on Cu foils and glass substrates are noticeable to the use of Cu foils for flexible solar cells.",
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Crystallization and surface segregation in CuIn0.7Ga 0.3Se2 thin films on Cu foils grown by pulsed laser deposition. / Jo, Yeon Hwa; Mohanty, Bhaskar Chandra; Cho, Yong Soo.

In: Applied Surface Science, Vol. 256, No. 22, 01.09.2010, p. 6819-6823.

Research output: Contribution to journalArticle

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AU - Mohanty, Bhaskar Chandra

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AB - This work reports unexpected crystallization and segregation behavior of CuIn0.7Ga0.3Se2 (CIGS) thin films deposited on flexible Cu foils by pulsed laser deposition. A composite-type microstructure containing nanometer-scaled CIGS crystallites embedded in amorphous Cu-rich matrix is observed even at the high temperature of 500 °C. The findings are attributed to very fast condensation of the ablated species and random nucleation induced from the amorphous matrix. Cu-rich particulates tend to precipitate on the film surface, and their average size, shape, number density and composition exhibit a strong dependence on the substrate temperature up to 500 °C. The similar crystallization properties of the films on Cu foils and glass substrates are noticeable to the use of Cu foils for flexible solar cells.

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