Low-temperature (∼180°C) position-controlled lateral solid-phase crystallization of GeSn with laser-anneal seeding

Ryo Matsumura, Hironori Chikita, Yuki Kai, Taizoh Sadoh, Hiroshi Ikenoue, Masanobu Miyao

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

To realize next-generation flexible thin-film devices, solid-phase crystallization (SPC) of amorphous germanium tin (GeSn) films on insulating substrates combined with seeds formed by laser annealing (LA) has been investigated. This technique enables the crystallization of GeSn at controlled positions at low temperature (∼180°C) due to the determination of the starting points of crystallization by LA seeding and Sn-induced SPC enhancement. The GeSn crystals grown by SPC from LA seeds showed abnormal lateral profiles of substitutional Sn concentration. These lateral profiles are caused by the annealing time after crystallization being a function of distance from the LA seeds. This observation of a post-annealing effect also indicates that GeSn with a substitutional Sn concentration of up to ∼10% possesses high thermal stability. These results will facilitate the fabrication of next-generation thin-film devices on flexible plastic substrates with low softening temperatures (∼250°C).

Original languageEnglish
Article number262106
JournalApplied Physics Letters
Volume107
Issue number26
DOIs
Publication statusPublished - Dec 28 2015

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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