Preprint Open Access

Large Area MOVPE Growth of Topological Insulator Bi2Te3 Epitaxial Layers on i-Si (111)

Arun Kumar; Raimondo Cecchini; Lorenzo Locatelli; Claudia Wiemer; Christian Martella; Lucia Nasi; Laura Lazzarini; Roberto Mantovan; Massimo Longo


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{
  "DOI": "10.1021/acs.cgd.1c00328", 
  "container_title": "Crystal Growth & Design", 
  "title": "Large Area MOVPE Growth of Topological Insulator Bi2Te3 Epitaxial Layers on i-Si (111)", 
  "issued": {
    "date-parts": [
      [
        2021, 
        6, 
        3
      ]
    ]
  }, 
  "abstract": "<p>Bi<sub>2</sub>Te<sub>3 </sub>is attracting a renewed interest, due to its topological insulator properties; however, even using advanced physical and chemical deposition techniques, the growth of high-crystal quality layers on substrates allowing its technological employment, such as Si, is very challenging, due to the structural complexity of Bi<sub>2</sub>Te<sub>3</sub>. In this work, we present the optimized large area growth of topological insulator Bi<sub>2</sub>Te<sub>3</sub> epitaxial layers on un-buffered i-Si (111) substrates via Metal-Organic Vapor Phase Epitaxy (MOVPE), which is of crucial importance for future integration into CMOS compatible spintronic devices. We found that the key to maximizing the layer quality requires a balanced control of the reactor pressure (P), growth temperature (T), and growth time (t). Within a proper parameter window, the grown Bi<sub>2</sub>Te<sub>3</sub> thin layers are crystalline, stoichiometric, and highly uniform, also at the local scale. They exhibit a rhombohedral crystalline structure, and they are [001] out-of-plane oriented on the i-Si (111) substrate. Low temperature magnetoresistance measurements revealed clear Weak Antilocalization (WAL) effects, demonstrating that the optimized MOVPE - grown Bi<sub>2</sub>Te<sub>3</sub> is a topological insulator, hence opening further possibilities for its technology-transfer to innovative devices.</p>", 
  "author": [
    {
      "family": "Arun Kumar"
    }, 
    {
      "family": "Raimondo Cecchini"
    }, 
    {
      "family": "Lorenzo Locatelli"
    }, 
    {
      "family": "Claudia Wiemer"
    }, 
    {
      "family": "Christian Martella"
    }, 
    {
      "family": "Lucia Nasi"
    }, 
    {
      "family": "Laura Lazzarini"
    }, 
    {
      "family": "Roberto Mantovan"
    }, 
    {
      "family": "Massimo Longo"
    }
  ], 
  "version": "preprint", 
  "type": "article", 
  "id": "4896787"
}
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