Nihan KOSKU PERKGÖZ

112123

CVD GROWTH and CHARACTERIZATION OF 2D TRANSITION METAL DICHALCOGENIDES, MoS2 and WS2

Two-dimensional transition metal dichalcogenides (TMDC), specifically molybdenum disulfide and tungsten disulfide have received significant attention as their direct bandgap exhibits a shift from indirect to direct as the layer goes to single molecular thickness (2D). Hence, they have high potential to pave way for novel optoelectronic devices. However, their structural and optical properties are still not completely understood, especially, spatial change of photoluminescence intensities, variations in excitons-trions, and shift in peak wavelengths in these 2D flake structures need further investigation. In this research work, after growing TMDCs using chemical vapor deposition technique, in addition to measuring micro Raman and photoluminescence spectra, we performed dark field microscopy measurements and photoluminescence mappings to identify grain boundaries and seeding particles. The results clearly show that the flakes, which look lie single-piece through the optical spectroscopy images, in fact, include grain boundaries, seeds and wrinkles. Photoluminescence maps reveal that emission occurs due to different mechanisms such as excitons and trions, depending on the locations on the flakes where the measurement is performed. Our results show that there are different routes that emission can occur and 2D TMDCs provide a rich variety of alternatives to realize novel photonic devices. 
Keywords:

MoS2, WS2, two-dimensional materials chemical vapor deposition,

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Eskişehir Technical University Journal of Science and Technology A - Applied Sciences and Engineering-Cover
  • ISSN: 2667-4211
  • Yayın Aralığı: Yılda 4 Sayı
  • Başlangıç: 2000
  • Yayıncı: Eskişehir Teknik Üniversitesi
Arşiv
Sayıdaki Diğer Makaleler

Eftade GAGA

Şuheda KATAR, Seda EROL, Pınar AYTAR ÇELİK, Mine ÖZDEMİR, Ahmet ÇABUK

Nihan KOSKU PERKGÖZ

Metin Bilge

Shahroz KHAN, Erkan GUNPİNAR

Emre Koyuncu, Barış Başpınar

Fatma Nur ARSLAN, Gönül AKİN, İbrahim YILMAZ

İsmail Özgür ÖZER, Çetin Meriç GÜVENÇ

Senem KUMOVA METİN, Bahar KARAOĞLAN

Kürşad Melih GÜLEREN