| Autor: |
Gadde+, Janardhan Rao, Karmakar+, Anasuya, Maji+, Tuhin Kumar, Mukherjee, Subhrajit, Alexander, Rajath, Sharma, Anjanashree M R, Das, Sarthak, Mondal, Anirban, Dasgupta, Kinshuk, Naik, Akshay, Majumdar, Kausik, Hawaldar, Ranjit, Adarsh, K V, Ray, Samit Kumar, Karmakar, Debjani |
| Rok vydání: |
2021 |
| Předmět: |
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| Zdroj: |
Phys. Rev. Materials 5, 054006 (2021) |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1103/PhysRevMaterials.5.054006 |
| Popis: |
Over the last few years, ReS2 has generated a myriad of unattended queries regarding its structure, the concomitant thickness dependent electronic properties and apparently contrasting experimental optical response. In this work, with elaborate first-principles investigations, using density functional theory (DFT) and time-dependent DFT (TDDFT), we identify the structure of ReS2, which is capable of reproducing and analyzing the layer-dependent optical response. The theoretical results are further validated by an in-depth structural, chemical, optical and optoelectronic analysis of the large-area ReS2 thin films, grown by chemical vapor deposition (CVD) process. Micro-Raman (MR), X-ray photoelectron spectroscopy (XPS), cross-sectional transmission electron microscopy (TEM) and energy-dispersive X-ray analysis (EDAX) have enabled the optimization of the uniform growth of the CVD films. The correlation between the layer-dependent optical and electronic properties of the excited states was established by static photoluminescence (PL) and transient absorption (TA) measurements. Sulfur vacancy-induced localized mid-gap states render a significantly long life-time of the excitons in these films. The ionic gel top-gated photo-detectors, fabricated from the as-prepared CVD films, exhibit a large photo-response of ~ 5 A/W and a remarkable detectivity of ~ 1011 Jones. The outcome of the present work will be useful to promote the application of vertically grown large-area films in the field of optics and opto-electronics. |
| Databáze: |
arXiv |
| Externí odkaz: |
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