Revealing the nature of low-temperature photoluminescence peaks by laser treatment in van der Waals epitaxially grown WS2 monolayers

Nanoscale
V Orsi GordoC C Huang

Abstract

Monolayers of transition metal dichalcogenides (TMD) are promising materials for optoelectronics devices. However, one of the challenges is to fabricate large-scale growth of high quality TMD monolayers with the desired properties in order to expand their use in potential applications. Here, we demonstrate large-scale tungsten disulfide (WS2) monolayers grown by van der Waals Epitaxy (VdWE). We show that, in addition to the large structural uniformity and homogeneity of these samples, their optical properties are very sensitive to laser irradiation. We observe a time instability in the photoluminescence (PL) emission at low temperatures in the scale of seconds to minutes. Interestingly, this change of the PL spectra with time, which is due to laser induced carrier doping, is employed to successfully distinguish the emission of two negatively charged bright excitons. Furthermore, we also detect blinking sharp bound exciton emissions which are usually attractive for single photon sources. Our findings contribute to a deeper understanding of this complex carrier dynamics induced by laser irradiation which is very important for future optoelectronic devices based on large scale TMD monolayers.

References

Nov 8, 2012·Nature Nanotechnology·Qing Hua WangMichael S Strano
Aug 13, 2013·Nature Nanotechnology·Aaron M JonesXiaodong Xu
Apr 22, 2015·Chemical Society Reviews·Hualing Zeng, Xiaodong Cui
May 6, 2015·Nature Nanotechnology·Chitraleema ChakrabortyA Nick Vamivakas
May 6, 2015·Nature Nanotechnology·Yu-Ming HeJian-Wei Pan
May 6, 2015·Nature Nanotechnology·M KoperskiM Potemski
Oct 9, 2015·Nature Communications·S DufferwielA I Tartakovskii
Jan 14, 2016·ACS Nano·Zhengyu HeJamie H Warner
Sep 3, 2016·Nature Communications·Gerd PlechingerTobias Korn
Nov 11, 2016·Nature Communications·Yu-Ming HeChristian Schneider
Dec 15, 2016·Nano Letters·Gerd PlechingerTobias Korn
Dec 31, 2016·Physical Review Letters·Akshay SinghXiaoqin Li
Apr 7, 2017·Scientific Reports·Mark DanovichVladimir I Fal'ko
May 23, 2017·Nature Communications·Carmen Palacios-BerraqueroMete Atatüre
Jun 29, 2017·Nature Communications·Kai HaoGalan Moody
Aug 30, 2017·Nanoscale·Maciej R MolasMarek Potemski

❮ Previous
Next ❯

Citations

Jul 23, 2021·Scientific Reports·Yameng CaoFernando A Castro

❮ Previous
Next ❯

Related Concepts

Trending Feeds

COVID-19

Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.

Blastomycosis

Blastomycosis fungal infections spread through inhaling Blastomyces dermatitidis spores. Discover the latest research on blastomycosis fungal infections here.

Nuclear Pore Complex in ALS/FTD

Alterations in nucleocytoplasmic transport, controlled by the nuclear pore complex, may be involved in the pathomechanism underlying multiple neurodegenerative diseases including Amyotrophic Lateral Sclerosis and Frontotemporal Dementia. Here is the latest research on the nuclear pore complex in ALS and FTD.

Applications of Molecular Barcoding

The concept of molecular barcoding is that each original DNA or RNA molecule is attached to a unique sequence barcode. Sequence reads having different barcodes represent different original molecules, while sequence reads having the same barcode are results of PCR duplication from one original molecule. Discover the latest research on molecular barcoding here.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.

Evolution of Pluripotency

Pluripotency refers to the ability of a cell to develop into three primary germ cell layers of the embryo. This feed focuses on the mechanisms that underlie the evolution of pluripotency. Here is the latest research.

Position Effect Variegation

Position Effect Variagation occurs when a gene is inactivated due to its positioning near heterochromatic regions within a chromosome. Discover the latest research on Position Effect Variagation here.

STING Receptor Agonists

Stimulator of IFN genes (STING) are a group of transmembrane proteins that are involved in the induction of type I interferon that is important in the innate immune response. The stimulation of STING has been an active area of research in the treatment of cancer and infectious diseases. Here is the latest research on STING receptor agonists.

Microbicide

Microbicides are products that can be applied to vaginal or rectal mucosal surfaces with the goal of preventing, or at least significantly reducing, the transmission of sexually transmitted infections. Here is the latest research on microbicides.