Laser power and high-temperature dependent Raman studies of layered bismuth and copper-based oxytellurides for optoelectronic applications

Kumar, Prabhukrupa C.; Senapati, Subrata; Pradhan, Monalisa; Pradhan, Gopal K.; Naik, Ramakanta

doi:10.1039/d4cp00562g

Cited by 4 publications

(1 citation statement)

References 80 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For the BOT-5 and BOT-15 samples, the Raman peak at 162 cm –1 did not appear, whereas this peak appeared for the BOT-10 sample. The probable reason for this observation can be attributed to the fact that the bonds might get disturbed due to prolonged MW irradiation of 15 min, while a lower MW irradiation time of 5 min would not be enough to form the bond . MW irradiation for 10 min appears to be the optimal condition for synthesizing the BOT sample.…”

Section: Resultsmentioning

confidence: 99%

Two-Dimensional Bi₂O₅Te Nanosheets for Sensitive and Fast Response Broadband Visible Light Photodetectors

Kumar,

Pradhan,

Senapati

et al. 2024

ACS Appl. Electron. Mater.

Self Cite

View full text Add to dashboard Cite

2D materials showcase numerous distinct optical and electronic characteristics that are incredibly essential for implementation in optoelectronic devices. In the past few years, photodetectors have been a significant focus because of their diverse applications. The challenge lies in developing environmentally friendly materials to fabricate cost-effective, high-performance devices. Bismuth oxychalcogenide nanosheets (Bi2O2X, X = S, Se, Te) in their 2D form, due to their impressive theoretical and experimental characteristics, have become promising alternatives for potential applications in optoelectronic devices. One of its most common oxide phases, i.e., Bi2O5Te, also possesses quite interesting nonlinear optical, photorefractive, and many other physical properties, which have yet to be explored. Here, this study reports the photodetectors based on 2D Bi2O5Te nanomaterials prepared using a “microwave-assisted method,” an exciting choice for synthesizing such nanomaterials in bulk. The basic characterizations confirmed the sample’s phase and presence of constituent elements, whereas microscopic studies demonstrated its 2D layered nature. Verification of different bonds between the atoms is observed in the Raman studies. Optical studies represent the band edges of the samples between 400 to 600 nm, which is significant as it is useful in optoelectronic devices such as solar cells, LEDs, and photodetectors. The band gaps of the materials appeared to be in the 2.72 to 2.95 eV range. Centers of the broad photoluminescence spectra are obtained around 650–700 nm, which suggests the optoelectronics applicability of the material. Figures of merits such as sensitivity, responsivity, and detectivity values are obtained from the photodetection measurements. Time-dependent photoresponse characteristics show a high I on/I off ratio, which is quite impressive for fabricating highly sensitive photodetectors.

show abstract

Section: Resultsmentioning

confidence: 99%

Two-Dimensional Bi₂O₅Te Nanosheets for Sensitive and Fast Response Broadband Visible Light Photodetectors

Kumar,

Pradhan,

Senapati

et al. 2024

ACS Appl. Electron. Mater.

Self Cite

View full text Add to dashboard Cite

show abstract

Structural and optoelectronic studies of BiCuOS semiconductor: A potential photoconverter

Meenu,

Shyam,

Aswin

et al. 2024

Materials Science and Engineering: B

View full text Add to dashboard Cite

Superior Performance of 2D Layered Bimetallic Bismuth and Copper Oxytellurides for Supercapacitor Applications

Kumar,

Nechikott,

Nayak

et al. 2024

ACS Appl. Energy Mater.

View full text Add to dashboard Cite

Widespread applications of 2D metal oxychalcogenide materials in the fields of semiconductors, thermoelectrics, and optoelectronics have raised the interest of the research community to explore more about these materials. The addition of metals and the preparation of different combinations of composite materials can effectively raise their utility. Here, the synthesis of bismuth (Bi)-and copper (Cu)-based layered oxytelluride materials is performed using the "microwave method" at a fixed power of 540 W and an irradiation time of 20 min. Good crystalline phases of the synthesized materials are obtained from the crystallographic studies, which agree well with the reported studies done previously. Morphological studies show the appearance of nanosheet-like structures in different synthesized samples. The Raman spectra of the samples demonstrate several vibrational modes. Chemical analysis confirms the valence states of the individual elements. The synthesized bismuth oxytelluride (BOT), copper oxytelluride (COT), and bismuth copper oxytelluride (BCOT) samples are investigated for supercapacitor applications. The electrochemical capacitive performance of BOT, COT, and BCOT is studied in the potential range of 0−0.6 V in an aqueous 2 M KOH electrolyte. While BOT and COT exhibit only 95 F g −1 (57 C g −1 ) and 158 F g −1 (94.8 C g −1 ), respectively, BCOT can provide a higher specific capacitance of 323 F g −1 (193.8 C g −1 ) at a specific current of 2 A g −1 , with excellent cycling stability of 90.5% after continuous 5000 cycles. Thus, this study emphasizes the better capacitive performance of bimetallic oxychalcogenides over monometallic oxychalcogenides.

show abstract

Laser power and high-temperature dependent Raman studies of layered bismuth and copper-based oxytellurides for optoelectronic applications

Abstract: The layered metal oxychalcogenide materials have gained significant attention in recent years due to the numerous applications in various emerging fields. Among them, the bismuth (Bi)-based ternary and quaternary oxychalcogenide...

Cited by 4 publications

References 80 publications

Two-Dimensional Bi₂O₅Te Nanosheets for Sensitive and Fast Response Broadband Visible Light Photodetectors

Two-Dimensional Bi₂O₅Te Nanosheets for Sensitive and Fast Response Broadband Visible Light Photodetectors

Structural and optoelectronic studies of BiCuOS semiconductor: A potential photoconverter

Superior Performance of 2D Layered Bimetallic Bismuth and Copper Oxytellurides for Supercapacitor Applications

Contact Info

Product

Resources

About

Laser power and high-temperature dependent Raman studies of layered bismuth and copper-based oxytellurides for optoelectronic applications

Abstract: The layered metal oxychalcogenide materials have gained significant attention in recent years due to the numerous applications in various emerging fields. Among them, the bismuth (Bi)-based ternary and quaternary oxychalcogenide...

Cited by 4 publications

References 80 publications

Two-Dimensional Bi2O5Te Nanosheets for Sensitive and Fast Response Broadband Visible Light Photodetectors

Two-Dimensional Bi2O5Te Nanosheets for Sensitive and Fast Response Broadband Visible Light Photodetectors

Structural and optoelectronic studies of BiCuOS semiconductor: A potential photoconverter

Superior Performance of 2D Layered Bimetallic Bismuth and Copper Oxytellurides for Supercapacitor Applications

Contact Info

Product

Resources

About

Two-Dimensional Bi₂O₅Te Nanosheets for Sensitive and Fast Response Broadband Visible Light Photodetectors

Two-Dimensional Bi₂O₅Te Nanosheets for Sensitive and Fast Response Broadband Visible Light Photodetectors