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Dagar P, Ghorai N, Bungla M, Ghosh HN, Ganguli AK. Understanding the charge transfer dynamics of the Cu 2WS 4-CNT-FeOOH ternary composite for photo-electrochemical studies. Phys Chem Chem Phys 2023; 25:30867-30879. [PMID: 37937581 DOI: 10.1039/d3cp03498d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2023]
Abstract
Ternary transition metal chalcogenide (Cu2WS4) is a semiconductor with a band gap of 2.1 eV and could be a promising candidate for photoelectrochemical water splitting and solar energy conversion applications. Despite numerous reports on ternary transition metal chalcogenides, this semiconductor's ultrafast charge transfer dynamics remain unknown. Here, we report on charge carrier dynamics in a pristine Cu2WS4 system with the aid of ultrafast transient (TA) pump-probe spectroscopy and a hot carrier transfer process from Cu2WS4 to multi-walled carbon nanotubes (CNTs) and FeOOH has been observed. Furthermore, we have explored Cu2WS4-FeOOH having a type-II composite for photo-electrochemical (PEC) water oxidation and modified this with the addition of multi-walled carbon nanotubes to expedite the charge-transfer processes and photo-anodic performance. The photo-electrochemical studies demonstrate that the Cu2WS4-CNT, Cu2WS4-FeOOH, and Cu2WS4-CNT-FeOOH provide nearly 3-, 8- and 12-fold enhancement in photocurrent density relative to the bare Cu2WS4 photo-anode at 1.23 V vs. RHE. These photo-electrochemical studies support the results obtained from the TA investigation and further prove the higher charge separation in the ternary composite system. These studies probe the excited states and provide evidence of longer charge separation in the binary and ternary composites, responsible for their remarkable photo-electrochemical performance.
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Affiliation(s)
- Preeti Dagar
- Institute of Nano Science and Technology, Sector-81, Knowledge City, SAS Nagar, Punjab-140306, India
| | - Nandan Ghorai
- Institute of Nano Science and Technology, Sector-81, Knowledge City, SAS Nagar, Punjab-140306, India
| | - Manisha Bungla
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India.
| | - Hirendra N Ghosh
- Institute of Nano Science and Technology, Sector-81, Knowledge City, SAS Nagar, Punjab-140306, India
- Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India.
- Department of Chemical Sciences, National Institute of Science Education and Research Bhubaneswar, Jatni, Khurda 752050, Odisha, India
| | - Ashok K Ganguli
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India.
- Department of Materials Science and Engineering, Indian Institute of Technology Delhi, New Delhi-110016, India
- Department of Chemical Sciences, Indian Institute of Science Education & Research, Berhampur, Laudigam, Odisha 760003, India
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2
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Dagar P, Kumar S, Ganguli AK. Effect of Mn 2+ incorporation on the photoelectrochemical properties of BiVO 4. NEW J CHEM 2022. [DOI: 10.1039/d1nj05292f] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Mn2+–BiVO4 photoanodes (Mn2+ = 0.2–1%) to improve the charge-carrier separation and electrical conductivity of BiVO4 are reported.
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Affiliation(s)
- Preeti Dagar
- Institute of Nano Science and Technology, Sector-81, Knowledge City, Sahibzada Ajit Singh Nagar, Punjab 140306, India
| | - Sandeep Kumar
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India
| | - Ashok Kumar Ganguli
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India
- Department of Materials Science and Engineering, Indian Institute of Technology Delhi, New Delhi 110016, India
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3
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Justice Babu K, Kaur G, Shukla A, Kaur A, Goswami T, Ghorai N, Ghosh HN. Concurrent Energy- and Electron-Transfer Dynamics in Photoexcited Mn-Doped CsPbBr 3 Perovskite Nanoplatelet Architecture. J Phys Chem Lett 2021; 12:302-309. [PMID: 33350833 DOI: 10.1021/acs.jpclett.0c03267] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Mn-doped perovskites have already been widely explored in the context of interesting optical, electronic, and magnetic properties. Such fascinating traits showcased by them explain the huge augmentation in the device efficiency, directing their widespread application in the field of solar cells, energy- harvesting sectors, and light-emitting diodes. However, the underlying photophysics governing the overall charge carrier dynamics in Mn-doped CsPbBr3 nanoplatelets (NPLs) has never been discussed and therefore demands an in-depth investigation. Herein, fluorescence up-conversion and femtosecond transient absorption (TA) spectroscopy are employed for gaining a comprehensive understanding of the excited-state dynamics and the fundamental energy/charge-transfer processes for two-dimensional CsPbBr3 nanoplatelets (NPLs) and their Mn-doped counterparts. The up-conversion measurement clearly suggests the possibility of energy-transfer pathways in the Mn-doped CsPbBr3 NPLs. Interestingly, strong indication of charge transfer (CT) in Mn-doped CsPbBr3 NPLs was unambiguously established by an ultrafast TA approach. Our investigation clearly suggests that both the probable processes viz. the ultrafast energy and electron transfers noticeable in the Mn2+-doped CsPbBr3 NPLs are utterly competitive and rapid owing to the highly confined nature of the two-dimensional NPLs. This extensive probing of concurrent charge/energy-transfer processes may pave help clarify unresolved anomalies in Mn-doped perovskites, which may prove advantageous for a wide range of practical applicability.
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Affiliation(s)
| | - Gurpreet Kaur
- Institute of Nano Science and Technology, Mohali, Punjab 160062, India
| | - Ayushi Shukla
- Institute of Nano Science and Technology, Mohali, Punjab 160062, India
| | - Arshdeep Kaur
- Institute of Nano Science and Technology, Mohali, Punjab 160062, India
| | - Tanmay Goswami
- Institute of Nano Science and Technology, Mohali, Punjab 160062, India
| | - Nandan Ghorai
- Institute of Nano Science and Technology, Mohali, Punjab 160062, India
| | - Hirendra N Ghosh
- Institute of Nano Science and Technology, Mohali, Punjab 160062, India
- Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Mumbai 400085, India
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4
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Parobek D, Qiao T, Son DH. Energetic hot electrons from exciton-to-hot electron upconversion in Mn-doped semiconductor nanocrystals. J Chem Phys 2019; 151:120901. [PMID: 31575181 DOI: 10.1063/1.5119398] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Generation of hot electrons and their utilization in photoinduced chemical processes have been the subjects of intense research in recent years mostly exploring hot electrons in plasmonic metal nanostructures created via decay of optically excited plasmon. Here, we present recent progress made in generation and utilization of a different type of hot electrons produced via biphotonic exciton-to-hot electron "upconversion" in Mn-doped semiconductor nanocrystals. Compared to the plasmonic hot electrons, those produced via biphotonic upconversion in Mn-doped semiconductor nanocrystals possess much higher energy, enabling more efficient long-range electron transfer across the high energy barrier. They can even be ejected above the vacuum level creating photoelectrons, which can possibly produce solvated electrons. Despite the biphotonic nature of the upconversion process, hot electrons can be generated with weak cw excitation equivalent to the concentrated solar radiation without requiring intense or high-energy photons. This perspective reviews recent work elucidating the mechanism of generating energetic hot electrons in Mn-doped semiconductor nanocrystals, detection of these hot electrons as photocurrent or photoelectron emission, and their utilization in chemical processes such as photocatalysis. New opportunities that the energetic hot electrons can open by creating solvated electrons, which can be viewed as the longer-lived and mobile version of hot electrons more useful for chemical processes, and the challenges in practical utilization of energetic hot electrons are also discussed.
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Affiliation(s)
- David Parobek
- Department of Chemistry, Texas A&M University, College Station, Texas 77843, USA
| | - Tian Qiao
- Department of Chemistry, Texas A&M University, College Station, Texas 77843, USA
| | - Dong Hee Son
- Department of Chemistry, Texas A&M University, College Station, Texas 77843, USA
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Yadav AN, Singh AK, Srivastava S, Kumar M, Gupta BK, Singh K. Ultrafast charge carrier dynamics in CdSe/V 2O 5 core/shell quantum dots. Phys Chem Chem Phys 2019; 21:6265-6273. [PMID: 30834922 DOI: 10.1039/c9cp00031c] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
Ultrafast transient absorption (TA) spectroscopy has been carried out to study the charge carrier dynamics of CdSe core and CdSe/V2O5 core/shell quantum dots (QDs). A significant redshift accompanied by broadening in the first excitonic peak was observed in the UV-Vis absorption spectra of the core/shell QDs as the shell thickness increases. This interesting observation is related to a quasi-type-II alignment characterized by the spatial separation of an electron into the core/shell and a hole into the core. The observed optical excitonic spectra have further been used to study the energetics of CdSe and charge separated states with the concept of Marcus theory and confirmed that electron transfer takes place in the Marcus inverted region (). Moreover, the growth kinetics of the CdSe core and CdSe/V2O5 core/shell QDs, studied with TA spectroscopy, exhibits slow electron cooling in core/shell QDs because of the de-coupling of the electronic wave functions with their hole counterpart. These exciting properties reveal a new paradigm shift from CdSe QDs to CdSe/V2O5 core/shell QDs for highly suitable applications in photovoltaics (PV) and optoelectronic devices.
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Affiliation(s)
- Amar Nath Yadav
- School of Physical Sciences, Jawaharlal Nehru University, New Delhi-110067, India.
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Maiti S, Dana J, Ghosh HN. Correlating Charge‐Carrier Dynamics with Efficiency in Quantum‐Dot Solar Cells: Can Excitonics Lead to Highly Efficient Devices? Chemistry 2018; 25:692-702. [DOI: 10.1002/chem.201801853] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2018] [Revised: 07/06/2018] [Indexed: 11/06/2022]
Affiliation(s)
- Sourav Maiti
- Radiation & Photochemistry DivisionBhabha Atomic Research Centre Mumbai 400085 India
- Department of ChemistrySavitribai Phule Pune University Ganeshkhind Pune 411007 India
| | - Jayanta Dana
- Radiation & Photochemistry DivisionBhabha Atomic Research Centre Mumbai 400085 India
| | - Hirendra N. Ghosh
- Radiation & Photochemistry DivisionBhabha Atomic Research Centre Mumbai 400085 India
- Institute of Nano Science and Technology Mohali Punjab 160062 India
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7
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Samadi-Maybodi A, Shariati MR, Hosseinzadeh Colagar A. Magnetically Separable Fe3
O4
@CdS Type-II Nanohybrids with Excellent Photocatalytic Activity and Antibacterial Properties. Chempluschem 2018; 83:769-779. [DOI: 10.1002/cplu.201800315] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2018] [Indexed: 11/11/2022]
Affiliation(s)
- Abdolraouf Samadi-Maybodi
- Analytical Division; Faculty of Chemistry; University of Mazandaran, Pasdaran Street 416; Babolsar Iran
| | - Mohammad Reza Shariati
- Analytical Division; Faculty of Chemistry; University of Mazandaran, Pasdaran Street 416; Babolsar Iran
| | - Abasalt Hosseinzadeh Colagar
- Department of Molecular and Cell Biology; Faculty of Sciences; University of Mazandaran, Pasdaran Street 416; Babolsar 47416-95447 Iran
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Liu H, Moronta D, Li L, Yue S, Wong SS. Synthesis, properties, and formation mechanism of Mn-doped Zn2SiO4 nanowires and associated heterostructures. Phys Chem Chem Phys 2018; 20:10086-10099. [DOI: 10.1039/c8cp00151k] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Charge transfer and energy transfer phenomena were observed and analyzed in heterostructure systems composed of CdSe QDs immobilized onto Mn-doped Zn2SiO4 nanowire host materials.
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Affiliation(s)
- Haiqing Liu
- Department of Chemistry
- State University of New York at Stony Brook
- Stony Brook
- USA
| | - Dominic Moronta
- Department of Chemistry
- State University of New York at Stony Brook
- Stony Brook
- USA
| | - Luyao Li
- Department of Chemistry
- State University of New York at Stony Brook
- Stony Brook
- USA
| | - Shiyu Yue
- Department of Chemistry
- State University of New York at Stony Brook
- Stony Brook
- USA
| | - Stanislaus S. Wong
- Department of Chemistry
- State University of New York at Stony Brook
- Stony Brook
- USA
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9
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Wu W, Ren S, Han Q, Gao Y, Kong D. Ultrafast spectroscopic studies of composition-dependent near-infrared-emitting alloyed CdSeTe quantum dots. Phys Chem Chem Phys 2018; 20:23556-23563. [DOI: 10.1039/c8cp03904f] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
In this study, ultrafast optical properties of composition-dependent near infrared-emitting alloyed CdSeTe quantum dots are measured and analyzed.
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Affiliation(s)
- Wenzhi Wu
- School of Electronic Engineering
- Heilongjiang University
- Harbin
- China
| | - Shiwei Ren
- School of Electronic Engineering
- Heilongjiang University
- Harbin
- China
| | - Qiuju Han
- School of Science
- Northeast Agricultural University
- Harbin
- China
| | - Yachen Gao
- School of Electronic Engineering
- Heilongjiang University
- Harbin
- China
| | - Degui Kong
- School of Electronic Engineering
- Heilongjiang University
- Harbin
- China
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10
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Debnath T, Parui K, Maiti S, Ghosh HN. An Insight into the Interface through Excited-State Carrier Dynamics for Promising Enhancement of Power Conversion Efficiency in a Mn-Doped CdZnSSe Gradient Alloy. Chemistry 2017; 23:3755-3763. [DOI: 10.1002/chem.201605612] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2016] [Indexed: 11/07/2022]
Affiliation(s)
- Tushar Debnath
- Radiation & Photochemistry Division; Bhabha Atomic Research Centre; Mumbai 400 085 India), Fax
| | - Kausturi Parui
- Radiation & Photochemistry Division; Bhabha Atomic Research Centre; Mumbai 400 085 India), Fax
| | - Sourav Maiti
- Radiation & Photochemistry Division; Bhabha Atomic Research Centre; Mumbai 400 085 India), Fax
- Department of Chemistry; Savitribai Phule Pune University; Pune 411007 India
| | - Hirendra N. Ghosh
- Radiation & Photochemistry Division; Bhabha Atomic Research Centre; Mumbai 400 085 India), Fax
- Institute of Nano Science and Technology; Mohali Punjab 16062 India
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11
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Hung LX, Bassène PD, Thang PN, Loan NT, Daney de Marcillac W, Dhawan AR, Feng F, Esparza-Villa JU, Thuc Hien NT, Liem NQ, Coolen L, Nga PT. Near-infrared emitting CdTeSe alloyed quantum dots: Raman scattering, photoluminescence and single-emitter optical properties. RSC Adv 2017. [DOI: 10.1039/c7ra06500k] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The synthesis of ternary core/shell zinc-blende CdTeSe/ZnSe quantum dots with optimal synthesis parameters is analyzed.
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12
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Pandey A, Sarma DD. Recent Advances in Manganese Doped II-VI Semiconductor Quantum Dots. Z Anorg Allg Chem 2016. [DOI: 10.1002/zaac.201600368] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Anshu Pandey
- Solid State and Structural Chemistry Unit; Indian Institute of Science; 560012 Bangalore India
| | - Dipankar Das Sarma
- Solid State and Structural Chemistry Unit; Indian Institute of Science; 560012 Bangalore India
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