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Solar light driven photoelectrochemical water splitting using Mn-doped CdS quantum dots sensitized hierarchical rosette-rod TiO2 photoanodes. J Electroanal Chem (Lausanne) 2022. [DOI: 10.1016/j.jelechem.2022.116384] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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2
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Geng H, Jiang N, Li C, Zhu X, Qiao Y, Cai Q. Efficient photocatalytic inactivation of E. coli by Mn-CdS/ZnCuInSe/CuInS 2 quantum dots-sensitized TiO 2 nanowires. NANOTECHNOLOGY 2020; 31:395602. [PMID: 32340006 DOI: 10.1088/1361-6528/ab8d6c] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
A novel visible light-driven photocatalyst (represented as Mn-CdS/ZCISe/CIS/TiO2) for the passivation of E. coli was prepared with TiO2 nanowires as support and using CuInS2 (CIS) and ZnCuInSe (ZCISe) quantum dots (QDs), as well as Mn-doped CdS (Mn-CdS) nanoparticles (NPs) as sensitizers. The use of CIS and ZCISe QDs and Mn-CdS NPs extends the light harvest region to visible light. The photoelectric conversion efficiency was consequently improved, with a photocurrent density of 12.5 mA cm-2, about 60 times that of pure TiO2 nanowires. The germicidal efficiency of the photocatalyst was assessed by passivation of E. coli, 96% bacteria in 50 ml 105 colony forming units (CFU) ml-1 solution were killed within 50 min. Besides the high efficiency, the composite has good stability and satisfactory recycling performance. The antibiotic mechanism was also performed by using photoluminescence and a scavenging agent of different active matter, revealing that the photo-generated holes play a major role in the sterilization process.
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Affiliation(s)
- Hongchao Geng
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, People's Republic of China
| | - Ning Jiang
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, People's Republic of China
| | - Chenyi Li
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, People's Republic of China
| | - Xingqi Zhu
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, People's Republic of China
| | - Yan Qiao
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, People's Republic of China
| | - Qingyun Cai
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, People's Republic of China
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3
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Maity P, Ghosh HN. Strategies for extending charge separation in colloidal nanostructured quantum dot materials. Phys Chem Chem Phys 2019; 21:23283-23300. [PMID: 31621729 DOI: 10.1039/c9cp03551f] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Semiconductor colloidal metal chalcogenides (II-VI) in the form of quantum dots (QDs) and different heterostructures (core/shell, alloys, etc.) are of extensive interest in scientific research for both a fundamental understanding and technological applications because of their quantized size and different optical properties; however, due to their small size, the exciton (bound electron and hole) experiences a strong Coulombic attraction, which has a remarkable impact on the charge separation and photophysical properties of QDs. Thus, to achieve an efficient charge separation, numerous attempts have been made via the formation of different heterostructures, QD/molecular adsorbate (either organic or inorganic) assemblies, etc. These hybrid materials ameliorated the absorption of the incident light as well as charge separation. This article reviews the strategies for extending charge separation in these colloidal nanocrystals (NCs), which is one of the crucial steps to elevate the solar to electrical energy conversion efficiency in a quantum dot-sensitized solar cell (QDSC). The article summarizes the benefits of co-sensitization and experimental shreds of evidence for the multiple charge transfer processes involved in a QDSC. Studies have shown that in the co-sensitization process, prolonged charge separation occurs via the dual behavior of the molecular adsorbate, sensitization (electron injection) and capture of holes from photoexcited QDs. This perspective emphases band edge engineering and control of charge carrier dynamics in various core/shell structures. The impact of colloidal alloy NCs on charge separation and interesting photophysical properties was recapitulated via the steady-state and time-resolved photoluminescence (PL) and femtosecond transient absorption spectroscopic techniques. Finally, the prolonged lifetime and extent of charge separation for these hybrid NCs (or the composites) assisted in the development of a better light harvester as compared to the case of their pure counterparts.
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Affiliation(s)
- Partha Maity
- Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Homi Bhabha National Institute, Mumbai-400085, India.
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Abate MA, Dehvari K, Chang JY, Waki K. Aqueous synthesis of Mn-doped CuInSe2 quantum dots to enhance the performance of quantum dot sensitized solar cells. Dalton Trans 2019; 48:16115-16122. [DOI: 10.1039/c9dt03163d] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Mn-Doped QDs extended light absorption by altering the bandgap and facilitated rapid electron injection and charge separation, which together result in enhanced overall power conversion efficiency (PCE).
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Affiliation(s)
- Mulu Alemayehu Abate
- Department of Chemical Engineering
- National Taiwan University of Science and Technology
- Taipei
- Republic of China
| | - Khalilalrahman Dehvari
- Department of Chemical Engineering
- National Taiwan University of Science and Technology
- Taipei
- Republic of China
| | - Jia-Yaw Chang
- Department of Chemical Engineering
- National Taiwan University of Science and Technology
- Taipei
- Republic of China
- Taiwan Building Technology Center
| | - Keiko Waki
- Department of Chemical Science and Engineering
- School of Materials and Chemical Technology
- Tokyo Institute of Technology
- Yokohama-shi 226-8502
- Japan
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5
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Lu S, Peng S, Zhang Z, Deng Y, Qin T, Huang J, Ma F, Hou J, Cao G. Impacts of Mn ion in ZnSe passivation on electronic band structure for high efficiency CdS/CdSe quantum dot solar cells. Dalton Trans 2018; 47:9634-9642. [PMID: 29974101 DOI: 10.1039/c8dt01943f] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Surface passivation in quantum dot-sensitized solar cells (QDSSCs) plays a very important role in preventing surface charge recombination and thus enhancing the power conversion efficiency (PCE). ZnSe passivation with dopant in CdS/CdSe co-sensitized QDSSCs has been demonstrated as an effective way to improve the PCE. In the present study, a series of characterizations revealed that a Mn-doped ZnSe passivation layer can not only reduce surface charge recombination, but also enhance light harvesting. By means of density functional theory calculation along with a systematic study of electronic band structure, it has been found that the valence band of ZnSe moves upward on Mn-ion doping which leads to acceleration of charge separation and broader light absorption range. The impact of the Mn ion on charge recombination and light harvesting has been interpreted reasonably and the PCE of CdS/CdSe co-sensitized QDSSCs with Mn-doped ZnSe passivation layer is as high as 6.46%, which is 1.5 times that of the solar cell without the passivation layer.
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Affiliation(s)
- Shuqi Lu
- School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, P.R. China.
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Pan Z, Rao H, Mora-Seró I, Bisquert J, Zhong X. Quantum dot-sensitized solar cells. Chem Soc Rev 2018; 47:7659-7702. [DOI: 10.1039/c8cs00431e] [Citation(s) in RCA: 259] [Impact Index Per Article: 43.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
A comprehensive overview of the development of quantum dot-sensitized solar cells (QDSCs) is presented.
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Affiliation(s)
- Zhenxiao Pan
- College of Materials and Energy
- South China Agricultural University
- Guangzhou 510642
- China
| | - Huashang Rao
- College of Materials and Energy
- South China Agricultural University
- Guangzhou 510642
- China
| | - Iván Mora-Seró
- Institute of Advanced Materials (INAM)
- Universitat Jaume I
- 12006 Castelló
- Spain
| | - Juan Bisquert
- Institute of Advanced Materials (INAM)
- Universitat Jaume I
- 12006 Castelló
- Spain
| | - Xinhua Zhong
- College of Materials and Energy
- South China Agricultural University
- Guangzhou 510642
- China
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Prado SJ, Marques GE, Alcalde AM. Photovoltaic efficiency of intermediate band solar cells based on CdTe/CdMnTe coupled quantum dots. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2017; 29:445301. [PMID: 28799524 DOI: 10.1088/1361-648x/aa85c7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
In this work we show the calculation of optimized efficiencies of intermediate band solar cells (IBSCs) based on Mn-doped II-VI CdTe/CdMnTe coupled quantum dot (QD) structures. We focus our attention on the combined effects of geometrical and Mn-doping parameters on optical properties and solar cell efficiency. In the framework of [Formula: see text] theory, we accomplish detailed calculations of electronic structure, transition energies, optical selection rules and their corresponding intra- and interband oscillator strengths. With these results and by following the intermediate band model, we have developed a strategy which allows us to find optimal photovoltaic efficiency values. We also show that the effects of band admixture which can lead to degradation of optical transitions and reduction of efficiency can be partly minimized by a careful selection of the structural parameters and Mn-concentration. Thus, the improvement of band engineering is mandatory for any practical implementation of QD systems as IBSC hardware. Finally, our calculations show that it is possible to reach significant efficiency, up to ∼26%, by selecting a restricted space of parameters such as quantum dot size and shape and Mn-concentration effects, to improve the modulation of optical absorption in the structures.
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Affiliation(s)
- Silvio J Prado
- Faculdade de Ciências Integradas do Pontal, Universidade Federal de Uberlândia, 38.304-402, Ituiutaba-MG, Brazil
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Mehmood I, Liu Y, Chen K, Shah AH, Chen W. Mn doped CdS passivated CuInSe2 quantum dot sensitized solar cells with remarkably enhanced photovoltaic efficiency. RSC Adv 2017. [DOI: 10.1039/c7ra04989g] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
This paper explores that novel architecture of CuInSe2/Mn-CdS exhibits remarkable enhancement in photovoltaic performance of the QDSSCs, which presents an excellent power conversion efficiency of 3.96%.
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Affiliation(s)
- Ikhtisham Mehmood
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing
- School of Materials Science and Engineering
- Wuhan University of Technology
- Wuhan 430070
- P. R. China
| | - Yueli Liu
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing
- School of Materials Science and Engineering
- Wuhan University of Technology
- Wuhan 430070
- P. R. China
| | - Keqiang Chen
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing
- School of Materials Science and Engineering
- Wuhan University of Technology
- Wuhan 430070
- P. R. China
| | - Abdul Hakim Shah
- Department of Material Physics and Nanotechnology
- Khushal Khan Khattak University
- Karak 27200
- Pakistan
| | - Wen Chen
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing
- School of Materials Science and Engineering
- Wuhan University of Technology
- Wuhan 430070
- P. R. China
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Huang F, Zhang L, Zhang Q, Hou J, Wang H, Wang H, Peng S, Liu J, Cao G. High Efficiency CdS/CdSe Quantum Dot Sensitized Solar Cells with Two ZnSe Layers. ACS APPLIED MATERIALS & INTERFACES 2016; 8:34482-34489. [PMID: 27936551 DOI: 10.1021/acsami.6b12842] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
CdS/CdSe quantum dot sensitized solar cells (QDSCs) have been intensively investigated; however, most of the reported power conversion efficiency (PCE) is still lower than 7% due to serious charge recombination and a low loading amount of QDs. Therefore, suppressing charge recombination and enhancing light absorption are required to improve the performance of QDSCs. The present study demonstrated successful design and fabrication of QDSCs with a high efficiency of 7.24% based on CdS/CdSe QDs with two ZnSe layers inserted at the interfaces between QDs and TiO2 and electrolyte. The effects of two ZnSe layers on the performance of the QDSCs were systematically investigated. The results indicated that the inner ZnSe buffer layer located between QDs and TiO2 serves as a seed layer to enhance the subsequent deposition of CdS/CdSe QDs, which leads to higher loading amount and covering ratio of QDs on the TiO2 photoanode. The outer ZnSe layer located between QDs and electrolyte behaves as an effective passivation layer, which not only reduces the surface charge recombination, but also enhances the light harvesting.
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Affiliation(s)
- Fei Huang
- Department of Materials Science and Engineering, University of Washington , Seattle, Washington 98195-2120, United States
- College of Environmental Science and Engineering, Donghua University , Shanghai 201620, P.R. China
| | - Lisha Zhang
- College of Environmental Science and Engineering, Donghua University , Shanghai 201620, P.R. China
| | - Qifeng Zhang
- Department of Materials Science and Engineering, University of Washington , Seattle, Washington 98195-2120, United States
| | - Juan Hou
- Department of Materials Science and Engineering, University of Washington , Seattle, Washington 98195-2120, United States
| | - Hongen Wang
- Department of Materials Science and Engineering, University of Washington , Seattle, Washington 98195-2120, United States
| | - Huanli Wang
- College of Environmental Science and Engineering, Donghua University , Shanghai 201620, P.R. China
| | - Shanglong Peng
- Department of Materials Science and Engineering, University of Washington , Seattle, Washington 98195-2120, United States
| | - Jianshe Liu
- College of Environmental Science and Engineering, Donghua University , Shanghai 201620, P.R. China
| | - Guozhong Cao
- Department of Materials Science and Engineering, University of Washington , Seattle, Washington 98195-2120, United States
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Shen T, Tian J, Lv L, Fei C, Wang Y, Pullerits T, Cao G. Investigation of the role of Mn dopant in CdS quantum dot sensitized solar cell. Electrochim Acta 2016. [DOI: 10.1016/j.electacta.2016.01.056] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Zhang J, Zhu A, Zhao T, Wu L, Wu P, Hou X. Glucose oxidase-directed, instant synthesis of Mn-doped ZnS quantum dots in neutral media with retained enzymatic activity: mechanistic study and biosensing application. J Mater Chem B 2015; 3:5942-5950. [PMID: 32262650 DOI: 10.1039/c5tb00917k] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Protein-directed synthesis of quantum dots (QDs) is a "greener" alternative to the current high-temperature and aqueous synthetic protocols, which provide water-soluble, biocompatible protein-functionalized QDs in one-pot. However, the protein activity in such synthetic schemes is a critical issue, since the synthetic conditions (for instance, high pH of the precursors, long time of synthesis, and disruption of disulfide bonds) are not suitable for retaining the activity (especially for enzymes). Herein, we present a facile and instant glucose oxidase (GOD)-directed strategy for the preparation of highly luminescent, phosphorescent Mn-doped ZnS (Mn-ZnS) QDs in one-step at room temperature and in neutral aqueous media. With such mild synthetic conditions, the enzymatic activity of GOD was totally retained. Furthermore, we also carried out GOD-directed synthesis of QDs with several other conditions that are reported in the literature. It turned out that the GOD enzymatic activity under these synthetic conditions was lower than that of the proposed protocol, indicating that mild synthetic conditions are the prerequisite for retaining the enzymatic activity. Importantly, the as-prepared GOD-mediated Mn-ZnS QDs exhibited high photostability, high salt tolerance and colloidal stability, and can be stored for months at 4 °C or 25 °C without changing their phosphorescent intensity and enzymatic activity. Via selective chemical modification, the exact functional groups (amino acid residues) of GOD in directing the synthesis of Mn-ZnS QDs were studied in detail. It turned out to be imidazole in histidine residues but not thiol in cysteine residues that directed the formation of Mn-ZnS QDs, and this was further confirmed with several other proteins for synthesis of Mn-ZnS QDs. The as-prepared GOD-capped Mn-ZnS QDs were employed as phosphorescent probes for background-free sensing of glucose in serum samples.
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Affiliation(s)
- Jinyi Zhang
- College of Chemistry, Sichuan University, 29 Wangjiang Road, Chengdu 610064, P. R. China
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