Article
Chemistry, Physical
Bhagatram Meena, Palyam Subramanyam, Duvvuri Suryakala, Vasudevanpillai Biju, Challapalli Subrahmanyam
Summary: The study demonstrates the fabrication of a ternary photoanode (TiO2/Ag2Se/CdS) with low charge transfer resistance and high photocurrent density, achieving an estimated photon-to-hydrogen conversion efficiency of 14%.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Nanoscience & Nanotechnology
Chunyan Yang, Rui Ma, Zhe Wang, Yuanyuan Wang, Chaoyu Yu, Yonggang Liu, Yanfu Wan, Jianfeng Li, Junfeng Tong, Peng Zhang, Heng Zhang
Summary: In this study, a 35 nm thick CdS film was developed as an interfacial modification layer in quantum dot light-emitting diodes (QLEDs) to improve device performance by enhancing charge balance and suppressing interfacial exciton quenching.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Physical
Yunlong Zhao, Tengfei Liu, Chunyong Hu, Changsheng Song, Xiaolin Liu, Runchao Li, Qing Lu, Qiqian Gao, Meiling Sun, Guangchao Yin
Summary: The simultaneous etching and W-doping process improves the anchoring and charge transport properties of CdS/TiO2 films, enhancing their photoelectrochemical performances. The W-doped TiO2 shell provides more active sites and larger surface area for quantum-dots loading, while also promoting separation and transfer of photo-generated carriers.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Multidisciplinary
Yan B. Vogel, Maarten Stam, Jence T. Mulder, Arjan J. Houtepen
Summary: This article presents a strategy to actively engineer long-range charge transport in colloidal quantum dot assemblies by introducing ligand functionalities. The use of electronically coupled redox ligands enables a self-exchange chain reaction and facilitates long-range charge transport across the film. The different modes of charge transport in these assemblies and their manipulation through modulation of the Fermi level and redox ligand coverage are identified.
Review
Chemistry, Multidisciplinary
Meidan Ye, Gill M. Biesold, Meng Zhang, Weiguo Wang, Tian Bai, Zhiqun Lin
Summary: Perovskite solar cells (PSCs) have emerged as a promising candidate for next-generation photovoltaic applications, but face challenges such as moisture, thermal and UV stability, photocurrent hysteresis behavior, flexibility, and large-scale productions. Quantum dot materials have attracted research interest due to their optical, electrical, and optoelectrical properties; they can play diverse roles in PSCs and enhance efficiency and stability through strong chemical interactions with perovskites. Applications of QDs in PSCs can improve energy-level alignment, moisture stability, conversion of UV-radiation to visible light, and overall performance of the solar cells.
Review
Chemistry, Multidisciplinary
Muhammad Abdul Basit, Muhammad Aanish Ali, Zunair Masroor, Zeeshan Tariq, Jin Ho Bang
Summary: Quantum dot-sensitized solar cells (QDSSCs) have unique characteristics that make them a promising solution to the energy-economy-environment dilemma. Researchers have been strategically addressing the challenges faced by QDSSCs, such as back transfer of electrons, recombination, and photocorrosion, to improve their performance. Interfacial layers (ILs) have proved beneficial in addressing these challenges, providing surface passivation, seeding quantum dots, and controlling back electron transfer. This review discusses the multifunctional roles of ILs in QDSSCs, characterization techniques, and future prospects.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2023)
Article
Materials Science, Multidisciplinary
Behzad Mohammadfam, Hadi Veladi, Hamed Baghban
Summary: This paper introduces a simple and low-cost core-shell microsphere fabrication method based on the surface tension effect and injection-inside-polymer-matrix mechanism. CdS quantum dots are synthesized and doped inside the paraffin shell to achieve a microshell laser. The higher refractive index of the shell layer compared to the inner and outer mediums enhances the out-coupling efficiency of the laser emission.
Article
Chemistry, Multidisciplinary
Utso Bhattacharya, Tobias Grass, Adrian Bachtold, Maciej Lewenstein, Fabio Pistolesi
Summary: This study explores the transition from a Mott insulating state to a polaronic state in a system of four quantum dots coupled to the flexural degrees of freedom of a suspended carbon nanotube. The findings suggest potential for using nano-electromechanical systems to simulate strongly correlated systems with electron-phonon interactions.
Article
Energy & Fuels
Andrea Rubino, Laura Calio, Mauricio E. Calvo, Hernan Miguez
Summary: Efficient charge transport is achieved in a network of ligand-free perovskite quantum dots embedded in an insulating porous matrix, improving both yield and stability. Solar cells based on this design show a 9.3% efficiency, the highest reported for scaffold-supported PQD solar cells, and enhanced stability under solar illumination compared to bulk counterparts.
Article
Energy & Fuels
Yuanbo Yang, Shuo Wang, Simiao Li, Tiantian Li, Peng Chen, Qian Zhao, Guoran Li
Summary: For the first time, a perovskite quantum dot interlayer is used to solve the interface issue in carbon-based hole transport material-free perovskite solar cells, which acts as a morphology changer, defect passivator, and photogenerated hole extractor. Compared with the pristine perovskite film, the PQD-modified perovskite absorber shows increased contact area and high compatibility with the carbon electrode, leading to an improvement in device efficiency from 16.71% to 17.93%.
Article
Electrochemistry
Di Zhang, Sidong Zhang, Yanyan Fang, Dongmei Xie, Xiaowen Zhou, Yuan Lin
Summary: Introducing bifunctional linkers between TiO2 electrodes and quantum dots was an effective approach for the preparation of quantum dot-sensitized solar cells. Three types of linkers were studied, with phenyl MBA-TiO2 electrodes achieving the highest Cd content and PCE. The modified TiO2 electrodes showed lower electron recombination rates and higher efficiency, demonstrating the importance of linker selection for QDSCs design and optimization.
ELECTROCHIMICA ACTA
(2021)
Article
Energy & Fuels
Wenlei Lv, Yilong Lei, Jianping Deng, Junfei Fang, Wendeng Huang
Summary: Metal ion doping is an effective method to improve the optical and electrical properties of quantum dots (QDs). In this study, Zn-doped CdS and CdSe QDs were synthesized using the SILAR method and utilized in the construction of sensitized solar cells (QDSSCs). The results showed that Zn doping significantly enhanced the power conversion efficiency (PCE) of the QDSSCs by improving the current density, open-circuit voltage, and light absorbance. The Zn doping also reduced the interfacial charge recombination rate and prolonged the electron lifetime, resulting in more efficient charge collection in the QDSSCs.
Article
Chemistry, Physical
Fushuang Niu, Quan Zhou, Rong Liu, Ke Hu
Summary: This study introduces a hybrid quantum dot-molecular photoanode assembly that achieves efficient water oxidation through lateral hole transfer. The results show that the faradaic efficiency of water oxidation significantly increases when HT molecules are present.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Biochemical Research Methods
Yilun Sheng, Zhongnan Huang, Yaling Chen, Xiaoyun Guo, Lan Chen, Huaping Peng, Wei Chen
Summary: This study proposes a highly sensitive and facile fluorescence-sensing platform based on a high-quantum-yield sulfur quantum dot probe for the detection of nifedipine. The method is simple, sensitive, and can be used for the analysis of pharmaceutical components.
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
(2022)
Article
Optics
Vladimir Pavlenko, Igor Beloussov
Summary: The dynamic and spectral characteristics of close-packed quantum dots excited by a -30 ps long laser pulse in a film prepared by a drop casting method from toluene solution were investigated. The wavelength of photoluminescence of single excitons and the wavelength of amplified spontaneous radiation associated with a stimulated decay of biexcitons were obtained. The dynamics of these two types of radiation were analyzed from the spectrogram of the time-resolved photoluminescence. It was found that the peak maximum of single excitons appears later than the maximum of amplified spontaneous radiation, and slowly narrows and diminishes over time. The amplified spontaneous radiation lasts for 200 ps.
JOURNAL OF LUMINESCENCE
(2023)
Article
Energy & Fuels
Rambabu Sydam, Manoranjan Ojha, Melepurath Deepa
Summary: The addition of a disodium salt of ethylenediamine tetra acetic acid (EDTA) to the ionogel electrolyte addresses the issue of poor efficiency and undesirable stacking in Heptyl viologen (HV) based electrochromic devices, resulting in improved performance metrics and thermal robustness.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2021)
Article
Energy & Fuels
Manoranjan Ojha, Xinhua Liu, Billy Wu, Melepurath Deepa
Summary: The study developed supercapacitors using holey graphitic carbon nano-flakes with high specific capacitance for the first time, achieving significant enhancement in performance by applying a unique structure design and carbon fabric for additional conductivity. The peak energy and power densities of the cell were superior to many reported nano-carbons, demonstrating excellent potential for high-performance energy storage applications.
Article
Chemistry, Physical
Manoranjan Ojha, Billy Wu, Melepurath Deepa
Summary: The research investigates the impact of different electrolytes on the performance of a supercapacitor, with findings indicating that the aqueous H+-ion-based CSA electrolyte outperforms other electrolytes, displaying higher ionic conductivity and transport number for improved energy storage performance.
ACS APPLIED ENERGY MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Sathish Deshagani, Debanjan Maity, Aparajita Das, Melepurath Deepa
Summary: The study utilized a hierarchical heterostructure of NiMoO4PNiMnCo2O4 (Nmop NMCO) and PProDOT to construct a supercapacitor with high specific capacitance, cycle life, and energy density. Coupling the supercapacitor with an electrochromic device enabled efficient energy utilization and energy savings.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Electrochemistry
Ishita Naskar, Sathish Deshagani, Melepurath Deepa
Summary: The ASC constructed from zinc cobaltite micro-star shaped porous superstructure coated with zinc oxide nano stubs and coupled with porous flaky activated carbon from green tea exhibits greatly enhanced performance parameters, with increased specific capacitance, energy and power density. The sub-stoichiometry in the ZnO overlayer enhances electrical conductivity and overall electron circulation, leading to deep electrolyte penetration and sufficient ion-accommodation sites in the composite.
ELECTROCHIMICA ACTA
(2021)
Article
Engineering, Environmental
Ankita Kolay, Heather Flint, Elizabeth A. Gibson, Melepurath Deepa
Summary: This article introduces a tandem photoelectrochemical cell that can capture and convert visible light to near infrared light with high power conversion efficiency. The device consists of a nickel oxide photocathode sensitized with silver bismuth sulfide quantum dots, and a cadmium sulfide-sensitized titania photoanode. Trigonal-selenium sub-microtubes are anchored to the photoanode to enhance conductivity and increase device performance. The study provides insights into the charge flow mechanism in this unique device based on favorable energy level alignment.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Nanoscience & Nanotechnology
Dipti Umed Singh, Remya Narayanan
Summary: The incorporation of tungsten-doped VO2 and flexible 1D photonic crystals has been proposed for energy efficient smart windows. Tungsten doping can significantly reduce the phase transition temperature of VO2, while the use of flexible photonic crystals can modulate the changes in optical transmission. The combination of W-VO2 and DBR offers enhanced absorption and the ability to control solar heat flux in smart windows.
Article
Energy & Fuels
Ankita Kolay, Debanjan Maity, Heather Flint, Elizabeth A. Gibson, Melepurath Deepa
Summary: In this study, a cost-effective photoelectrochromic energy conversion unit for self-powered smart window applications was developed. It was found that coating silver nanowires on the V2O5 film can improve the electrochromic and electrochemical performance of the device, resulting in better optical contrast. The novel design of the photoelectrochromic and photovoltaic outputs showed high modulation efficiency and power conversion efficiency.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2022)
Article
Nanoscience & Nanotechnology
Debanjan Maity, Babneet Kaur, Partha Ghosal, Melepurath Deepa
Summary: A unique liquid junction solar cell (LJSC) architecture has been developed, incorporating p-type hole transporting CoS nanoflakes and n-type textured silicon, resulting in a high power conversion efficiency. The use of a ferrocene/ferrocenium redox couple electrolyte and an electrocatalytic counter electrode film anchored with antimony nanostructures on tungsten oxide further enhances the performance.
ACS APPLIED NANO MATERIALS
(2022)
Article
Energy & Fuels
Ishita Naskar, Partha Ghosal, Melepurath Deepa
Summary: In this study, a unique binder-free composite cathode ZnCo2S4@MgCo2O4 is reported, which exhibits high electrical conductivity, fast ion diffusion, and abundant electrolyte-electroactive site interactions, leading to excellent capacitance performance and cycle life. The effect of different electrolytes on the redox behavior is evaluated, and the potential application of this configuration in consumer-electronic-devices is demonstrated.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Chemistry, Physical
Sathish Deshagani, Ishita Naskar, Gaurav Ganesh Padval, Partha Ghosal, Melepurath Deepa
Summary: Semiconducting cobalt tungstate and zinc ferrite materials were used to fabricate a high-performance asymmetric supercapacitor (ASC) with high room-temperature electrical conductivities. The study also analyzed the effects of different electrolytes on the performance of the ASC.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Chemistry, Physical
Babneet Kaur, Souvik Naskar, Partha Ghosal, Melepurath Deepa
Summary: A non-aqueous zinc ion battery with a wide operational voltage window and high Coulombic efficiency was successfully fabricated. The battery overcomes structural instability and low electrical conductivity issues in both the cathode and the anode by using a conducting polymer layer. The cathode consists of VS4 nanoflowers and carbon nanotubes, outperforming pristine VS4 nanoflowers due to enhanced electrical conductivity, easy electron and ion transfer and transport, effective buffering of volume changes, and better accessibility of active sites. This work lays the foundation for developing zinc ion batteries with ultra-long lifespan and high energy density as advanced energy storage systems.
APPLIED SURFACE SCIENCE
(2023)
Review
Materials Science, Multidisciplinary
Pendyala Naresh Kumar, Aparajita Das, Ankita Kolay, Melepurath Deepa
Summary: This review discusses the strategies for developing low-cost quantum dot solar cells. By effectively utilizing passivation layers, alloyed QDs, and novel catalytic counter electrodes, the power conversion efficiencies have been significantly increased.
MATERIALS ADVANCES
(2022)
Article
Electrochemistry
Souvik Naskar, Melepurath Deepa
Summary: Utilizing a zinc vanadate@textured carbon (ZnV2O4@TC) composite cathode and Zn-anode in a non-aqueous zinc-ion battery (ZIB), along with a ZIF-8 metal-organic framework (MOF) layer at the separator facing the cathode, leads to improved cyclability, rate capability, stability, and durability of the battery system.
BATTERIES & SUPERCAPS
(2022)
Article
Electrochemistry
Anweshi Dewan, Sattwick Haldar, Remya Narayanan
Summary: A multi-shelled NiO hollow sphere was successfully synthesized, demonstrating enhanced active surface area and additional reactive sites for electrochromic devices and sensing applications. The geometry of the electrolyte ensures intimate contact between active sites and enhances ionic diffusion. Additionally, the material displayed excellent non-enzymatic glucose sensing performance.
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
(2021)