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Surface Treatment of Inorganic CsPbI_(3) Nanocrystals with Guanidinium Iodide for Efficient Perovskite Light-Emitting Diodes with High Brightness

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Nano-Micro Letters 2022年第4期14卷 277-288页

作者： Minh Tam Hoang Amandeep Singh Pannu Yang Yang Sepideh Madani Paul Shaw prashant sonar Tuquabo Tesfamichael Hongxia Wang Faculty of Science School of Chemistry and PhysicsQueensland University of TechnologyBrisbaneQLD 4001Australia Centre for Materials Science Queensland University of TechnologyBrisbaneQLD 4001Australia School of Mechanical Medical and Process EngineeringFaculty of EngineeringQueensland University of TechnologyBrisbaneQLD 4001Australia Centre for Organic Photonics&Electronics(COPE) School of Chemistry and Molecular BiosciencesThe University of QueenslandBrisbaneQLD 4072Australia

The remarkable evolution of metal halide perovskites in the past decade makes them promise for next-generation optoelectronic *** particular,nanocrystals(NCs)of inorganic perovskites have demonstrated excellent performance for light-emitting and display ***,the presence of surface defects on the NCs negatively impacts their performance in ***,we report a compatible facial post-treatment of CsPbI_(3) nanocrystals using guanidinium iodide(GuI).It is found that the GuI treatment effectively passivated the halide vacancy defects on the surface of the NCs while offering effective surface protection and exciton confinement thanks to the beneficial contribution of iodide and guanidinium *** a consequence,the film of treated CsPbI_(3) nanocrystals exhibited significantly enhanced luminescence and charge transport properties,leading to high-performance light-emitting diode with maximum external quantum efficiency of 13.8%with high brightness(peak luminance of 7039 cd m^(−2) and a peak current density of 10.8 cd A^(−1)).The EQE is over threefold higher than performance of untreated device(EQE:3.8%).The operational half-lifetime of the treated devices also was significantly improved with T50 of 20 min(at current density of 25 mA cm^(−2)),outperforming the untreated devices(T50~6 min).

关键词： CsPbI_(3)perovskites Nanocrystals Light-emitting diodes Photoluminescence Surface passivation Guanidinium iodide

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Tetramethylammonium Iodide Additive for Enhancing the Charge Carrier Mobilities of Diketopyrrolopyrrole-Based Conju-gated Polymer in Ambipolar Organic Field-Effect Transistors

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Chinese Journal of Chemistry 2023年第9期41卷 1028-1036页

作者： Waner He Qian Liu Sultan Otep Hidetoshi Matsumoto Sergei Manzhos prashant sonar Aung Ko Ko Kyaw Tsuyoshi Michinobu Department of Materials Science and Engineering Tokyo Institute of TechnologyTokyo 152-8552Japan Guangdong University Key Laboratory for Advanced Quantum Dot Displays Department of Electrical and Electronic EngineeringSouthern University of Science and TechnologyShenzhenGuangdong 518055China Center for Materials Science School of Chemistry and PhysicsFaculty of ScienceQueensland University of TechnologyBrisbaneQLD 4000Australia School of Materials and Chemical Technology Tokyo Institute of TechnologyTokyo 152-8552Japan

Diketopyrrolopyrrole(DPP)is one of the most promising building blocks for constructing polymer semiconductors with high charge-carrier mobilities in organic field-effect transistors(OFETs).In this study,a novel DPP-based conjugated polymer,PDPPy-BDD,was designed and *** ambipolar field-effect transistor characteristics were realized with the average hole and electron mobilities of 3.5×10^(-3)and 3.07×10^(-2)cm^(2)V^(-1)s^(-1),*** the hole and electron mobilities could be successfully en-hanced by using a tetramethylammonium iodide(NMe4l)*** an enhancement was attributed to the formation of stronger interchainπ-πstackings,the weakening of the face-on packing orientation in the thin film state,and the higher channel conductivi-ties in the OFETs.

关键词： Diketopyrrolopyrrole Pyridine Charge transport Conjugated polymers Organic field-effect transistors Semiconductors Tetramethylammonium iodide Thin films

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Flexible sensors based on hybrid materials

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Journal of Semiconductors 2020年第4期41卷 5-6页

作者： Zhihui Ren Dongchen Qi prashant sonar Zhongming Wei Institute of Semiconductors Chinese Academy of SciencesBeijing 100083China Centre for Materials Science School of Chemistry and PhysicsQueensland University of TechnologyBrisbane QLD 4001Australia

With the rapid development of mobile Internet and intelligent devices,flexible electronic technology has attracted wide attention driven by the huge demand of the *** one type of flexible electronic devices,flexible sensors have attracted great interest because of their promising prospects in artificial intelligence,medical health,and environmental *** recent years,flexible sensors with high sensitivity,selectivity,good deformability,reliable stability,and portability are urgently needed to meet the developments of artificial skin,human-computer interaction,point of care diagnostics and wearable electronic devices.

关键词： artificial computer flexible

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Current advancements on charge selective contact interfacial layers and electrodes in flexible hybrid perovskite photovoltaics

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Journal of Energy Chemistry 2021年第3期30卷 151-173页

作者： Gopalan Saianand prashant sonar Gregory J.Wilson Anantha-Iyengar Gopalan Vellaisamy A.L.Roy Gautam E.Unni Khan Mamun Reza Behzad Bahrami K.Venkatramanan Qiquan Qiao Global Centre for Environmental Remediation(CCER) Faculty of ScienceThe University of NewcastleCallaghan 2308New South WalesAustralia CSIRO Energy Newcastle Energy Centre10 Murray Dwyer CctMayfield WestNSW 2304Australia School of Chemistry and Physics Queensland University of Technology(QUT)2 George StreetBrisbaneQLD 4001Australia Centre for Material Science Queensland University of Technology(QUT)BrisbaneQLD 4000Australia Daegyeong Regional Infrastructure Technology Development Center Kyungpook National UniversityDaegu 41566Republic of Korea James Watt School of Engineering University of GlasgowG128QQUnited Kingdom Facufty of Engineering and Built Environment The University of NewcastleCallaghan 2308New South WalesAustralia Department of Electrical Engineering Center for Advanced PhotovoltaicsSouth Dakota State UniversityBrookings 57007South DakotaUSA Department of Physics SCSVMV Deemed UniversityKanchipuram 631561Tamil NaduIndia

Perovskite-based photovoltaic materials have been attracting attention for their strikingly improved performance at converting sunlight into *** beneficial and unique optoelectronic characteristics of perovskite structures enable researchers to achieve an incredibly remarkable power conversion *** hybrid perovskite photovoltaics promise emerging applications in a myriad of optoelectronic and wearable/portable device applications owing to their inherent intriguing physicochemical and photophysical properties which enabled researchers to take forward advanced research in this growing *** perovskite photovoltaics have attracted significant attention owing to their fascinating material properties with combined merits of high efficiency,light-weight,flexibility,semitransparency,compatibility towards roll-to-roll printing,and large-area mass-scale *** perovskite-based solar cells comprise of 4 key components that include a flexible substrate,semi-transparent bottom contact electrode,perovskite(light absorber layer)and charge transport(electron/hole)layers and top(usually metal)*** these components,interfacial layers and contact electrodes play a pivotal role in influencing the overall photovoltaic *** this comprehensive review article,we focus on the current developments and latest progress achieved in perovskite photovoltaics concerning the charge selective transport layers/electrodes toward the fabrication of highly stable,efficient flexible *** a concluding remark,we briefly summarize the highlights of the review article and make recommendations for future outlook and investigation with perspectives on the perovskite-based optoelectronic functional devices that can be potentially utilized in smart wearable and portable devices.

关键词： Perovskite photovoltaics Charge transport layers Contact interface layer Contact electrodes Printable electronics

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Synthesis and Characterization of Novel Organic Semiconductors

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复旦学报（自然科学版） 2007年第5期46卷 594-页

作者： prashant sonar Samarendra P.Singh Ananth Dodabalapur Alan Sellinger Institute of Materials Research and Engineering 3 Research Link Singapore 117602 Republic of Singapore Institute of Materials Research and Engineering 3 Research Link Singapore 117602 Republic of SingaporeThe University of Texas at Austin Austin TX USA

1 Results Development of new organic semiconductors for use in low-cost,large-area applications is very important for growth of the organic electronic *** non-polymer based organic semiconductors can be roughly classified into linear,star-shaped,branched or lamellar molecules on the basis of their shape[1]. Generally hole (p-type) and electron (n-type) transporting semiconductors have been prepared from electron donating and accepting π-systems respectively[2]. These materials can be used ...

关键词： organic semiconductor benzothiadiazole pyrene derivatives

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Versatile aza-BODIPY-based low-bandgap conjugated small molecule for light harvesting and near-infrared photodetection

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InfoMat 2022年第12期4卷 112-127页

作者： Gurudutt Bhat Marcin Kielar Haixia Rao Mahnaz D.Gholami Isabel Mathers Astrid C.R.Larin Thomas Flanagan Enkhtur Erdenebileg Annalisa Bruno Amandeep Singh Pannu Kathryn E.Fairfull-Smith Emad L.Izake Pankaj Sah Yeng Ming Lam Ajay K.Pandey prashant sonar School of Chemistry Physicsand Centre for Materials ScienceQueensland University of TechnologyBrisbaneQueenslandAustralia School of Electrical Engineering and Robotics Queensland University of TechnologyBrisbaneQueenslandAustralia Queensland Brain Institute The University of QueenslandSt LuciaQueenslandAustralia School of Materials Science and Engineering Nanyang Technological UniversitySingaporeSingapore Energy Research Institute@NTU(ERI@N) Nanyang Technological UniversitySingaporeSingapore

The versatile nature of organic conjugated materials renders their flawless integration into a diverse family of optoelectronic devices with light-harvesting,photodetection,or light-emitting *** of materials that offer the possibilities of two or more distinct optoelectronic functions are particularly attractive as they enable smart applications while providing the benefits of the ease of fabrication using low-cost ***,we develop a novel,multi-purpose conjugated small molecule by combining boron-azadipyrromethene(aza-BODIPY)as electron acceptor with triphenylamine(TPA)as end-capping donor *** implemented donor–acceptor–donor(D–A–D)configuration,in the form of TPA-azaBODIPY-TPA,preserves ideal charge transfer characteristics with appropriate excitation energy levels,with the additional ability to be used as either a charge transporting interlayer or light-sensing semiconducting layer in optoelectronic *** demonstrate its versatility,we first show that TPA-azaBODIPY-TPA can act as an excellent hole transport layer in methylammonium lead triiodide(MAPbI3)-based perovskite solar cells with measured power conversion efficiencies exceeding 17%,outperforming control solar cells with PEDOT:PSS by nearly 60%.Furthermore,the optical bandgap of 1.49 eV is shown to provide significant photodetection in the wavelength range of up to 800 nm where TPA-azaBODIPY-TPA functions as donor in near-infrared organic photodetectors(OPDs)composed of fullerene ***,the established versatility of TPA-azaBODIPY-TPA,combined with its robust thermal stability as well as excellent solubility and processability,provides a new guide for developing highly efficient multi-purpose electronic materials for the next-generation of smart optoelectronic devices.

关键词： BODIPY multifunctionality organic photodetector perovskite solar cell TPA TPA-azaBODIPY-TPA

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Magnification:The game changer in dentistry

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World Journal of Methodology 2025年第2期15卷 74-82页

作者： Sachin Chauhan Radha Chauhan prashant Bhasin Meenu Bhasin Department of Conservative Dentistry and Endodontics Sudha Rustagi College of Dental Sciences and ResearchFaridabad 121002India Department of Prosthodontics and Crown and Bridge and Oral Implantology Mahatma Gandhi Dental College and HospitalJaipur 302022India Department of Periodontics Sudha Rustagi College of Dental Sciences and ResearchFaridabad 121002India

During dental examinations and treatments,many dentists are using magni-fication to improve their *** dental operating microscope serves as the most effective tool for this purpose,enhancing the quality,longevity,and outcome of clinical *** review will explore the latest research and data on the importance of magnification devices in dentistry,including diagnostic methods,treatment options and ergonomics in specialities such as restorative dentistry,endodontics,pedodontics,periodontics,and *** review aims to provide insights into the optimal magnification for different clinical situations,the specific benefits of dental operating microscopes for each dental branch,and their limitations.

关键词： Magnification Vision Endodontics Dentistry Dental operating microscope

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Present status and future directions:Apexification

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World Journal of Methodology 2025年第1期15卷 26-32页

作者： Sachin Chauhan Radha Chauhan prashant Bhasin Bhavna G Sharaf Department of Conservative Dentistry and Endodontics Sudha Rustagi College of Dental Sciences and ResearchFaridabad 121002HaryanaIndia Department of Prosthodontics and Crown and Bridge and Oral Implantology Mahatma Gandhi Dental College&HospitalJaipur 302022RajasthanIndia Department of Pedodontics and Preventive Dentistry Sudha Rustagi College of Dental Sciences and ResearchFaridabad 121002HaryanaIndia

The success rate of apexification is primarily determined by multiple factors,including the material used,the size of the open apex compared to the length of the root,and the technique used in each *** main objective of this review was to provide an update on the present management of open apex to identify factors and circumstances that may influence the success of apexification using different materials and *** research on apexification should focus on how to treat open apices with wide periapical lesions without ***,the predictability of these parameters with non-surgical procedures was uncertain,but now,with the use of a dental operating microscope,it has become more *** reason could be that extra visits are no longer required due to major advances in the armamentarium and materials used for apexification.

关键词： Bioceramics Magnification Biodentine Mineral trioxide aggregate Apexification Open apex

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Comparative efficacy of hyperbaric bupivacaine vs hyperbaric ropivacaine in spinal anesthesia for cesarean section:A metaanalysis

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World Journal of Methodology 2025年第2期15卷 154-165页

作者： Rishi Anand Deb Sanjay Nag Roushan Patel prashant Sharma Vamsi Krishna Uppalapati Umesh Kumar Singh Department of Anaesthesiology Tata Main HospitalJamshedpur 831001JhārkhandIndia

BACKGROUND Intrathecal bupivacaine is the traditional anesthetic drug used in spinal anesthesia for caesarean sections(CSs),but ropivacaine has emerged as a potential *** meta-analysis compares the efficacy and safety of intrathecal hyper-baric bupivacaine vs hyperbaric ropivacaine for cesarean *** To systematically evaluate and compare the efficacy and safety of intrathecal hyperbaric bupivacaine and hyperbaric ropivacaine for spinal anesthesia in *** A thorough search of electronic databases was carried out to find pertinent randomized controlled trials(RCTs)comparing intrathecal hyperbaric ropi-vacaine and hyperbaric bupivacaine during ***,Cochrane database,Google Scholar,and Scopus were searched,and papers from January 2000 to January 2024 were deemed eligible and filtered using predetermined inclusion and exclusion *** were assessed for methodological quality,and data were extracted for time to adequate anesthesia(sensory and motor blockade),duration of sensory and motor block,hemodynamic changes and side effect *** standardized mean difference with 95%CI was used for continuous *** variables were assessed using the Mantel-Haenszel test and the random effect model to compute the odds *** Total 8 RCTs were selected from a pool of 119 search results for *** meta-analysis evaluated pooled effect sizes and assessed heterogeneity among the *** primary objective was to compare key outcomes to identify any significant variances in efficacy and safety profiles between two local *** analysis revealed that the difference in the onset of sensory blockade between the two local anesthetics was statistically insignificant(P=0.1586).However,the onset of motor blockade appeared to be faster with bupivacaine(P=0.03589).Additionally,the regression of sensory and motor blockade occurred earlier in the ropivacaine ***,the duration of the first analgesic

关键词： Ropivacaine Bupivacaine Anesthesia Spinal Cesarean section Meta-analysis

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Liver transplantation and resection in patients with hepatocellular cancer and portal vein tumor thrombosis: Feasible and effective?

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Hepatobiliary & Pancreatic Diseases International 2024年第2期23卷 123-128页

作者： prashant Bhangui Institute of Liver Transplantation and Regenerative Medicine Medanta–The MedicitySector 38GurgaonDelhi NCR 122001India

Patients with locally advanced hepatocellular cancer(HCC)and portal vein tumor thrombosis(PVTT)have a dismal prognosis since limited treatment options are available for *** recent years,effective systemic therapy,and advances in the understanding of technicalities and effectiveness of ablative therapies especially radiotherapy,have given some hope to prolong survival in *** review summarized recent evidence in literature regarding the possible role of liver resection(LR)and liver transplantation(LT)in patients with locally advanced HCC and PVTT with no extrahepatic *** therapies have helped make curative resection or LT a reality in selected *** review emphasizes on the key points to focus on when considering surgery in these patients,who are usually relegated to palliative systemic therapy *** patient selection based on tumor biology,documented downstaging based on imaging and decrease in tumor marker levels,and an adequate waiting period to demonstrate stable disease,may help obtain satisfactory long-term outcomes post LR or LT in an intention to treat strategy in patients with HCC and PVTT.

关键词： Hepatocellular carcinoma Portal vein tumour thrombosis Downstaging therapies Living donor liver transplantation and resection Outcomes

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