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Solution processed high performance perovskite quantum dots/ZnO phototransistors

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Nano Research 2022年第4期15卷 3660-3666页

作者： Md Mehedi Hasan Eric Moyen Jewel Kumer Saha Md Mobaidul Islam Arqum Ali Jin Jang Advanced Display Research Center(ADRC) Department of Information DisplayKyung Hee University26Kyungheedae-roDongdaemun-guSeoul 02447Republic of Korea

Phototransistors that can detect visible light have been fabricated using solution processed zinc oxide channel/zirconium oxide gate insulator thin film transistors(TFTs)and room temperature synthesized perovskite quantum dots(PeQDs)as active layer.Typical ZnO thin film transistors did not show a photocurrent under visible light illumination.However,ZnO TFTs decorated with PeQDs exhibited enhanced photocurrent upon exposure to visible light.The device had a responsivity of 567 A/W(617 A/W),a high detectivity of 6.59×10^(13)Jones(1.85×10^(14)J)and a high sensitivity of 10^(7)(10^(8))under green(blue)light at a low drain voltage of 0.1 V.The high photo-responsivity and detectivity under green light resulted from the combination of short ligands in the QDs films and the high mobility of the spray coated ZnO films.Those results are relevant for the development of low cost and low energy consumption phototransistors working in the visible range.

关键词： ZnO thin film transistors perovskite quantum dots photo-detectors photo-transistors

Ligand engineering of perovskite quantum dots for efficient and stable solar cells

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Journal of Energy Chemistry 2022年第6期31卷 626-648,I0018页

作者： Shanshan Ding Mengmeng Hao Tongen Lin Yang Bai Lianzhou Wang School of Chemical Engineering and Australian Institute of Bioengineering and Nanotechnology The University of QueenslandBrisbaneQLD 4072Australia

Lead halide perovskite quantum dots(PQDs) have recently emerged as promising light absorbers for photovoltaic application due to their extraordinary optoelectronic properties. Surface ligands are of utmost importance for the colloidal stability and property tuning of PQDs, while their highly dynamic binding nature not only impedes further efficiency improvement of PQD-based solar cells but also induces intrinsic instability. Tremendous efforts have been made in ligand engineering with good hopes to solve such challenging issues in the past few years. In this review, we first present a fundamental understanding of the role of surface ligands in PQDs, followed by a brief discussion and classification of various ligands that have the potential for improving the electronic coupling and stability of PQD solids. We then provide a critical overview of recent advances in ligand engineering including the strategies of in-situ ligand engineering, postsynthesis/-deposition ligand-exchange, and interfacial engineering, and discuss their impacts on changing the efficiency and stability of perovskite QD solar cells(QDSCs). Finally, we give our perspectives on the future directions of ligand engineering towards more efficient and stable perovskite QDSCs.

关键词： perovskite quantum dots Ligand engineering Defect passivation Solar cells Stability

Dual-stimuli responsive photonic barcodes based on perovskite quantum dots encapsulated in whispering-gallery-mode microspheres

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Journal of Materiomics 2023年第3期9卷 423-430页

作者： Baoyuan Xu Shuo Yang Xingwei Feng Tongjin Zhang Zhenhua Gao Yong Sheng Zhao School of Materials Science&Engineering Qilu University of Technology(Shandong Academy of Sciences)3501 Daxue RoadChangqing DistrictJinan250353Shandong ProvinceChina Key Laboratory of Photochemistry Institute of ChemistryChinese Academy of SciencesBeijing100190China

Micro/nanoscale photonic barcodes hold great potential for broad applications in items tracking,mul-tiplexed bioassays and anti-counterfeiting.The ever-increasing demand in advanced anti-counterfeiting applications calls for micro/nanoscale barcodes with accurate recognition,large encoding capacity and high security level.Here,we proposed a strategy to construct the dual-stimuli responsive photonic barcodes based on the perovskite quantum dots(PQDs)doped polymer whispering-gallery-mode(WGM)microcavities via swelling-deswelling method.Benefiting from the well-defined spherical microcavities,the photoluminescence(PL)spectra of as-prepared composites exhibit a series of sharp peaks characteristics resulting from the effective WGM modulation,which constitutes the fingerprint of a specific resonator and thus allows a definition of photonic barcodes.On this basis,we achieved responsive photonic barcodes based on the volatile polar-solvent-controlled luminescence in the mi-crospheres benefitting from the space-confined microcavities and the ionic feature of the PQDs.More-over,the light-controlled photonic barcodes have further been acquired through reversibly regulating the inactivation and activation of the energy transfer(ET)process between the PQDs and photochromic dyes.The well-established protocols of PQDs@WGM enable the development of distinct responsive barcodes with multi-responsive features,which will pave an avenue to new types of flexible WGM-based components for optical data recording and security labels.

关键词： Responsive photonic barcodes perovskite quantum dots Whispering-gallery-mode microsphere Anti-counterfeiting

Electron beam pumping improves the conversion efficiency of low-frequency photons radiated by perovskite quantum dots

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Chinese Physics B 2023年第4期32卷 754-761页

作者：杜鹏母一宁任航 Idelfonso Tafur Monroy 李彦正樊海波王帅 Makram Ibrahim 梁栋 School of Physics Changchun University of Science and TechnologyChangchun 130022China Institute for Photonic Integration Eindhoven University of TechnologyEindhoven 5600 MBNetherlands Science and Technology on Low-Light-Level Night Vision Laboratory Xi’an 710018China Kunming Institute of Physics Kunming 650221China Solar and Space Research Department National Research Institute of Astronomy and Geophysics(NRIAG)Cairo 11421Egypt

This research argues that using an electron beam with high kinetic energy to pump perovskite quantum dots can significantly boost the efficiency of the low-frequency photon radiation conversion.Firstly,we measure the random lasing threshold and luminescence threshold of CsPbX_(3)films pumped by an electron beam.Then,we simulate the spatial distribution of the electron beams in CsPbX_(3)films.Combined with the above data,a low-frequency photon radiation conversion model based on the electron pumped perovskite quantum dots is presented.This could be a way to create a terahertz source with a high-power output or to multiply the terahertz power.

关键词： electron beam perovskite quantum dots THz

Coarse and fine-tuning of lasing transverse electromagnetic modes in coupled all-inorganic perovskite quantum dots

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Nano Research 2021年第1期14卷 108-113页

作者： Youngsin Park Guanhua Ying Atanu Jana Vitaly Osokin Claudius C.Kocher Tristan Farrow Robert A.Taylor Kwang S.Kim School of Natural Science Ulsan National Institute of Science and TechnologhUlsan 44919Republic of Korea Clarendon Laboratory Department of PhysicsUniversity of OxfordParks RoadOxford OX13PUUK Centre for quantum Technologies National University of SingaporeScience Drive 2Singapore 117543Singapore

Inorganic perovskite lasers are of particular interest,with much recent work focusing on Fabry-P6rot cavity-forming nanowires.We demonstrate the direct observation of lasing from transverse electromagnetic(TEM)modes with a long coherence time-9.5ps in coupled CsPbBr_(3) quantum dots,which dispense with an external cavity resonator and show how the wavelength of the modes can be controlled via two independent tuning-mechanisms.Controlling the pump power allowed us tofine-tune the TEM mode structure to the emission wavelength,thus providing a degree of control over the properties of the lasing signal.The temperature-tuning provided an additional degree of control over the wavelength of the lasing peak,importantly,maintained a constant full width at half maximum(FWHM)over the entire tuning range without mode-hopping.

关键词： perovskite quantum dots coherent lasing transverse electromagnetic mode stimulated emission

Embedding lead halide perovskite quantum dots in carboxybenzene microcrystals improves stability

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Nano Research 2017年第8期10卷 2692-2698页

作者： Wei Xu Zhixiong Cai Feiming Li Jing Dong Yiru Wang Yaqi Jiang Xi Chen Deportment of Chemistry and the MOE Key Laboratory of Spectrochemical Analysis & Instrumentation College of Chemistry and Chemical Engineering Xiamen University Xiamen 361005 China State Key Laboratory of Marine Environmental Science Xiamen University Xiamen 361005 China

The stability of lead halide perovskite quantum dots （PQDs） was improved by embedding them in carboxybenzene microcrystals. The resulting needle-shaped mixed microcrystals preserved the strong photoluminescence of the PQDs. Compared with previously reported polystyrene-encapsulated PQDs, the carboxybenzene crystals were robust and protected the dots from moisture and photodegradation. The enhanced stability was attributed to the tight matrix of carboxybenzene microcrystals, which protected the PQDs from moisture. This versatile strategy protected various QDs, including all-inorganic PQDs and chalcogenide QDs （e.g., CdSe/ZnS QDs and CuInS/ZnS QDs）. It provides a facile and versatile method of protecting PQDs and may enable applications in solid-state systems with high color quality requirements such as displays, lasers, and light emitting diodes.

关键词： perovskite nanocrystals perovskite quantum dots down-conversion white LEDs carboxybenzene crystals

In-situ synthesis of stable perovskite quantum dots in core-shell nanofibers via microfluidic electrospinning

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Chinese Chemical Letters 2023年第3期34卷 518-521页

作者： Rui Cheng Zhi-Bin Liang Haixia Shen Jiazhuang Guo Cai-Feng Wang Su Chen State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical Engineeringand Jiangsu Key Laboratory of Fine Chemicals and Functional Polymer MaterialsNanjing Tech UniversityNanjing 210009China

perovskite quantum dots(PQDs) possess remarkable optical properties, such as tunable photoluminescence(PL) emission spectra, narrow full width at half maximum(FWHM) and high PL quantum yield(QY), endowing the PQDs great application prospects. However, the inherent structural instability of PQDs has seriously hindered the application of PQDs in various photoelectric devices. In this work, a microfluidic electrospinning method was used to fabricate color-tunable fluorescent formamidinium lead halogen(FAPbX_(3), X = Cl, Br, I) PQDs/polymer core-shell nanofiber films. The core-shell spinning nanofiber not only supplies the interspace for the in-situ formation of PQDs, but also significantly reduces the permeability of moisture and oxygen in the air, which greatly improves the stability of PQDs. After adjusting the composition of precursors, the blue-emissive polystyrene(core) and polymethyl methacrylate(shell) coated FAPbCl_(3) QDs(abbreviated as PS/FAPbCl_(3)/PMMA, hereinafter), green-emissive PS/FAPbBr_(3)/PMMA and redemissive PS/FAPbI_(3)/PMMA nanofiber films were fabricated with the highest PL QY of 82.3%. Moreover,the PS/FAPbBr_(3)/PMMA nanofiber film exhibits great PL stability under blue light irradiation, long-term storage in the air and water resistance test. Finally, the green-and red-emissive nanofiber films were directly applied as light conversion films to fabricate wide-color-gamut display with the color gamut of 125%, indicating their tremendous potentials in optoelectronic applications.

关键词： perovskite quantum dots Microfluidic electrospinning Nanofiber PL stability Display

Photoresponsive characteristics of thin film transistors with perovskite quantum dots embedded amorphous InGaZnO channels

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Chinese Physics B 2020年第7期29卷 588-595页

作者：张美娜邵龑王晓琳吴小晗刘文军丁士进 State Key Laboratory of ASIC and System School of MicroelectronicsFudan UniversityShanghai 200433China Center for Information Photonics and Energy Materials Shenzhen Institutes of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China

Photodetectors based on amorphous InGaZnO(a-IGZO)thin film transistor(TFT)and halide perovskites have attracted attention in recent years.However,such a stack assembly of a halide perovskite layer/an a-IGZO channel,even with an organic semiconductor film inserted between them,easily has a very limited photoresponsivity.In this article,we investigate photoresponsive characteristics of TFTs by using CsPbX3(X=Br or I)quantum dots(QDs)embedded into the a-IGZO channel,and attain a high photoresponsivity over 10^3A·W^-1,an excellent detectivity in the order of 10^16 Jones,and a light-to-dark current ratio up to 10^5 under visible lights.This should be mainly attributed to the improved transfer efficiency of photoelectrons from the QDs to the a-IGZO channel.Moreover,spectrally selective photodetection is demonstrated by introducing halide perovskite QDs with different bandgaps.Thus,this work provides a novel strategy of device structure optimization for significantly improving the photoresponsive characteristics of TFT photodetectors.

关键词： perovskite quantum dots a-IGZO thin-film transistor photoresponsive characteristics

配体密度控制促进CsPbBr_(3)量子点激子解离与能量转移实现高效CO_(2)光催化还原

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Science Bulletin 2024年第7期69卷 901-912页

作者：钟丰忆盛剑平杜晨宇何烨孙艳娟董帆 School of Resources and Environment University of Electronic Science and Technology of ChinaChengdu 611731China Research Center for Carbon-Neutral Environmental&Energy Technology Institute of Fundamental and Frontier SciencesUniversity of Electronic Science and Technology of ChinaChengdu 611731China

perovskite quantum dots(PQDs) hold immense potential as photocatalysts for CO_(2) reduction due to their remarkable quantum properties,which facilitates the generation of multiple excitons,providing the necessary high-energy electrons for CO_(2) photoreduction.However,harnessing multi-excitons in PQDs for superior photocatalysis remains challenging,as achieving the concurrent dissociation of excitons and interparticle energy transfer proves elusive.This study introduces a ligand density-controlled strategy to enhance both exciton dissociation and interparticle energy transfer in CsPbBr_(3) PQDs.Optimized CsPbBr_(3) PQDs with the regulated ligand density exhibit efficient photocatalytic conversion of CO_(2) to CO,achieving a 2.26-fold improvement over unoptimized counterparts while maintaining chemical integrity.Multiple analytical techniques,including Kelvin probe force microscopy,temperaturedependent photoluminescence,femtosecond transient absorption spectroscopy,and density functional theory calculations,collectively affirm that the proper ligand termination promotes the charge separation and the interparticle transfer through ligand-mediated interfacial electron coupling and electronic interactions.This work reveals ligand density-dependent variations in the gas-solid photocatalytic CO_(2) reduction performance of CsPbBr_(3) PQDs,underscoring the importance of ligand engineering for enhancing quantum dot photocatalysis.

关键词： perovskite quantum dots Ligands Photocatalytic CO_(2)reduction Exciton dissociation Electronic coupling