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High Sensitivity Submicron Scale Temperature Sensor Based on Perovskite Nanoplatelet Lasers

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发光学报 2024年第9期45卷 1511-1520页

作者： ZHAO Ruofan TAO Jianxun XI Yuying chen jiangzhao JI Ting WANG Wenyan WEN Rong CUI Yanxia chen Junsheng LI Guohui College of Electronic Information and Optoelectronic Engineering Taiyuan University of TechnologyTaiyuan 030024China School of Materials Science and Engineering Kunming University of Science and TechnologyKunming 650093China Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering Taiyuan 030024China Nano-Science Center&Department of Chemistry University of CopenhagenCopenhagen DK-2100Denmark

Submicron scale temperature sensors are crucial for a range of applications,particularly in micro and na-noscale *** promising solution involves the use of active whispering gallery mode(WGM)*** resonators can be remotely excited and read out using free-space structures,simplifying the process of *** this study,we present a submicron-scale temperature sensor with a remarkable sensitivity up to 185 pm/℃based on a trian-gular MAPbI3 nanoplatelet(NPL)***,as temperature changes,the peak wavelength of the laser line shifts *** unique characteristic allows for precise temperature sensing by tracking the peak wavelength of the NPL *** optical modes are confined within the perovskite NPL,which measures just 85 nm in height,due to total internal *** NPL laser boasts several key features,including a high Q of~2610 and a low laser threshold of about 19.8μJ·cm^(−2).The combination of exceptional sensitivity and ultra-small size makes our WGM device an ideal candidate for integration into systems that demand compact temperature *** advancement paves the way for significant prog-ress in the development of ultrasmall temperature sensors,opening new possibilities across various fields.

关键词： temperature sensor submicron scale perovskite nanoplatelet

Stabilizing Buried Interface via Synergistic Effect of Fluorine and Sulfonyl Functional Groups Toward Efficient and Stable Perovskite Solar Cells

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Nano-Micro Letters 2023年第2期15卷 32-45页

作者： cheng Gong Cong Zhang Qixin Zhuang Haiyun Li Hua Yang jiangzhao chen Zhigang Zang Key Laboratory of Optoelectronic Technology and Systems(Ministry of Education) Chongqing UniversityChongqing 400044People’s Republic of China Institute of High Energy Physics Chinese Academy of Sciences(CAS)Beijing 100049People’s Republic of China

The interfacial defects and energy barrier are main reasons for interfacial nonradiative *** addition,poor perovskite crystallization and incomplete conversion of PbI_(2) to perovskite restrict further enhancement of the photovoltaic performance of the devices using sequential ***,a buried interface stabilization strategy that relies on the synergy of fluorine(F)and sulfonyl(S=O)functional groups is proposed.A series of potassium salts containing halide and non-halogen anions are employed to modify SnO_(2)/perovskite buried *** chemical bonds including hydrogen bond,coordination bond and ionic bond are realized,which strengthens interfacial contact and defect passivation *** chemical interaction between modification molecules and perovskite along with SnO_(2) heightens incessantly as the number of S=O and F *** chemical interaction strength between modifiers and perovskite as well as SnO_(2) gradually increases with the increase in the number of S=O and *** defect passivation effect is positively correlated with the chemical interaction *** crystallization kinetics is regulated through the compromise between chemical interaction strength and wettability of *** with Cl−,all non-halogen anions perform better in crystallization optimization,energy band regulation and defect *** device with potassium bis(fluorosulfonyl)imide achieves a tempting efficiency of 24.17%.

关键词： Perovskite solar cells Buried interface Multiple chemical bonds Synergistic effect of functional groups Defect passivation

Ion diffusion-induced double layer doping toward stable and efficient perovskite solar cells

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Nano Research 2022年第6期15卷 5114-5122页

作者： Qixin Zhuang Huaxin Wang Cong Zhang cheng Gong Haiyun Li jiangzhao chen Zhigang Zang Key Laboratory of Optoelectronic Technology&Systems(Ministry of Education) Chongqing UniversityChongqing 400044China

The perovskite layer,electron transport layer(ETL)and their interface are closely associated with carrier transport and extraction,which possess a pronounced effect on current ***,the dissatisfactory electric properties of functional layers pose a serious challenge for maximizing the thermodynamic potential of current density of perovskite solar cells(PSCs).Herein,we report an ion diffusion-induced double layer doping strategy for efficient and stable PSCs,where LiOH is directly added into SnO_(2)colloidal dispersion *** is uncovered that a small amount of Li+ions remain in the ETL and doped SnO2 while a large amount of Li+ions diffuse to SnO_(2)/perovskite interface and into perovskite layer and gradient concentration distribution is spontaneously *** Li+ion doping endows both perovskite and SnO_(2)layers improved electric properties,which contributes to facilitated carrier transport and ***,the crystallinity and grain size of perovskite films are enhanced after *** doped device delivers a higher power conversion efficiency(PCE)of 21.31%together with improved ambient stability in comparison with the control device(PCE=19.26%).This work demonstrates a simple and effective ion diffusion-induced double layer by chemical doping strategy to advance the development of perovskite photovoltaics.

关键词： perovskite electron transport layer electron extraction SnO_(2)

Passivating buried interface with multifunctional novel ionic liquid containing simultaneously fluorinated anion and cation yielding stable perovskite solar cells over 23% efficiency

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Journal of Energy Chemistry 2022年第6期31卷 659-666,I0018页

作者： Deyu Gao Liqun Yang Xiaohui Ma Xueni Shang chen Wang Mengjia Li Xinmeng Zhuang Boxue Zhang Hongwei Song jiangzhao chen Cong chen School of Material Science and Engineering State Key Laboratory of Reliability and Intelligence of Electrical EquipmentHebei University of TechnologyTianjin 300130China State Key Laboratory of Integrated Optoelectronics College of Electronic Science and EngineeringJilin UniversityChangchun 130012JilinChina Chimie ParisTech PSL Research UniversityCNRSInstitut de Recherche de Chimie Paris(IRCP)UMR824711 rue P.et M.CurieF-75005 ParisFrance Key Laboratory of Optoelectronic Technology&Systems(Ministry of Education) College of Optoelectronic EngineeringChongqing UniversityChongqing 400044China

Interfacial defects and energy barrier would result in serious interfacial non-radiative recombination *** addition,the quality of perovskite films is highly dependent on deposition ***,there is an urgent desire to develop multifunctional interface modulators to manage the interface between electron transport layer and perovskite ***,we report a multifunctional buried interface modulation strategy that 4-fluoro-phenylammonium tetrafluoroborate (FBABF_(4)) consisting of simultaneously fluorinated anion and cation is inserted between SnO_(2)layer and perovskite *** is uncovered by time-of-flight secondary ion mass spectroscopy that the anion and cation in modifier are mainly located at this interface,which is put down to coordination bond of the fluorine atom on BF_(4)^(-) with SnO_(2),and the hydrogen bond of the fluorine atom on FBA^(+) with *** suggests that simultaneous fluorination of anion and cation in the ionic liquid molecule is of crucial importance to ameliorate interfacial contact through chemical *** interface modification approach enables the realization of interfacial defect passivation,interfacial energy band alignment modulation,and perovskite crystallization manipulation,which are translated into enhanced efficiency and stability as well as significantly suppressed *** multiple functions of FBABF_(4) endow the modified solar cells excellent photovoltaic performance with an efficiency exceeding 23%along with appealing long-term *** work highlights the critical role of fluorination strategy in engineering multifunctional organic salt modulators for improving interfacial contact.

关键词： Perovskite solar cells Interface engineering Buried interface Ionic liquid Multifunctional

Unraveling abnormal buried interface anion defect passivation mechanisms depending on cation-induced steric hindrance for efficient and stable perovskite solar cells

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Journal of Energy Chemistry 2023年第5期80卷 1-9,I0001页

作者： Dongmei He Ru Li Baibai Liu Qian Zhou Hua Yang Xuemeng Yu Shaokuan Gong Xihan chen Baomin Xu Shangfeng Yang jiangzhao chen Key Laboratory of Optoelectronic Technology&Systems(Ministry of Education) College of Optoelectronic EngineeringChongqing UniversityChongqing 400044China Institute of High Energy Physics Chinese Academy of Sciences(CAS)Bejing 100049Chin SUSTech Energy Institute for Carbon Neutrality Department of Mechanical and Energy EngineeringSouthern University of Science and TechnologyShenzhen 518055GuangdongChin Department of Materials Science and Engineering Southern University of Science and TechnologyShenzhen 518055GuangdongChina CAS Key Laboratory of Materials for Energy Conversion Department of Materials Science and EngineeringUniversity of Science and Technology of ChinaHefei 230026AnhuiChina

Although ionic liquids(ILs)have been widely employed to heal the defects in perovskite solar cells(PSCs),the corresponding defect passivation mechanisms are not thoroughly understood up to ***,we first reveal an abnormal buried interface anion defect passivation mechanism depending on cationinduced steric *** IL molecules containing the same anion([BF4]^(-))and different sizes of imidazolium cations induced by substituent size are used to manipulate buried *** was revealed what passivated interfacial defects is mainly anions instead of *** and experimental results demonstrate that the large-sized cations can weaken the ionic bond strength between anions and cations,and facilitate the interaction between anions and SnO2as well as perovskites,which is conducive to interfacial defect passivation and ameliorating interfacial *** can be concluded that interfacial chemical interaction strength and defect passivation effect are positively correlated with the size of *** discovery breaks conventional thinking that large-sized modification molecules would weaken their chemical interaction with *** with the control device(21.54%),the device based on 1,3-Bis(1-adamantyl)-imidazolium tetrafluoroborate(BAIMBF4)with maximum size cations achieves a significantly enhanced efficiency of 23.61%along with much increased moisture,thermal and light stabilities.

关键词： Perovskite solar cells Buried interface Ionic liquid Anion defect passivation mechanism Cation-induced steric hindrance

Simultaneous passivation of bulk and interface defects through synergistic effect of anion and cation toward efficient and stable planar perovskite solar cells

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Journal of Energy Chemistry 2021年第12期30卷 452-460,I0011页

作者： Cong Zhang Huaxin Wang Haiyun Li Qixin Zhuang cheng Gong Xiaofei Hu Wensi Cai Shuangyi Zhao jiangzhao chen Zhigang Zang Key Laboratory of Optoelectronic Technology&Systems(Ministry of Education) Chongqing UniversityChongqing 400044.China

Bulk and interface carrier nonradiative recombination losses impede the further improvement of power conversion efficiency(PCE)and stability of perovskite solar cells(PSCs).It is highly necessary to develop multifunctional strategy to minimize surface and interface nonradiative recombination ***,we report a bulk and interface defect passivation strategy via the synergistic effect of anions and cations,where multifunctional potassium sulphate(K_(2)SO_(4))is incorporated at SnO_(2)/perovskite *** find that K^(+)ions in K_(2)SO_(4)diffuse into perovskite layer and suppress the formation of bulk defects in perovskite films,and the SO_(4)^(2-)ions remain located at interface via the strong chemical interaction with SnO_(2)layer and perovskite layer,*** this synergistic modification strategy,effective defect passivation and improved energy band alignment are achieved *** beneficial effects are translated into an efficiency increase from 19.45%to 21.18%with a low voltage deficit of0.53 V mainly as a result of boosted open-circuit voltage(V_(oc))after K_(2)SO_(4)*** addition,the K_(2)SO_(4)modification contributes to ameliorated *** present work provides a route to minimize bulk and interface nonradiative recombination losses for the simultaneous realization of PCE and stability enhancement by rational anion and cation synergistic engineering.

关键词： Perovskite solar cells Interface engineering K_(2)SO_(4) Defect passivation Energy band alignment

Bottom-up holistic carrier management strategy induced synergistically by multiple chemical bonds to minimize energy losses for efficient and stable perovskite solar cells

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Journal of Energy Chemistry 2023年第1期76卷 277-287,I0008页

作者： Baibai Liu Ru Li Qixin Zhuang Xuemeng Yu Shaokuan Gong Dongmei He Qian Zhou Hua Yang Xihan chen Shirong Lu Zong-Xiang Xu Zhigang Zang jiangzhao chen Key Laboratory of Optoelectronic Technology&Systems(Ministry of Education) College of Optoelectronic EngineeringChongqing UniversityChongqing 400044China SUSTech Energy Institute for Carbon Neutrality Department of Mechanicaland Energy EngineeringSouthern University of Science and TechnologyShenzhen 51855Guangdong China Institute of High Energy Physics Chinese Academy of Sciences(CAS)Beijing 100049China Chongqing Institute of Green and Inteligent Technology University of Chinese Academy of Sciences(UCAS Chongqing)Chinese Academy of SciencesChongqing 400714China Department of Chemistry Southerm University of Science and TechnologyShenzhen 518055GuangdongChina

The defects from electron transport layer,perovskite layer and their interface would result in carrier nonradiative recombination *** buried interfacial contact is detrimental to charge extraction and device ***,we report a bottom-up holistic carrier management strategy induced synergistically by multiple chemical bonds to minimize bulk and interfacial energy losses for high-performance perovskite photovoltaics.4-trifluoromethyl-benzamidine hydrochloride(TBHCl)containing–CF_(3),amidine cation and Cl^(-)is in advance incorporated into SnO_(2)colloid solution to realize bottom-up *** synergistic effect of multiple functional groups and multiple-bond-induced chemical interaction are revealed theoretically and experimentally.F and Cl^(-)can passivate oxygen vacancy and/or undercoordinated Sn^(4+)defects by coordinating with Sn^(4+).The F can suppress cation migration and modulate crystallization via hydrogen bond with FA^(+),and can passivate lead defects by coordinating with Pb^(2+).The–NH_(2)–C=NH^(+)_(2)and Cl^(-)can passivate cation and anion vacancy defects through ionic bonds with perovskites,*** TBHCl modification,the suppression of agglomeration of SnO_(2)nanoparticles,bulk and interfacial defect passivation,and release of tensile strains of perovskite films are demonstrated,which resulted in a PCE enhancement from 21.28%to 23.40%and improved *** post-treatment,the efficiency is further improved to 23.63%.

关键词： Perovskite solar cells Bottom-up holistic carrier management strategy Functional group synergistic effect Defect passivation Stress release

Near-unity quantum yield in zero-dimensional lead-free manganese-based halides for flexible X-ray imaging with high spatial resolution

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eScience 2023年第2期3卷 103-111页

作者： Wen Ma Dehai Liang Qingkai Qian Qionghua Mo Shuangyi Zhao Wensi Cai jiangzhao chen Zhigang Zang Key Laboratory of Optoelectronic Technology&Systems(Ministry of Education) Chongqing UniversityChongqing400044China

Low-dimensional luminescent lead-free metal halides have received substantial attention due to their unique optoelectronic *** them,zero-dimensional(0D)manganese(II)-based metal halides with negligible self-absorption have emerged as potential candidates in X-ray ***,we for the first time report a novel lead-free(TBA)_(2)MnBr_(4) single crystal synthesized via a facile solvent evaporation *** this crystal,[MnBr_(4)]^(2-)units are isolated by large TBA^(+)organic cations,resulting in a unique 0D *** prepared manganese-based crystals exhibit a bright-green emission centered at 512 nm with a high photoluminescence quantum yield(PLQY)of 93.76%at room temperature,originating from the ^(4)T_(1)–^(6)A_(1) transition of Mn^(2+).Apart from their outstanding optical performance,the crystals also show excellent stability and can maintain 94.4%of the initial PLQY even after being stored in air for 90 ***(TBA)_(2)MnBr4 films prepared as X-ray imaging scintillators exhibit a low detection limit of 63.3 nGyair/s,a high light yield of 68000 ph/MeV,and a high spatial resolution of 15.4 lp/***,this work not only enriches the family of lead-free metal halides but also expands the application of manganese(II)-based halides in flexible X-ray scintillators.

关键词： Manganese(II)-based metal halides Organic-inorganic hybrids Single crystals Flexible X-ray imaging

Mechanical pressing method for making high-quality perovskite single crystals

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Journal of Semiconductors 2023年第11期44卷 1-4页

作者： chenglin Wang Jie Sun jiangzhao chen Cong chen Liming Ding State Key Laboratory of Reliability and Intelligence of Electrical Equipment School of Materials Science and EngineeringHebei University of TechnologyTianjin 300401China Faculty of Materials Science and Engineering Kunming University of Science and TechnologyKunming 650093China Center for Excellence in Nanoscience(CAS) Key Laboratory of Nanosystem and Hierarchical Fabrication(CAS)National Center for Nanoscience and TechnologyBeijing 100190China Macao Institute of Materials Science and Engineering(MIMSE) Macao University of Science and TechnologyMacao 999078China

Halide perovskites show excellent photovoltaic properties[1−4].However,the preparation of high-quality perovskite crystals remains a great challenge,which limits their *** materials applied to photodetectors mainly include polycrystalline thin films and single *** solution methods are used to prepare polycrystalline thin films,and the films are full of defects such as voids and grain boundaries[5−7].Compared to polycrystalline thin films,perovskite single crystals possess high crystallinity and low defect density[8−10].Photodetectors based on perovskite single crystals exhibit excellent performance[11].However,the size limitation of single crystals hinders their application in photodetectors[12].

关键词： perovskite polycrystalline hinder