检索结果-南通市图书馆

Opto-Electronic Advances 2022年第1期5卷 35-48页

作者： Dongdong Yan Shuangyi Zhao Yubo Zhang Huaxin Wang zhigang zang Key Laboratory of Optoelectronic Technology&Systems(Ministry of Education) Chongqing UniversityChongqing 400044China Department of Physics Southern University of Science and TechnologyShenzhen 518055China

All-inorganic CsPbBr_(3) perovskite quantum dots(QDs)have received great attention in white light emission because of their outstanding ***,their practical application is hindered by poor ***,we propose a simple strategy to synthesize excellent stability and efficient emission of CsPbBr_(3) QDs by using 2-hexyldecanoic acid(DA)as a ligand to replace the regular oleic acid(OA)*** to the strong binding energy between DA ligand and QDs,the modified QDs not only show a high photoluminescence quantum yield(PLQY)of 96%but also exhibit high stability against ethanol and *** warm white light-emitting diodes(WLEDs)are constructed by combining lig-and modified CsPbBr_(3) QDs with red AgInZnS QDs on blue emitting InGaN chips,exhibiting a color rendering index of 93,a power efficiency of 64.8 lm/W,a CIE coordinate of(0.44,0.42)and correlated color temperature value of 3018 *** ad-dition,WLEDs based on ligand modified CsPbBr_(3) QDs also exhibit better thermal performance than that of WLEDs based on the regular CsPbBr_(3) *** combination of improved efficiency and better thermal stability with high color quality indicates that the modified CsPbBr_(3) QDs are ideal for WLEDs application.

关键词： CsPbBr_(3)quantum dots ligand modification stability efficiency white light-emitting diodes

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

在线全文

学校读者我要写书评

暂无评论

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

在线全文

学校读者我要写书评

暂无评论

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)

Tunable luminescent CsPb_2Br_5 nanoplatelets:applications in light-emitting diodes and photodetectors

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Photonics Research 2017年第5期5卷 473-480页

作者： CENG HAN CUNLONG LI zhigang zang MING WANG KUAN SUN XIAOSHENG TANG JIHE DU Key Laboratory of Optoelectronic Technology(Ministry of Education) Chongqing University Key Laboratory of Low-Grade Energy Utilization Technologies and Systems (Ministry of Education) Chongqing University

Unlike organic–inorganic hybrid perovskites, all-inorganic cesium lead halide perovskites hold great promise for developing high-performance optoelectronic devices, owing to their improved stability. Herein, we investigate the perovskite-related CsPb_2 Br_5 nanoplatelets(NPLs) with tunable emission wavelengths via changing the reaction temperatures to 100°C, 120°C, and 140°C. Reaction temperature plays a key role in determining the shapes and thicknesses of the resulting CsPb_2 Br_5 NPLs. A higher temperature is in favor of the formation of smaller and thicker NPLs. To develop their potential applications in optoelectronic devices, green light emitting diodes(LEDs) and photodetectors based on CsPb_2 Br_5 NPLs are fabricated. The green LEDs based on CsPb_2 Br_5 NPLs synthesized at 140°C exhibit an excellent pure green emission(full width at half-maximum of <20 nm) and display a luminous efficiency of 34.49 lm∕W under an operation current of 10 m A. Moreover, the photodetector based on CsPb_2 Br_5 NPLs synthesized at 100°C has better performance with a rise time of 0.426 s, a decay time of0.422 s, and a ratio of the current(with and without irradiation) of 364%.

关键词： Cs Pb Br Tunable luminescent CsPb2Br5 nanoplatelets:applications in light-emitting diodes and photodetectors

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

在线全文

学校读者我要写书评

暂无评论

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

Stable yellow light emission from lead-free copper halides single crystals for visible light communication

在线全文

学校读者我要写书评

暂无评论

Nano Materials Science 2023年第1期5卷 78-85页

作者： Baiqian Wang Yuru Tang Xin Yang Wensi Cai Ru Li Wen Ma Shuangyi Zhao Chen Chen zhigang zang Key Laboratory of Optoelectronic Technology&Systems(Ministry of Education) Chongqing UniversityChongqing400044China School of Microelectronics and Communication Engineering Chongqing UniversityChongqing400044China

Yellow light-emitting diodes(LEDs) as soft light have attracted abundant attention in lithography room, museum and art gallery. However, the development of efficient yellow LEDs lags behind green and blue LEDs, and the available perovskites yellow LEDs suffer from the instability. Herein, a pressure-assisted cooling method is proposed to grow lead-free CsCu2I3single crystals, which possess uniform surface morphology and enhanced photoluminescence quantum yield(PLQY) stability, with only 10% PLQY losses after being stored in air after 5000 ***, the single crystals used for yellow LEDs without encapsulation exhibit a decent Correlated Color Temperature(CCT) of 4290 K, a Commission Internationale de l’Eclairage(CIE) coordinate of(0.38, 0.41), and an excellent 570-h operating stability under heating temperature of 100°C. Finally, the yellow LEDs facilitate the application in wireless visible light communication(VLC), which show a-3 dB bandwidth of 21.5 MHz and a high achievable data rate of 219.2 Mbps by using orthogonal frequency division multiplexing(OFDM) modulation with adaptive bit loading. The present work not only promotes the development of lead-free single crystals, but also inspires the potential of CsCu2I3in the field of yellow illumination and wireless VLC.

关键词： Lead-free copper halides Single crystals Yellow light-emitting diodes Visible light communication(VLC)

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

在线全文

学校读者我要写书评

暂无评论

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

Ultrapure and highly efficient green light emitting devices based on ligand-modified CsPbBr3 quantum dots

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Photonics Research 2020年第7期8卷 1086-1092页

作者： Dongdong Yan Shuangyi Zhao Huaxin Wang zhigang zang Key Laboratory of Optoelectronic Technology&Systems(Ministry of Education) Chongqing UniversityChongqing 400044China

All inorganic Cs PbBr3 perovskite quantum dots(QDs)have been recognized as promising optical materials tfabricate green light emission devices because of their excellent optical ***,regular Cs Pb BrQDs with an oleic acid(OA)ligand show poor stability,which limits their practical *** replaced thOA ligand in Cs PbBr3 QDs with a 2-hexyldecanoic acid(DA)ligand and,in the synthesis,found that the nematerial has better optical properties than regular Cs PbBr3 QDs(Cs PbBr3-OA QDs).Due to the strong bindinenergy between the DA ligand and QDs,the ligand-modified Cs PbBr3 QDs(Cs PbBr3-DA QDs)show a higphotoluminescence quantum yield(PLQY)of 96%,while the PLQY of Cs PbBr3-OA QDs is 84%.Subsequentlythe Cs PbBr3 QDs coated on the blue light-emitting diode(LED)chips as green phosphors are *** conversion from blue to pure green is achieved by adding the Cs PbBr3-OA QDs solution up to 60μL,whilthe pure green emission devices only need 18μL Cs PbBr3-DA QDs solution under the same ***,highly efficient green light-emitting devices based on Cs PbBr3-DA QDs exhibit a luminous efficiencof 43.6 lm/W with a CIE(0.2086,0.7635)under a 15.3 m A driving *** addition,the green emissiowavelength of the devices based on Cs PbBr3-DA QDs almost has no shift,even under a high injection currenThese results highlight the promise of DA ligand-modified Cs PbBr3 QDs for light-emitting devices and enrich thapplication field of ligand-modified Cs PbBr3 QDs.

关键词： quantum light modified

High-performance CsPbBr_(3)@Cs_(4)PbBr_(6)/SiO_(2) nanocrystals via double coating layers for white light emission and visible light communication

在线全文

学校读者我要写书评

暂无评论

eScience 2022年第6期2卷 646-654页

作者： Xianwen Li Wen Ma Dehai Liang Wensi Cai Shuangyi Zhao zhigang zang Key Laboratory of Optoelectronic Technology&Systems(Ministry of Education) Chongqing UniversityChongqing 400044China

Owing to their outstanding optoelectronic properties,all-inorganic CsPbBr_(3) perovskite nanocrystals(NCs)are regarded as excellent materials for various optoelectronic ***,their practical applications are limited by poor stability against water,heat,and polar ***,we propose a facile synthesis strategy for CsPbBr_(3)@Cs_(4)PbBr_(6) NCs via tetraoctylammonium bromide ligand induction at room *** resulting CsPbBr_(3)@Cs_(4)PbBr_(6) NCs show a high photoluminescence quantum yield of 94%.In order to prevent Cs4PbBr6 from being converted back to CsPbBr_(3) NCs when exposed to water,a second coating layer of SiO2 is formed on the surface of the CsPbBr_(3)@Cs_(4)PbBr_(6) NCs by the facile hydrolysis of *** resulting CsPbBr_(3)@Cs_(4)PbBr_(6)/SiO_(2) NCs with their double coating structure have outstanding stability against not only a polar solvent(ethanol)but also water and *** as-prepared CsPbBr_(3)@Cs_(4)PbBr_(6)/SiO_(2) NCs serve as green emitters in efficient white light-emitting diodes(WLEDs)with a high color rendering index(CRI)of 91 and a high power efficiency 59.87 lm W−***,the use of these WLEDs in visible light communication(VLC)results in a maximum rate of 44.53 Mbps,suggesting the great potential of the reported methods and materials for solid-state illumination and VLC.

关键词： CsPbBr_(3)@Cs_(4)PbBr_(6)/SiO_(2)NCs Stability White light emission Visible light communication

Performance enhancement of solution-processed InZnO thin-film transistors by Al doping and surface passivation

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Semiconductors 2022年第3期43卷 94-103页

作者： Wensi Cai Haiyun Li Mengchao Li zhigang zang Key Laboratory of Optoelectronic Technology&System(Ministry of Education) Chongqing UniversityChongqing 400044China

Solution-processed oxide semiconductors have been considered as a potential alternative to vacuum-based ones in printable ***,despite spincoated InZnO(IZO)thin-film transistors(TFTs)have shown a relatively high mobil-ity,the lack of carrier suppressor and the high sensitivity to oxygen and water molecules in ambient air make them potentially suffer issues of poor *** this work,Al is used as the third cation doping element to study the effects on the electrical,optoelectronic,and physical properties of IZO TFTs.A hydrophobic self-assembled monolayer called octadecyltrimethoxysilane is introduced as the surface passivation layer,aiming to reduce the effects from air and understand the importance of top surface conditions in solution-processed,ultra-thin oxide *** to the reduced trap states within the film and at the top surface enabled by the doping and passivation,the optimized TFTs show an increased current on/off ratio,a reduced drain current hysteresis,and a significantly enhanced bias stress stability,compared with the untreated *** combining with high-capacitance AlO_(x),TFTs with a low operating voltage of 1.5 V,a current on/off ratio of>10^(4) and a mobility of 4.6 cm^(2)/(V·s)are demonstrated,suggesting the promising features for future low-cost,low-power electronics.

关键词： thin-film transistors oxide semiconductors Al doping surface passivation