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photoresponse and H2 gas sensing properties of highly oriented Al and Al/Sb doped ZnO thin films

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Progress in Natural Science:Materials International 2013年第6期23卷 519-523页

作者： Hannane Benelmadjat Boubekeur Boudine Aissa Keffous Noureddine Gabouze Laboratoire de Physico-Chimie des Semi-Conducteurs Departement de PhysiqueFaculte des Sciences ExactesUniversite Mentouri-Route Ain Elbey 2. Laboratoire de CristallographieDepartement de PhysiqueFaculte des Sciences ExactesUniversite Mentouri-Route Ain Elbey 3. Silicon Technology Development Unit

ZnO:Al and ZnO:Al/Sb thin films have been prepared and *** thin films were deposited on Si substrates by the sol-gel *** structural,optical and electrical properties of ZnO films have been investigated by spectrophotometry,ellipsometry,X-ray diffraction and current-voltage *** is found that the films exhibit wurtzite structure with a highly c-axis orientation perpendicular to the surface of the substrate,a high reflectivity in the infrared region and a response to ***,it has been found that Si/(ZnO:Al/Sb)/Al photodiode is promising in photoconduction device while Si/(ZnO:Al)/Al can be used as gas sensor responding to the low Hconcentrations.

关键词： Zinc oxide Co-doping Thin films Gas sensing photoresponse

Edge assisted epitaxy of CsPbBr_(3)nanoplates on Bi_(2)O_(2)Se nanosheets for enhanced photoresponse

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Chinese Physics B 2022年第4期31卷 693-699页

作者：蒋浩天徐兴樊超代贝贝亓卓栋蒋莎蔡孟秋张清林 Key Laboratory for Micro-/Nano-Optoelectronic Devices of Ministry of Education School of Physics and ElectronicsHunan UniversityChangsha 410082China

Bi_(2)O_(2)Se has been proved to be a promising candidate for electronic and optoelectronic devices due to their unique physical ***,it is still a great challenge to construct the heterostructures with direct epitaxy of hetero semiconductor materials on Bi_(2)O_(2)Se ***,a two-step chemical vapor deposition(CVD)route was used to directly grow the CsPbBr_(3)nanoplate-Bi_(2)O_(2)Se nanosheet hetero *** CsPbBr_(3)nanoplates were selectively grown on the Bi_(2)O_(2)Se nanosheet along the edges,where the dangling bonds provide the nucleation *** epitaxial relationships between CsPbBr3 and Bi_(2)O_(2)Se were determined as[200]_(Bi_(2)O_(2)Se)‖[110]_(CsPbBr_(3))and[110]_(Bi_(2)O_(2)Se)‖[200]_(CsPbBr_(3))by transmission electron microscopy *** photoluminescence(PL)results reveal that the formation of heterostructures results in the remarkable PL quenching due to the type-Ⅰband arrangement at CsPbBr_(3)/Bi_(2)O_(2)Se interface,which was confirmed by ultraviolet photoelectron spectroscopy(UPS)and Kelvin probe measurements,and makes the photogenerated carriers transfer from CsPbBr_(3)to Bi_(2)O_(2)***,the photodetectors based on the heterostructures exhibit a 4-time increase in the responsivity compared to those based on the pristine Bi_(2)O_(2)Se sheets,and the fast rise and decay time in *** results indicate that the direct epitaxy of the CsPbBr_(3)plates on the Bi_(2)O_(2)Se sheet may improve the optoelectronic performance of Bi_(2)O_(2)Se based devices.

关键词： Bi_(2)O_(2)Se heterostructures photogenerated carriers photoresponse

Enhanced ultraviolet photoresponse based on ZnO nanocrystals/Pt bilayer nanostructure

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Chinese Physics B 2015年第6期24卷 534-539页

作者：佟晓林夏晓智李青侠 Department of Electronics and Information Engineering Huazhong University of Science and Technology School of Physics and Electronics Henan University

The development of solution strategies for Zinc oxide （ZnO） quantum dots provides a pathway to utilizing ZnO nanocrystal thin films in optoelectronic devices. In this work, quasi-spherical ZnO quantum dots with a diameter of 5 nm are synthesized by using ethanol as a solvent. ZnO nanocrystal thin film is obtained by spin-coating ZnO quantum dots on a Au interdigital electrode （IDE）/AI203 substrate and annealing at different temperatures in order to yield the optimal pho- tosensitive on/off ratio of ZnO. For further enhancing the responsivity, ion sputtering is utilized to deposit Pt nanoparticles on the surface of ZnO nanocrystal thin film, the responsivity of the ZnO/Pt bilayer nanostructure increases from 0.07 A/W to 54 A/W, showing that the metal/inorganic nanocrystal bilayer nanostructure can be used to improve the performance of optoelectronic devices. The excellent properties of ZnO/Pt bilayer nanostructure have important applications in future electronic and optoelectronic devices.

关键词： zinc oxide nanocrystals photoresponse ion sputtering plasma treatment

Tune the photoresponse of monolayer MoS_(2) by decorating CsPbBr_(3) perovskite nanoparticles

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Chinese Chemical Letters 2023年第7期34卷 345-349页

作者： Chao Tan Rui Tao Zhihao Yang Lei Yang Xiaolei Huang Yong Yang Fei Qi Zegao Wang College of Materials Science and Engineering Sichuan UniversityChengdu 610065China State Key Laboratory of Solidification Processing Center of Advanced Lubrication and Seal MaterialsNorthwestern Polytechnical UniversityXi'an 710072 China College of Optoelectronic Engineering Chongqing University of Posts and TelecommunicationsChongqing 400065China

Tuning the photoresponse of monolayer MoS_(2) could extend its potential application in many fields,however,it is still a *** this study,CsPbBr_(3) nanoparticles were prepared and spin-coated on the surface of monolayer MoS_(2) to fabricate hybrid CsPbBr_(3)/MoS_(2) *** combing the photoelectrical property of the CsPbBr_(3),the synergistic effect has been systematically studied from its carrier mobility,photoresponse and *** was found that nanofilm-coating of CsPbBr_(3)would impede the photoelectric performance due to the electron-hole recombination facilitated by the defects at the interface of C PbBr_(3) and MoS_(2) *** the nanoparticles decorating was observed to significantly improve the conductivity of the monolayer Mo S_(2),which also increased the on/off ratio of the MoS_(2) transistor from 8.2×10~3 to 4.4×10^(4),and enhanced the carrier mobility from 0.090 cm^(2)V^(-1)s^(-1)to 0.202 cm^(2)V^(-1)s^(-1),ascribing to a mixed electron recombination-injection ***,the CsPbBr_(3) nanofilm would decrease the responsivity to 136 and 178 A/W under the light wavelength of 400 and 500 nm,respectively,while decorating CsPbBr_(3) nanoparticles improve the photoresponse to 948 and 883 A/W with the detectivity at the level of 10^(11)*** work may provide an easy and cost-efficient way to tune the photoresponse of MoS_(2) photodetectors.

关键词： MoS_(2)photodetector CsPbBr_(3)NPs Surface charge doping Carrier mobility photoresponse

Trap induced slow photoresponse of single CdS nanoribbons

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Chinese Physics B 2008年第8期17卷 3103-3107页

作者：王菲菲王翀程轲邹炳锁 School of Physics and Electronic Engineering Ludong University Institute of Physics Chinese Academy of Sciences Institute of Opto-Electronic Information Technology Yantai University Micro-Nano Technologies Research Center and National Key Laboratory of CBSC Hunan University

Wurtzite CdS nanoribbons are prepared by using a simple thermal evaporation method. Electron microscopy shows that the ribbons are smooth in surface and uniform in size. Besides the intrinsic emission, the photoluminescence spectrum of a CdS nanoribbon shows a peak at about 580 nm, which may arise from the defect- and the trap- related transitions. The photoresponse of single CdS nanoribbons is researched. When these nanoribbons are exposed to a laser with a wavelength of 400 nm, their conductivity is enhanced greatly. The conductivity of CdS nanoribbons cannot be restored to a value without any illumination even at 5 minutes after the illumination. A model is proposed to explain this phenomenon, which may be due to a slow photoresponse induced by the trap.

关键词： CdS photoresponse

Plasmon-enhanced photoresponse of deep-subwavelength GaAs NW photodetector

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Optoelectronics Letters 2021年第7期17卷 385-389页

作者：李邦唐燕妮颜鑫张霞刘永革 School of Computer&Information Engineering Anyang Normal UniversityAnyang 455000China Key Laboratory of Oracle Bone Inscriptions Information Processing Ministry of Education of ChinaAnyang 455000China Henan Key Laboratory of Oracle Bone Inscriptions Information Processing Anyang 455000China State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and TelecommunicationsBeijing 100876China

According to optical diffraction limit, the photoresponsity of nanowire(NW)-based photodetector exponentially decreases when its NW diameter reduces to the range of deep subwavelength. In this paper, we demonstrate a photoresponse-enhanced method of the deep-subwavelength Ga As NW photodetector by using a plasmon-driven dipole antenna. Considering that the enhancement is extremely influenced by the shape and size of antenna, the structure of antenna is optimized by finite difference time domain(FDTD) solutions. The optimal structure of antenna optimizes the responsivity-enhanced factors to 1123.3 and 224.7 in NW photodetectors with NW diameters of 20 nm and 60 nm, respectively. This photoresponse-enhanced method is promising for easy-integration high-performance nanoscale photodetectors.

关键词： antenna photoresponse photodetector

STUDY ON photoresponse MECHANISM OF HIGH T_c YBa_2 Cu_3O_(7-x) SUPERCONDUCTING FILMS AT TEMPERATURES IN THE TRANSITION REGION

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Chinese Science Bulletin 1992年第24期37卷 2090-2093页

作者：郝建华周方桥赵兴荣孙汉东王玲杰易新建 Department of Optical Engineering Huazhong University of Science and Technology Wuhan 430074 PRC

Since the discovery of high temperature oxide superconductors in 1986, it is possible to adapt superconducting materials for technological applications at liquid nitrogen. One of the important applications is the fabrication of superconducting optical detector. This kind of device has good performances of wide response spectrum (from the visible to the millimeter),

关键词： YBa2 Cn307-x superconducting films photoresponse mechanism analysis

photoresponse Process and Model Comparison of Paeonia ludlowii under Saline-alkali Stress

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Meteorological and Environmental Research 2019年第4期10卷 84-87,92页

作者： Ge Qingsong Gao Yi Wang Hang Fang Jiangping Res. Institute of Tibet Plateau Ecology Tibet Agriculture & Animal Husbandry University Nyingchi 860000 China Tibet Key Laboratory of Forest Ecology in Plateau Area Ministry of Education Nyingchi 860000 China National Key Station of Field Scientific Observation & Experiment Nyingchi 860000 China Key Laboratory of Forest Ecology in Plateau Area Tibet Autonomous Region Nyingchi 860000 China United Key Laboratories of Ecological Security Tibet Autonomous Region Nyingchi 860000 China Resources & Environment College Tibet Agriculture & Animal Husbandry University Nyingchi 860000 China Food Science College Tibet Agriculture & Animal Husbandry University Nyingchi 860000 China

The research aimed to analyze changes in photosynthetic characteristics of Paeonia ludlowii under saline-alkali stress, and annual seedlings of P. ludlowii were taken as the materials. photoresponse process of P. ludlowii leaves under saline-alkali stress was simulated, and different models were used to fit photoresponse curve. The results showed that P n of P. ludlowii leaves showed the trend of first rising and then declining with PAR increased under saline-alkali stress;both G s and T r showed a rising trend with PAR increased;C i showed the trend of first declining and then rising with PAR increased. photoresponse curve fitted by modified rectangular hyperbolic model had the best effect, and it was the optimal fitting model. P. ludlowii could adapt to saline-alkali stress in lower concentration, showing that P. ludlowii could be introduced and cultivated in saline-alkali land at a lower level.

关键词： P. ludlowii Saline-alkali stress Photosynthetic parameters photoresponse model

Fabrication of azobenzene-functionalized porous polymers for selective CO_(2) capture

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Chinese Journal of Chemical Engineering 2022年第3期35卷 24-30页

作者： Ding-Ming Xue Wen-Juan Zhang Xiao-Qin Liu Shi-Chao Qi Lin-Bing Sun State Key Laboratory of Materials-Oriented Chemical Engineering Jiangsu National Synergetic Innovation Center for Advanced Materials(SICAM)College of Chemical EngineeringNanjing Tech UniversityNanjing 211816China

Many solid adsorbents have been prepared for the CO_(2)*** particular,the photoresponsive adsorbents have attracted extensive interests because of their tunable pore structure and variable responsive behaviors provoked by the external ***,it is challenging to fabricate the photoresponsive adsorbents featured the big CO_(2)capacity and high CO_(2)***,copolymerized between 4-phenylazobenzoyl chloride,2,4,6-trichloro-1,3,5-triazine and melamine,a series of azobenzenefunctionalized porous polymers(PTM-AZOs)are successfully *** PTM-AZOs are verified in possession of proper pore structures,large surface area and photoconductive properties through a series of *** PTM-AZO-2 with the trans-isomerization exhibits the best CO_(2)adsorption amount of 2.7 mmol·g^(-1)(273 K and 0.1 MPa),while the CO_(2)/N_(2)selectivity can reach 2459 and 607 on the trans-and cis-isomerization,*** regulatable pore structures controlled by the photoresponsive azobenzene groups affect the CO_(2)capture performance of the PTM-AZOs.

关键词： Adsorption CO_(2)capture Selectivity Azobenzene photoresponse