Currently,SnO2(Tin Dioxide)has become the most commonly used material for the electron transport layer in high-performance PSCs(Perovskite Solar Cells).A strategy for optimizing SnO2 using a small-molecule chelator is proposed to address the problem of agglomeration-prone commercial SnO2 aqueous dispersions and the need to enhance the electrical and surface properties of SnO2 films.The PSCs with the device structure of ITO/SnO2+SC/FA1-xMAxPbI3/Spiro-OMeTAD/Au are prepared by doping the SnO2 transport layer with a low-cost chelator,SC(Sodium Citrate).After the introduction of SC with an optimized concentration,the open-circuit voltage and fill factor of PSCs can reach up to 1.135 V and 78.23％,respectively,with a power conversion efficiency of 21.53％.This represents a significant improvement compared to the devices without the introduction of SC.The characterization of the films and devices revealed that the doping of SC could enhance the electrical and surface properties of the SnO2 films,which in turn improves perovskite crystallization.As a result,defects in the device are reduced,recombination loss is lowered,and charge transport is promoted.

To monitor changes of indoor carbon dioxide concentrations in real time,a carbon dioxide alarm based on a gas sensor with a STC89C52 microcontroller as the core is designed.When the CO2 concentration in the air exceeds the preset value,the sound and light alarm function can be activated,and the indoor CO2 concentration value can be displayed in real-time.The hardware system includes a carbon dioxide sensor,signal conditioning circuit,analog-to-digital conversion circuit,STC89C52 microcontroller,and acousto-optic alarm unit.The software system includes data acquisition,data processing,alarm logic,and other functional units.The alarm can be activated in time when indoor CO2 concentration exceeds 1.5％.

Metal oxide semiconductor-based gas sensors can realize the highly sensitive detection to target gases at high temperature by constructing different nano/ micro structures. However, the excellent sensing performance is always associated with the very high original resistance, which brings about issues in the practical application. Herein, different cations (Al3+ , Sn4+ and Sb5+ ) doped ZnO nanoparticles were synthesized and used as the acetone sensing materials. Results show that the resistance of sensors based on Sn4+ doped ZnO was significantly reduced (from 5.18 MΩ to 0.28 MΩ) at 270 ºC without sacrificing acetone sensing responses. In addition, the gas sensor also exhibited the fast response/recovery time (1/10 s) and great long-term stability. The electron compensation and improved adsorbing oxygen ability for the Sn4+ doped ZnO nanoparticles contributed to the relative low resistance and the enhanced sensing performances.

为提高高校实验教学效果与学生实验成绩,提出基于虚拟仿真技术的高校实验在线教学系统.分析高校在线虚拟实验教学类型,结合分析结果与虚拟仿真技术,设计包括信息输入单元、实验教学虚拟交互单元以及信息输出单元的高校实验在线教学系统.用户通过信息输入单元输入指令,转换为虚拟计算机语言后,由实验教学虚拟交互单元接收指令,并调用相关虚拟实验场景与教学内容,将实验指导与仿真演示等操控指令提供给用户完成实验操作,获得的仿真实验数据经由该单元的数据清洗模块处理后,通过信息输出单元呈现给用户,完成高校实验在线虚拟仿真教学.结果表明,该系统可实现学生的实验结果提交、成绩查询、实验预约及教师的增减、查看与调整学生信息等功能,可明显提高学生的整体实验成绩,在高并发情况下具有良好的并发响应性能,满足高校实验在校教学的实际应用需求.

以提供个性化实验教学资源、提升学生自主学习能力为目标,设计基于大数据分析的高校实验教学平台.利用虚拟计算机节点采集高校实验教学资源,利用Kubestorage云数据存储模块的目录、存储、缓存服务器完成实验教学数据的存储、计算以及节点任务划分和控制,利用时间和共同评分的混合协同过滤推荐算法为用户推荐需要的实验教学资源,通过用户层前端页面接口为用户呈现结果.实验结果表明:该平台可实现数据并发访问,满足多用户登录需求;可根据用户的兴趣点推荐相似度高的实验教学资源,并能够可视化呈现平台数据.

Despite potential advantages of metal oxide semiconductors (MOSs)-based gas sensors, the limitation of very high baseline resistance is still unsatisfactory for practical application. By means of element doping, the performance of metal oxide materials used as gas sensors can be optimized. Herein, different cations (Al3+, Sn4+, and Sb5+) doped ZnO nanoparticles were synthesized and used as the acetone sensing materials. Results show that the resistance of sensors based on Sn4+ doped ZnO was significantly reduced (from 5.18 to 0.28 MΩ) at 270 °C without sacrificing the acetone sensing responses. In addition, the gas sensor also exhibited the fast response/recovery time (1/10 s) and great long-term stability. The electron compensation and improved adsorbing oxygen ability for the Sn4+ doped ZnO nanoparticles contributed to the relatively low resistance and enhanced acetone sensing performances.

以加深学生对半导体器件性能知识的理解和掌握为目的 ,设计并开发了适用于本科实验教学的"MOS(Matal-Oxide-Semiconductor)静态参数性能研究"综合实验项目及性能测试仪.该测试仪可以分项也可组合测量多项参数,不仅有利于加深学生对器件性能知识的理解,而且有利于学生实践动手能力的培养.多年实践教学表明,该综合实验项目有助于提高学生对本专业基础课《半导体器件物理》的学习兴趣和思考.学生在实践教学中由被动学习转变为主动实验设计者与参与者,并实现了师生互动和学生之间的交流合作,取得了良好的教学效果.

为解决实验内容方法陈旧,制备气敏元件的性能指标无法满足实际测试要求的问题,对半导体气敏材料的制备及其气敏特性测量进行了实验研究,从而提高元件的性能,并使实验内容满足本科教学更加贴近科学研究前沿的需求.通过采用溶剂热法制备了三元金属氧化物Zn2 SnO4气敏材料并对其性能进行了系统测量,并将该实验内容应用于电子功能材料实验的开放性创新实验中.结果表明,基于Zn2 SnO4材料的气敏元件对HCHO气体表现出优异的气敏特性.通过该实践过程,使学生掌握一种合成纳米材料的新方法,了解材料表征方法,该项目的实施有利于学生提高科研素质和创新能力的培养.

为了解决半导体掺杂浓度的测试问题,需要采用简单易行的方法对半导体进行测试.在微电子技术领域,四探针技术一直是测量电阻率的常用方法.结合吉林大学在半导体器件物理与实验精品课程的建设,以训练学生对半导体物理学专业知识的理解和掌握,笔者对四探针法测试半导体掺杂浓度进行了实验研究.通过建立半无限大和无限薄层两个理论模型,对不同厚度半导体材料的电阻率测试方法进行了实验研究,并对原理进行了讨论.为了解决商用测试设备昂贵且无法满足实验教学需求的问题,笔者提出自制实验测试装置,采用钨合金的简易手动探针台,并根据实验需要自行设计了四探针测试架.实践应用表明:四探针测试系统的建立可以完成测量半导体掺杂浓度的任务,满足了半导体物理实验的教学需求,取得了较好的教学效果.

搭建一套毕业论文智能化管理系统,提高毕业论文管理效率.提高电子学院智能化办公能力,力争达到毕业论文无纸化办公.以自主管理为主,管理员操作为辅助,提高毕业论文管理效率,使电子学院毕业论文管理能力走在学校各学院的前列.

Lack of access to safe water is a challenge in many developing countries, especially in rural areas. It is urgent to develop cost-effective water purification technologies to guarantee drinking water safety in these areas. The present study investigated the reduction of Escherichia coli (E. coli) using ceramic disk filters (CDFs) decorated by nano-TiO2. The production of CDFs coated with nano-TiO2 in terms of rice-husk ratio, rice-husk particle size, heating hold time and nano-TiO2 mass fraction was optimized. The results show that the optimum conditions for CDFs with nano-TiO2 coating included rice-husk ratio of 29.03%, rice-husk particle size of 0.28mm, heating hold time of 1.41h and nano-TiO2 mass fraction of 2.21%. Additionally, the morphological and crystal phase characteristics of CDFs were revealed after the decoration by nano-TiO2. The effects of temperature, influent E. coli concentration, lamp power and their interactions were explored via factorial analysis. Influent E. coli concentration and lamp power had significant effects on E. coli removal efficiency. This study provided the solid theoretical support for understanding the production and bacteria inactivation relevant to CDFs impregnated with nano-TiO2. The results have important implications for finding a safe and cost-effective approach to solve drinking water problems in developing countries.

根据现代社会对电子信息类专业人才的需求分析,针对电子信息类专业的特点及培养方案的现状,提出了在电子信息类专业构建化学实验课程体系的思路并进行了初步的探索.以吉林大学电子科学与工程学院"半导体化学试验班"为试点,详细阐述了化学实验课程体系的布局及具体的设置方案,以期该实验课程体系能够广泛的应用于相关电子类专业,满足社会对电子信息类高素质复合型创新人才的需求.

Global water safety is facing great challenges due to increased population and demand. There is an urgent need to develop suitable water treatment strategy for small rural and remote communities in low-income developing countries. In order to find a low-cost solution, the reduction of E. coli using ceramic water disk coated with nano ZnO was investigated in this study. The performance of modified ceramic disk filters was influenced by several factors in the filter production process. Based on the factorial analysis, the pore size of the disk filters was the most significant factor for influencing E. coli removal efficiency and the clay content was the most significant one for influencing flow rate of modified disk filters. The coating of nano ZnO led to the change of disk filter surface and porosity. The reduction of E. coli could be attributed to both filter retention and photocatalytic antibacterial activity of nano ZnO. The effects of filter operation factors including initial E. coli concentration, illumination time and lamp power on E. coli removal effectiveness were also revealed. The results can help find a safe and cost-effective approach to solve drinking water problems in small rural and remote communities of developing regions.

本文先介绍了半导体平面工艺的发展史，及其在重要的现实意义，然后简单叙述了本实验教学中心开设的《半导体器件平面工艺实验》的课程内容设置，对实验课课堂教学中的理论和实际教学方法进行了探讨，提出课前集中讲解和实验后答疑分析讲解相结合的实验教学方法，并引导学生以科技论文形式完成专业实验课实验报告的创新教学思路。

在《光电子光电器件实验》课程中，引入菲涅尔理论的应用。把计算机软件的应用与具体实验内容相结合，探索了在实验课程中将基础理论、实践内容、计算机应用三者相结合的教学方法。通过设计与分析高阶菲涅尔透镜的性质，使学生对光电子学的色散等概念有了更全面和深入的理解，培养学生分析问题和处理问题的能力。

基于最小二乘法原理，针对激光特性开发了一套适用于探测CCD获取图像和探测屏幕显示图像的准确测量激光光束发散角的软件。适合在多种场合下进行测量，不要求设备，不挑剔CCD型号，有利于学生深入理解高斯光束的意义。

Ba0.8Sr0.2TiO3/Poly (vinylpyrrolidone) (BST/PVP) composite fibers were successfully synthesized via electrospinning. The ceramic nanofibers were obtained after calcining the composite at 800°C for 2h. The morphology and structure of the BST fibers were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The results reveal that the as-synthesized BST nanofibers show a diameter of 50–150nm with the length over 0.1mm, and a well-defined perovskite crystal structure. The electrical properties of the as-synthesized BST nanofibers were investigated through an impedance-type humidity sensor. The nanofibers exhibited excellent humidity sensing properties at room temperature. The possible sensing mechanism was proposed.

LiCl-modified mesoporous silica SBA-16 has been successfully developed as a humidity-sensitive material. Its structure and morphology was characterized by XRD, IR spectroscopy, SEM and TEM. The thick film humidity sensor was based on Al2O3 ceramic substrate with five pairs of Ag-Pd interdigital electrodes. The humidity sensitivity properties were measured using the ZL-5 model LCR analyzer at room temperature. The controlled-humidity environment was achieved by releasing super-saturation aqueous solutions of different salts of LiCl, MgCl2, Mg(NO3)(2), NaCl, KCl and KNO3 in a closed glass vessel. The sensor showed excellent humidity sensitivity from 11% to 95%RH. The variation of the impedance was more than four orders of magnitudes. Besides, the sensor showed a very good repeatability in response and recovery with the response time and recovery time of approximately 10 and 25 s, respectively. The humidity sensing mechanism was studied. We found that the mesoporous structures contributed to the humidity sensitivity and an ionic transport mechanism was discussed based on the LiCl-modified mesoporous silica SBA-16 material.

BaTiO3 nanofiber has been synthesized by electrospinning and calcination technique. An impedance-type humidity sensor has been fabricated based on this BaTiO3 nanofiber. It was pleasantly surprised to find that the impedance-type humidity sensor based on BaTiO3 nanofiber exhibited a fast responserecovery property. The response and recovery time was 4 s and 3 s from 11% to 95% relative humidity, respectively. The complex impedance of the sensor varying more than 4 orders of magnitude in the wide humidity range show excellent sensitivity. These excellent sensing characteristic prove that BaTiO3 nanofiber can be well applied for humidity sensor. Finally, an ionic conduction model has been proposed to explain the sensing mechanism.

Barium titanate (BaTiO3) nanofibers were synthesized by electrospinning and calcination techniques. Two direct current (DC) humidity sensors with different electrodes (Al and Ag) were fabricated by loading BaTiO3 nanofibers as the sensing material. Compared with the Al electrode sensor, the Ag electrode sensor exhibits larger sensitivity and quicker response/recovery. The current of Al electrode sensor increases from 4.08×10−9 to 1.68×10−7A when the sensor is switched from 11% to 95% relative humidity (RH), while the values are 2.19×10−9 and 3.29×10−7A for the Ag electrode sensor, respectively. The corresponding response and recovery times are 30 and 9s for Al electrode sensor, and 20 and 3s for Ag electrode sensor, respectively. These results make BaTiO3 nanofiber-based DC humidity sensors good candidates for practical application. Simultaneously, the comparison of sensors with different electrode materials may offer an effective route for designing and optimizing humidity sensors.