Comparing with hot researches in absorber layer,window layer has attracted less attention in PbS quantum dot solar cells(QD SCs). Actually, the window layer plays a key role in exciton separation, charge drifting, and...Comparing with hot researches in absorber layer,window layer has attracted less attention in PbS quantum dot solar cells(QD SCs). Actually, the window layer plays a key role in exciton separation, charge drifting, and so on.Herein, ZnO window layer was systematically investigated for its roles in QD SCs performance. The physical mechanism of improved performance was also explored. It was found that the optimized ZnO films with appropriate thickness and doping concentration can balance the optical and electrical properties, and its energy band align well with the absorber layer for efficient charge extraction. Further characterizations demonstrated that the window layer optimization can help to reduce the surface defects, improve the heterojunction quality, as well as extend the depletion width. Compared with the control devices, the optimized devices have obtained an efficiency of 6.7% with an enhanced V_(oc) of 18%, J_(sc) of 21%, FF of 10%, and power conversion efficiency of 58%. The present work suggests a useful strategy to improve the device performance by optimizing the window layer besides the absorber layer.展开更多
The application of a p~＋/p configuration in the window layer of hydrogenated amorphous silicon thin film solar cells is simulated and analyzed utilizing an AMPS-ID program.The differences between p~＋-p-i-n configura...The application of a p~＋/p configuration in the window layer of hydrogenated amorphous silicon thin film solar cells is simulated and analyzed utilizing an AMPS-ID program.The differences between p~＋-p-i-n configuration solar cells and p-i-n configuration solar cells are pointed out.The effects of dopant concentration, thickness of p~＋-layer,contact barrier height and defect density on solar cells are analyzed.Our results indicate that solar cells with a p~＋-p-i-n configuration have a better performance.The open circuit voltage and short circuit current were improved by increasing the dopant concentration of the p~＋ layer and lowering the front contact barrier height.The defect density at the p/i interface which exceeds two orders of magnitude in the intrinsic layer will deteriorate the cell property.展开更多
采用Apache+PHP+MySQL技术设计开发了三层结构模式的视频直播网站——"武警黄金部队学术交流平台",利用Windows MediaEncoder进行学术交流现场的音视频采集,Windows Media Server进行视频发布,直播和点播的流媒体内容嵌入到H...采用Apache+PHP+MySQL技术设计开发了三层结构模式的视频直播网站——"武警黄金部队学术交流平台",利用Windows MediaEncoder进行学术交流现场的音视频采集,Windows Media Server进行视频发布,直播和点播的流媒体内容嵌入到HTML网页,用户用IE、FireFox等浏览器登录浏览视频直播网页即可实现网络视频直播和点播。展开更多
随着城市化进程加速,智慧城市建设对建筑物三维信息的高效获取需求日益迫切。传统小区容积率测量方法依赖人工测量与二维图纸分析,存在效率低、成本高、动态更新困难等问题,难以满足现代城市精细化管理的需求。提出一种融合无人机三维...随着城市化进程加速,智慧城市建设对建筑物三维信息的高效获取需求日益迫切。传统小区容积率测量方法依赖人工测量与二维图纸分析,存在效率低、成本高、动态更新困难等问题,难以满足现代城市精细化管理的需求。提出一种融合无人机三维建模与深度学习技术的小区容积率快速计算方法:通过无人机倾斜摄影技术获取高分辨率影像数据,构建精确的三维模型以提取建筑物立体信息;结合改进YOLO(you only look once)算法对建筑立面窗户进行分层识别与定位,利用窗户分布特征与建筑高度的相关性推导容积率。该方法通过自动化流程替代传统人工操作,显著提高了数据采集与处理效率,降低了人力与时间成本,同时保障了计算结果的准确性和实时性。研究成果为城市规划与管理提供了高效的技术工具,推动城市资源分配优化与智慧化发展,为提升居民生活品质与城市可持续发展提供支撑。展开更多
基金financially supported by the National Natural Science Foundation of China(61306137,51602114)the Research Fund for the Doctoral Program of Higher Education(20130142120075)+2 种基金the Fundamental Research Funds for the Central Universities(HUST:2016YXMS032)the Guangdong-Hong Kong joint innovation project(Grant No.2016A050503012)the Guangdong Natural Science Funds for Distinguished Young Scholars(Grant No.2015A030306044)
文摘Comparing with hot researches in absorber layer,window layer has attracted less attention in PbS quantum dot solar cells(QD SCs). Actually, the window layer plays a key role in exciton separation, charge drifting, and so on.Herein, ZnO window layer was systematically investigated for its roles in QD SCs performance. The physical mechanism of improved performance was also explored. It was found that the optimized ZnO films with appropriate thickness and doping concentration can balance the optical and electrical properties, and its energy band align well with the absorber layer for efficient charge extraction. Further characterizations demonstrated that the window layer optimization can help to reduce the surface defects, improve the heterojunction quality, as well as extend the depletion width. Compared with the control devices, the optimized devices have obtained an efficiency of 6.7% with an enhanced V_(oc) of 18%, J_(sc) of 21%, FF of 10%, and power conversion efficiency of 58%. The present work suggests a useful strategy to improve the device performance by optimizing the window layer besides the absorber layer.
基金supported by the Key Programs for Science and Technology Development of Jiangsu,China(Nos.BE20080030,BE2009028)the Qing Lan Project,China(No.2008-04)the Jiangsu"333"Project,China(No.201041)
文摘The application of a p~＋/p configuration in the window layer of hydrogenated amorphous silicon thin film solar cells is simulated and analyzed utilizing an AMPS-ID program.The differences between p~＋-p-i-n configuration solar cells and p-i-n configuration solar cells are pointed out.The effects of dopant concentration, thickness of p~＋-layer,contact barrier height and defect density on solar cells are analyzed.Our results indicate that solar cells with a p~＋-p-i-n configuration have a better performance.The open circuit voltage and short circuit current were improved by increasing the dopant concentration of the p~＋ layer and lowering the front contact barrier height.The defect density at the p/i interface which exceeds two orders of magnitude in the intrinsic layer will deteriorate the cell property.
文摘采用Apache+PHP+MySQL技术设计开发了三层结构模式的视频直播网站——"武警黄金部队学术交流平台",利用Windows MediaEncoder进行学术交流现场的音视频采集,Windows Media Server进行视频发布,直播和点播的流媒体内容嵌入到HTML网页,用户用IE、FireFox等浏览器登录浏览视频直播网页即可实现网络视频直播和点播。
文摘随着城市化进程加速,智慧城市建设对建筑物三维信息的高效获取需求日益迫切。传统小区容积率测量方法依赖人工测量与二维图纸分析,存在效率低、成本高、动态更新困难等问题,难以满足现代城市精细化管理的需求。提出一种融合无人机三维建模与深度学习技术的小区容积率快速计算方法:通过无人机倾斜摄影技术获取高分辨率影像数据,构建精确的三维模型以提取建筑物立体信息;结合改进YOLO(you only look once)算法对建筑立面窗户进行分层识别与定位,利用窗户分布特征与建筑高度的相关性推导容积率。该方法通过自动化流程替代传统人工操作,显著提高了数据采集与处理效率,降低了人力与时间成本,同时保障了计算结果的准确性和实时性。研究成果为城市规划与管理提供了高效的技术工具,推动城市资源分配优化与智慧化发展,为提升居民生活品质与城市可持续发展提供支撑。
