GaN-based vertical P-i-N diode with mesa edge terminal structure due to electric field crowding effect, the breakdown voltage of the device is significantly reduced. This work investigates three terminal structures, i...GaN-based vertical P-i-N diode with mesa edge terminal structure due to electric field crowding effect, the breakdown voltage of the device is significantly reduced. This work investigates three terminal structures, including deeply etched, bevel, and stepped-mesas terminal structures, to suppress electric field crowding effects at the device and junction edges. Deeply-etched mesa terminal yields a breakdown voltage of 1205 V, i.e., 89% of the ideal voltage. The bevel-mesa terminal achieves about 89% of the ideal breakdown voltage, while the step-mesa terminal is less effective in mitigating electric field crowding, at about 32% of the ideal voltage. This work can provide an important reference for the design of high-power, high-voltage GaN-based P-i-N power devices, finding a terminal protection structure suitable for GaNPiN diodes to further enhance the breakdown performance of the device and to unleash the full potential of GaN semiconductor materials.展开更多
钙钛矿太阳能电池(perovskite solar cells,PSCs)由于光电转换效率高、制备工艺简单、成本低等优势受到广泛关注,电池效率已从3.8%提升到25.7%。目前,对基于SnO_(2)电子传输层的n-i-p型平板结构电池的研究越来越多,但存在着工艺可重复...钙钛矿太阳能电池(perovskite solar cells,PSCs)由于光电转换效率高、制备工艺简单、成本低等优势受到广泛关注,电池效率已从3.8%提升到25.7%。目前,对基于SnO_(2)电子传输层的n-i-p型平板结构电池的研究越来越多,但存在着工艺可重复性差、效率低等问题。针对n-i-p型平板结构PSCs的制备进行了系统的研究,包括导电基底的选择、钙钛矿制备工艺参数的优化以及电池存储环境。结果证明,上述参数对于电池均具有重要影响,并结合扫描电子显微镜、X射线衍射、吸收光谱分析了原因。在最优工艺条件下(掺锡氧化铟基底,PbI_(2)退火温度70℃(1 min),胺盐溶液滴加后静置时间不超过5 s,存储湿度4.5%),器件平均效率达到21.85%,最高效率达到23.47%,迟滞可忽略,具有良好的可重复性。研究结果可为制备重复性好、光电转换效率高的PSCs提供科学支撑。展开更多
以2011~2021年Web of Science核心数据库和中国知网数据库中的584篇零工经济文献为样本进行计量分析,系统梳理该研究领域的发文情况、期刊分布、核心作者、发展脉络和研究热点;从搜集的相关文献中选取117篇高质量文献,运用内容分析法,...以2011~2021年Web of Science核心数据库和中国知网数据库中的584篇零工经济文献为样本进行计量分析,系统梳理该研究领域的发文情况、期刊分布、核心作者、发展脉络和研究热点;从搜集的相关文献中选取117篇高质量文献,运用内容分析法,整理剖析零工经济的主要研究内容,基于“输入—过程—输出”的逻辑主线,从宏观、平台和个体层面梳理零工经济的动因与效用,从平台企业、零工从业者和消费者三方剖析其动态交互过程;从算法管理、自我管理、组织管理和中国情境视角提出可供参考的研究方向。展开更多
文摘GaN-based vertical P-i-N diode with mesa edge terminal structure due to electric field crowding effect, the breakdown voltage of the device is significantly reduced. This work investigates three terminal structures, including deeply etched, bevel, and stepped-mesas terminal structures, to suppress electric field crowding effects at the device and junction edges. Deeply-etched mesa terminal yields a breakdown voltage of 1205 V, i.e., 89% of the ideal voltage. The bevel-mesa terminal achieves about 89% of the ideal breakdown voltage, while the step-mesa terminal is less effective in mitigating electric field crowding, at about 32% of the ideal voltage. This work can provide an important reference for the design of high-power, high-voltage GaN-based P-i-N power devices, finding a terminal protection structure suitable for GaNPiN diodes to further enhance the breakdown performance of the device and to unleash the full potential of GaN semiconductor materials.
文摘钙钛矿太阳能电池(perovskite solar cells,PSCs)由于光电转换效率高、制备工艺简单、成本低等优势受到广泛关注,电池效率已从3.8%提升到25.7%。目前,对基于SnO_(2)电子传输层的n-i-p型平板结构电池的研究越来越多,但存在着工艺可重复性差、效率低等问题。针对n-i-p型平板结构PSCs的制备进行了系统的研究,包括导电基底的选择、钙钛矿制备工艺参数的优化以及电池存储环境。结果证明,上述参数对于电池均具有重要影响,并结合扫描电子显微镜、X射线衍射、吸收光谱分析了原因。在最优工艺条件下(掺锡氧化铟基底,PbI_(2)退火温度70℃(1 min),胺盐溶液滴加后静置时间不超过5 s,存储湿度4.5%),器件平均效率达到21.85%,最高效率达到23.47%,迟滞可忽略,具有良好的可重复性。研究结果可为制备重复性好、光电转换效率高的PSCs提供科学支撑。
文摘以2011~2021年Web of Science核心数据库和中国知网数据库中的584篇零工经济文献为样本进行计量分析,系统梳理该研究领域的发文情况、期刊分布、核心作者、发展脉络和研究热点;从搜集的相关文献中选取117篇高质量文献,运用内容分析法,整理剖析零工经济的主要研究内容,基于“输入—过程—输出”的逻辑主线,从宏观、平台和个体层面梳理零工经济的动因与效用,从平台企业、零工从业者和消费者三方剖析其动态交互过程;从算法管理、自我管理、组织管理和中国情境视角提出可供参考的研究方向。
