共查询到16条相似文献,搜索用时 140 毫秒
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在1024×1024可见光电荷耦合器件(CCD)的基础上增加了MPP(Multi-PinnedPhase)结构设计和工艺制作.制得的1024×1024可见光MPP CCD实现了MPP功能,有效抑制了CCD表面暗电流的产生.当MPP注入剂量为(6±2)×10~(11)cm~(-2)时,其暗电流密度下降了2/3,满阱电荷下降了1/2.Abstract: Multi-Pinned Phase (MPP) structure is designed and fabricated on the base of 1024×1024 visible light CCD. The 1024×1024 visible light MPP CCD achieves MPP function and suppresses the surface dark current effectively. Its dark current density and full well capacity decrease 2/3 and 1/2, respectively, when MPP implant dose is(6±2)×10~(11) cm~(-2). 相似文献
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MPP CCD暗电流温度特性研究 总被引:1,自引:0,他引:1
研究了MPP电荷耦合器件(CCD)暗电流和暗电流非均匀性的温度特性,并与非MPP CCD的暗电流和暗电流非均匀性的温度特性进行了对比分析。研究结果表明,MPP CCD抑制了表面暗电流,相较于非MPP CCD具有较低的暗电流和暗电流非均匀性,可以承受更高的工作温度。 相似文献
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采用双重吸杂硅片作为衬底材料,应用于CCD器件的研制工作已获得良好的效果。它使器件的暗电流明显下降,基本上消除了暗电流尖峰,同时也使器件的其它性能得到改善。目前,双吸除技术已作为一种常规工艺应用于CCD器件的制作。 相似文献
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本文主要分析硅电荷耦合器件(Si-CCD)和PtSi-SBIR CCD的暗电流来源以及降低暗电流尖峰、改善器件性能的工艺措施. 相似文献
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分析了InGaAs/InP pin光电探测器暗电流和响应度的影响因素,并对MOCVD外延工艺以及器件结构进行优化,从而提高器件响应度和降低暗电流。采用低压金属有机化学气相沉积设备(LP-MOCVD)成功制备了InGaAs/InP pin光电探测器,得到了高质量的晶体材料,InGaAs吸收层的背景浓度低于4×1014 cm-3。利用扩Zn工艺制作出感光区直径为70μm的平面光电探测器。测量结果显示,在反偏电压为5 V时,暗电流小于0.05 nA,电容约为0.4 pF。此外,在1 310 nm激光的辐照下,器件的响应度可达0.96 A/W以上。 相似文献
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为降低硅光电探测器PN结反向暗电流,可在器件制作工艺中采用一系列完美晶体器件工艺(PCDT)。在实验过程中,对吸除工艺,应力补偿工艺等作了改进,进一步降低了反向暗电流。 相似文献
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Performance analysis of a color CMOS photogate image sensor 总被引:3,自引:0,他引:3
The performance of a color CMOS photogate image sensor is reported. It is shown that by using two levels of correlated-double sampling it is possible to effectively cancel all fixed-pattern noise due to read-out circuit mismatch. Instead the fixed-pattern noise performance of the sensor is limited by dark current nonuniformity at low signal levels, and conversion gain nonuniformity at high signal levels. It is further shown that the imaging performance of the sensor is comparable to low-end CCD sensors but inferior to that reported for high-end CCD sensors due to low quantum efficiency, high dark current, and pixel cross-talk. As such the performance of CMOS sensors is limited at the device level rather than at the architectural level. If the imaging performance issues can be addressed at the fabrication process level without increasing cost or degrading transistor performance, CMOS has the potential to seriously challenge CCD as the solid-state imaging technology of choice due to low power dissipation and compatibility with camera system integration 相似文献
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像素非均匀性是CCD成像性能评价中的一个重要指标,反映的是像素结构本身的差异。传统的以灰度值为基础计算DSNU和PRNU的方法未能考虑读出电路引入的时域噪声,且计算时未剔除不同像素曝光时间不同带来的误差,计算结果也只适用于某个具体曝光量。在分析CCD信号流的基础上,厘清灰度值不均匀的影响因素。参考DSNU和PRNU的计算方法,再结合帧转移型CCD的工作方式,提出了设置多档曝光时间,每档曝光时间下采集多帧暗(亮)图像,再通过拟合求得暗电流(暗电流+光电流)后并以之为基础计算暗电流非均匀性DCNU和光电流非均匀性PCNU的方法。同时,建立CCD像素非均匀性测试系统,验证其光源的稳定性和均匀性,以排除采集图像过程中测试系统引入的时域和空间误差。在此测试系统的基础上,利用新方法测得CCD的DCNU为25.51 e-/pixels-1,PCNU为0.98%。相比于传统的DSNU和PRNU值更准确地反映了CCD像素结构的非均匀性,所得结果更具普遍适用性。 相似文献
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Ruiming Li Fang Yao Yalun Xu Songxue Bai Zhenglin Jia Qianqian Lin 《Advanced functional materials》2024,34(3):2307005
Short-wavelength infrared photo-sensing materials are dominated by germanium, indium gallium arsenide, indium antimonide, and mercury cadmium telluride. However, the complex fabrication process and high production cost hinder their widespread applications. Recently, TexSe1-x has shown great potential for infrared photodetection, but TexSe1-x-based devices are still suffering from extremely high dark current and poor device performance. In this work, high-quality TexSe1-x films are fabricated by thermal evaporation and low-temperature annealing. The optoelectronic properties of the TexSe1-x thin films are systematically investigated and optimized. The absorption spectrum is carefully tuned to cover the broad range from 300 to 1600 nm by modulating the ratio of Te and Se. Photodiodes based on the optimized TexSe1-x thin films are also fabricated, and achieve high responsivity, reduced dark and low noise current density, and a fast response time of <850 ns. Then, prototypical devices based on Te0.65Se0.35 thin films are demonstrated for optical communications, indicating the great potential for next-generation, low-cost short-wavelength infrared photodetection. 相似文献