共查询到17条相似文献,搜索用时 78 毫秒
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研究了GaN/AlGaN异质结背照式P-i-n结构可见盲紫外探测器的制备与性能.GaN/MGaN外延材料采用金属有机化学气相沉积(MOCVD)方法生长,衬底为双面抛光的蓝宝石,缓冲层为AiN,n型层采用厚度为0.8 μm的Si掺杂Al0.3Ga0.7形成窗口层,i型层为0.18 μm的非故意掺杂的GaN,P型层为0.15 μm的Mg掺杂GaN.采用C12、Ar和BCl3感应耦合等离子体刻蚀定义台面,光敏面面积为1.96×10-3cm2.可见盲紫外探测器展示了窄的紫外响应波段,响应区域为310-365 nm,在360 nm处响应率最大,为0.21 A/W,在考虑表面反射时,内量子效率达到82%;优质因子R0A为2.00×108 Ω·cm2,对应的探测率D*=2.31×1013·Hz1/2·W-1;且零偏压下的暗电流为5.20×10-13A. 相似文献
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介绍了InGaN紫外探测器的研制过程,并给出了器件的性能。利用金属有机化学气相沉积(MOCVD)方法生长GaN外延材料,通过刻蚀、钝化、欧姆接触电极等工艺,制作了正照射单元In0.09Ga0.91N紫外探测芯片。并对该芯片进行了I-V特性、响应光谱等测试,得到芯片的暗电流Id为1.00×10-12 A,零偏压电阻R0为1.20×109Ω。该紫外探测器在360~390nm范围内有较高的响应度,峰值响应率在378nm波长处达到0.15A/W,在考虑表面反射时,内量子效率达到60%;优质因子R0A为3.4×106Ω·cm2,对应的探测率D*=2.18×1012 cm·Hz1/2·W-1。 相似文献
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A. Teke S. Dogan L. He D. Huang F. Yun M. Mikkelson H. Morkoç S. K. Zhang W. B. Wang R. R. Alfano 《Journal of Electronic Materials》2003,32(5):307-311
The spectral response of back-surface-illuminated p-GaN-i-GaN/AlGaN multiplequantum well (MQW)-n-AlGaN ultraviolet (UV) photodetector
is reported. The structure was grown by molecular-beam epitaxy on a c-plane sapphire substrate. A MQW is introduced into the
active region of the device to enhance the quantum efficiency caused by the high absorption coefficient of the two-dimensional
(2-D) system. Another advantage of using MQW in the active region is the ability to tune the cutoff wavelength of the photodetector
by adjusting the well width, well composition, and barrier height. The zero-bias peak responsivity was found to be 0.095 A/W
at 330 nm, which corresponds to 36% quantum efficiency from as-grown p-i-n GaN/AlGaN MQW devices. An anomalous effect, occurring
in responsivity as a negative photoresponse in the spectra peaked at 362 nm because of poor ohmic contact to p-type GaN, was
also observed. Etching the sample in KOH for 30 sec before fabrication removed the surface contaminants and improved the surface
smoothness of the as-grown sample, resulting in significant improvement in the device performance, giving a peak responsivity
of 0.12 A/W. The device has a quantum efficiency of 45% at 330 nm without the anomalous negative photocurrent. 相似文献
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Yuan Tingting Liu Xinyu Zheng Yingkui Li Chengzhan Wei Ke Liu Guoguo 《半导体学报》2009,30(12):124001-124001-3
Surface treatment plays an important role in the process of making high performance AIGaN/GaN HEMTs. A clean surface is critical for enhancing device performance and long-term reliability. By experiment-ing with different surface treatment methods, we find that using UV/ozone treatment significantly influences the electrical properties of Ohmic contacts and Schottky contacts. According to these experimental phenomena and X-ray photoelectron spectroscopy surface analysis results, the effect of the UV/ozone treatment and the reason that it influences the Ohmic/Schottky contact characteristics of A1GaN/GaN HEMTs is investigated. 相似文献
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p-i-n结构GaN光电探测器性能的研究 总被引:3,自引:1,他引:3
近年来,可见盲与太阳盲光电探测器在火灾监控、太空通信和导弹尾焰探测等方面的应用引起了越来越多的关注。由于氮化镓(GaN)是直接宽带隙半导体材料,所以成为了在可见区与紫外区的光电器件的首选材料,而p-i-n结构的器件因其响应度高、暗电流低、便于集成等优点倍受人们的青睐。采用金属有机气相外延(MOCVD)法制备了p-i-n结构的GaN紫外光电探测器。在此基础上,采用N2气氛下热退火处理的方法,提高了p型GaN层的载流子浓度,从而降低了器件的暗电流。器件在1 V偏压下,暗电流仅为65 pA。器件在1 V偏压下的最大响应度值出现在361 nm处,大小为0.92 A/W。 相似文献
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Design,fabrication and characterization of a novel two-color detector for ultraviolet and infrared applications are reported.The detector has a simple multilayer structure composed of n-Al_(0.3)Ga_(0.7)N/i-GaN/p-GaN /SiO_2/LaNiO_3/PZT/Pt fabricated on a sapphire substrate.Ultraviolet and infrared properties are measured.For the ultraviolet region,a flat band spectral response is achieved in the 302-363 nm band.The detector displays an unbiased responsivity of 0.064 AAV at 355 nm.The current-voltage curve... 相似文献
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本文报道了一种新型紫外红外应用的探测器的设计、制备及其性能。探测器由蓝宝石衬底上生长的p-GaN/i-GaN/n-Al0.3Ga0.7N/SiO2/LaNiO3/PZT/Pt多层结构组成。分别测量了紫外和红外的性能。紫外部分,光谱响应范围在302-363nm波段;在波长355nm,探测器零偏响应率为0.064A/W;I-V测量表明零偏暗电流为-1.57×10-12A;该探测器的探测率为1.81×1011cmHz1/2W-1。红外部分,在波长4μm处,探测器响应率为1.58×105cmHz1/2W-1。 相似文献