Influence of p-GaN Annealing on Optical Properties of InGaN MQWs

近年来,n2退火和O2退火均被用于激活P-gAn中的Mg受主以提高P-gAn中的空穴浓度。基于两种退火技术,系统地研究了n2退火和O2退火对lEd样品电学性能及光学性能的影响。电流电压特性的测试结果显示,在较低温度(500℃)下O2退火就可以达到与n2高温退火(800℃)相似的电学特性。变温光致发光测试表明,n2高温退火会在IngAn量子阱中形成In团簇,In团簇作为深的势阱增加了对载流子的束缚,能够将载流子更好地局限在势阱中。然而In团簇形成的同时也伴随着大量位错的产生,使其IngAn量子阱中的位错密度大幅度提高,因此室温下n2退火样品的辐射复合效率低于O2退火样品的辐射复合效率。In recent years,thermal annealing in either N2 ambient or O2 ambient was used to activate the Mg-doped GaN epilayer and thus improve the density of holes in p-GaN.The electrical and optical properties of LED samples annealed in different ambient were systematically investigated.The test results of I-V characteristics show that samples annealed at low temperature(500 ℃) in O2 ambient and high temperature(800 ℃)in N2 ambient show similar current-voltage characteristics.The temperature-dependent photoluminescence(PL)measurement shows that high-temperature thermal annealing in N2 ambient can induce In clusters in InGaN multiple quantum well(MQWs).The deep traps induced by In clusters can work as localized centers which can enhance the confinement of carriers,the cavriers can be better boanded in well.However,there are much more dislocations out of the trap centers caused by high-temperature annealing,the dislocation density of InGaN MQWs increased significantly.Therefore,at room temperature,the radiative efficiency of the sample annealed in N2 ambient was lower than that annealed in O2 ambient.国家自然科学基金(10974165;91023048;61106044); 高等学校博士学科点专项科研基金(20110121110029

智能型锂电池化成检测系统的设计与实现

提出了一种智能程控、可靠性高、结构简化、成本低廉、高度模块化和具有良好可扩展性的多功能化成系统,该系统用于组成新能源锂离子电池生产与研究的规模庞大的多功能化成物联网,着眼于解决传统化成和检测方法的低效率、可扩展性差和高误差率等缺陷。文章介绍了系统的基本功能、硬件构成与设计以及系统的软件设计,实践证明该系统能够在实际应用中大大提高化成的效率和分选的精确性

Video-assisted Thoracoscopic 3D Mode Operation for Solitary Pulmonary Nodules

目的探讨三维胸腔镜手术(3d VIdEO-ASSISTEd THOrACIC SurgEry,3d-VATS治疗孤立性肺结节(SOlITAry PulMOnAry nOdulE,SPn)的效果。方法回顾性分析2013年3月~2014年3月50例SPn的资料,采用3d-VATS手术模式楔形切除结节,根据快速病理结果决定是否行肺叶切除加淋巴结清扫术。统计手术时间(去除快速冰冻时间)、术后24 H引流量、总引流量、引流管拔除时间、淋巴结清扫数及术后并发症等。结果 3d-VATS模式下,50例均行肺结节楔形切除,其中23例病理为恶性,继续行肺癌根治术,手术顺利。肺癌根治术手术时间(62±12)MIn,术中出血量(35±5)Ml,清扫淋巴结(19±3)个,术后24 H引流量(120±20)Ml,术后胸管引流时间(4±1)d,术后住院时间(7±2)d。并发症3例,其中术后肺炎2例,阵发性心房纤颤1例,均治愈。无围手术期死亡。随访2~12个月,平均6.3月。1例术后3个月脑转移,1例术后5个月肺癌复发。结论胸腔镜3d模式下治疗SPn是一种新的选择方式,安全可行,值得推广应用。Objective To evaluate the effects of surgical treatment for solitary pulmonary nodules under thoracoscopic 3D mode(3D-VATS).Methods A total of 50 cases of solitary pulmonary nodules from March 2013 to March 2014 were retrospectively analyzed.Intraoperative wedge pulmonary resection with 3D-VATS was utilized.According to intraoperative pathological findings,lobectomy plus lymph node dissection was given or not.Intraoperative time( minus fast freezing time),drainage volume for 24 h,total drainage volume,drainage tube removal time,number of lymph node dissected,and postoperative complications were recorded.Results Under 3D-VATS mode,50 cases of solitary pulmonary nodules were treated with wedge resection,including 23 cases of malignant pathology receiving radical resection, which was smoothly.The radical resection time( lung lobectomy plus lymphadenectomy) was(62 ± 12) min,the bleeding volume was(35 ± 5) ml,the lymphadenectomy number was 19 ± 3,the drainage volume for 24 h was(120 ± 20) ml,the postoperative chest tube removal time was(4 ± 1) days,and the postoperative hospital stay was(7 ± 2) days.Postoperative complications occurred in 3 cases,including 2 cases of pneumonia and 1 case of paroxysmal atrial fibrillation.No perioperative deaths were observed.All the cases were followed up for 2- 12 months,with an average of 6.3 months.Brain metastases was found in 1 case at the third postoperative month and recurrence of lung cancer was noted in 1 case at the fifth postoperative month.Conclusion Thoracoscopic 3D mode treatment for solitary pulmonary nodules is a new,safe,and feasible alternative and should be widely applied

Combined Use of Thoracoscopy and Laparoscopy in Total Laryngectomy for Cervical Esophageal Carcinoma

目的探讨胸、腹腔镜联合全喉切除治疗颈段食管的可行性和疗效。方法 2009年1月~2014年7月胸、腹腔镜联合全喉切除治疗33例颈段食管癌。胸腔镜下分离食管、腹腔镜下管胃成形、全喉切除、气管永久造口、胃咽吻合术。结果胸部手术时间40~66 MIn,平均53 MIn;腹部手术时间35~51 MIn,平均44 MIn;颈部手术时间128~150 MIn,平均139 MIn。术中出血量130~270 Ml,平均150 Ml。术后住院时间8~14 d,平均12 d。病理均为鳞状细胞癌,其中高分化2例,中分化19例,中-低分化7例,低分化5例。切缘病理学检查无癌组织残留。31例淋巴结转移。并发症:吻合口漏2例,喉返神经损伤3例,肺部感染6例,胃排空障碍2例,吻合口狭窄1例,无死亡病例。33例随访1个月~5年,术后1、3、5年生存率分别为87.9%、54.5%、45.5%。结论颈段食管癌应采取积极的手术治疗,胃咽吻合术是颈段食管癌切除后较为理想的修复手段。Objective To investigate clinical feasibility and efficacy of combined use of thoracoscopy and laparoscopy in total laryngectomy for cervical esophageal carcinoma.Methods Clinical data of 33 patients with cervical esophageal carcinoma undergoing surgical treatment in our department from January 2009 to July 2014 were analyzed retrospectively.The esophagus was separated under thoracoscopy.And laparoscopic gastroplasty,total laryngectomy,tracheal permanent colostomy,and gastric pharyngeal anastomosis were performed.Results The thoracoscopic operation time was 40- 66 min( mean,53 min),the laparoscopic operation time was 35- 51 min( mean,44 min),and the cervical operation time was 128- 150 min( mean,139 min).The blood loss was 130- 270 ml( mean,150 ml).The postoperative hospital stay was 8- 14 d( mean,12 d).Pathological examinations showed squamous cell carcinoma in all the cases,including 2 cases of highly differentiated carcinoma,19 cases of moderately differentiated carcinoma,7 cases of moderately or lowly differentiated carcinoma,and 5 cases of lowly differentiated carcinoma.No residual cancer was found at cutting edges pathologically.Among the 33 cases,lymph node metastasis was found in 31 cases.Complications included 2 cases of anastomotic fistula,3 cases of recurrent laryngeal nerve injury,6 cases of pulmonary infection,2cases of delayed gastric emptying,and 1 case of anastomotic stenosis.There was no death.All the patients were followed up for 1months to 5 years.The survival rates at 1,3,and 5 postoperative year were 87.9%,54.5%,and 45.5%,respectively.Conclusions Cervical esophageal carcinoma should be surgically treated actively.Gastric pharyngeal anastomosis is an ideal option for the repair of cervical esophageal cancer resection

Carrier Dynamics in Low-dimensional InGaN Materials and Fabrication of GaN-based Green-emitting VCSELs

GaN基宽禁带半导体材料是直接带隙半导体材料，复合效率高，且具有优异的物理、化学特性，其合金材料的禁带宽度可以从0.7eV到6.2eV连续可调，对应的光波长覆盖了红外-可见-紫外光范围，已被广泛应用于制作高效率半导体光电器件，特别是蓝绿光波段的发光器件。尽管GaN基发光器件，如发光二极管(LED)、激光二极管(LD)等，已经实现商业化并持续快速发展，但对于器件的核心组成部分——有源区的光学性质以及载流子动力学的研究还相对滞后。为了进一步优化有源区结构，提高器件发光效率，必须要详细透彻地分析载流子在有源区内的输运及复合过程。本论文围绕InGaN量子阱和InGaN量子点等低维材料的结构设计、光学性...GaN-based wide-band gap semiconductors are direct-gap semiconductors, which have high radiative efficiency. Due to their oustanding physical and chemical properties, and the tunable band gaps which cover the whole visible spectral region (from 0.7 eV to 6.2 eV), GaN and its ternary alloys have been widely used to obtain high performance photoelectric devices, especially for the blue and green ligh...学位：工学博士院系专业：物理与机电工程学院_微电子学与固体电子学学号：1982012015390