本文關鍵詞：采用石墨烯透明電流擴展層提高光子晶體GaN LED性能的研究　出處：《北京工業(yè)大學》2015年碩士論文　論文類型：學位論文

  更多相關文章： 氮化鎵基LED 石墨烯 光子晶體

【摘要】：發(fā)光二極管,是一種將電能轉換為光能的新型、節(jié)能、環(huán)保的半導體元器件。它被廣泛應用在顯示、照明等各個領域,被認為是最有可能取代傳統(tǒng)高能耗光源的第四代光源。目前在LED家族中,氮化鎵(GaN)LED占有重要地位,GaN已經(jīng)成為制造LED的主流材料。氧化銦錫(ITO)是GaN LED中應用最廣泛的透明電極材料,但是由于ITO存在化學穩(wěn)定性差、紫外光波段透光率低、銦資源稀缺而價格高昂等問題,尋找能夠替代ITO作為透明電流擴展層的材料顯得很有必要。石墨烯因具有優(yōu)良的光電性能而應用于光電器件中,但是還很少有關在光子晶體LED中利用石墨烯作透明電流擴展層的報道。本文是關于采用石墨烯電流擴展層提高光子晶體LED性能的研究。本文的主要研究內(nèi)容如下:(1)器件光子晶體結構的上方鋪石墨烯作為電極,設計制備了石墨烯作為透明電流擴展層的二維空氣孔光子晶體LED。制備出了包括采用石墨烯作電流擴展層的光子晶體LED在內(nèi)的9種器件。(2)通過查閱相關文獻和多次試驗,深入研究光子晶體LED的制備工藝和轉移石墨烯等關鍵工藝,確定了工藝步驟和工藝參數(shù)。(3)研究了光子晶體LED表面的石墨烯電流擴展作用,特別是光子晶體空氣孔上懸浮的石墨烯對于電流擴展的顯著提高作用。發(fā)現(xiàn)懸浮部分的高電導率可帶來石墨烯平均方阻減小,可使石墨烯作為電流擴展層的光子晶體LED發(fā)光功率大幅提高,工作電壓大幅降低。(4)利用COMSOL軟件對實驗器件進行了模擬。解釋了光子晶體刻蝕導致的LED表面電流擴展惡化,以及石墨烯對電流擴展所起的重要作用。(5)對器件進行了測試和分析。測試和分析了石墨烯電流擴展層的透光率、器件電流擴展效果、器件的I-V特性等。重點分析了器件的光電性能。
[Abstract]:Light emitting diodes (LEDs) are a new type of semiconductor components that convert electric energy into light energy. It is widely used in display, lighting and other fields. It is considered to be the 4th generation light source which is most likely to replace the traditional high energy consumption light source. At present, gallium nitride gan LED plays an important role in the LED family. Indium tin oxide (ITO) is the most widely used transparent electrode material in GaN LED, but the chemical stability of ITO is poor. The ultraviolet band transmittance is low, the indium resource is scarce and the price is high. It is necessary to find a material that can replace ITO as a transparent current extension layer. Graphene is used in optoelectronic devices because of its excellent photoelectric properties. However, there are few reports on the use of graphene as transparent current extender in photonic crystal LED. This paper is about the improvement of photonic crystal LED performance by using graphene current extension layer. It reads as follows:. (. 1) the graphene is used as the electrode on the top of photonic crystal structure. A two-dimensional air-hole photonic crystal (LED) with graphene as a transparent current extension layer was designed and fabricated. Nine kinds of devices, including photonic crystal LED with graphene as the current extender, were fabricated. By consulting relevant literature and many experiments. The preparation and transfer of graphene in photonic crystal LED were studied. The process steps and process parameters were determined. The effect of graphene current propagation on the surface of photonic crystal LED was studied. In particular, the effect of graphene suspended on the air hole of photonic crystal on the current propagation is significantly improved. It is found that the high conductivity of the suspended part can reduce the average square resistance of graphene. The photonic crystal LED luminescence power of graphene as the current spreading layer can be greatly increased. The COMSOL software is used to simulate the experimental devices and explain the deterioration of LED surface current expansion caused by photonic crystal etching. And graphene plays an important role in current spread. The device is tested and analyzed. The transmittance of graphene current spreading layer and the effect of device current expansion are tested and analyzed. The I-V characteristics of the device are analyzed, and the photoelectric performance of the device is analyzed.
【學位授予單位】：北京工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TN312.8
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本文編號：1378802