本文選題：銅納米顆粒陣列 + 表面等離子體共振�。� 參考：《合肥工業(yè)大學》2017年碩士論文

【摘要】：近些年來,貴金屬(如金、銀)納米結(jié)構(gòu)已經(jīng)被廣泛采用來增加各類光電器件的性能,如光伏器件,光電探測器,波導(dǎo)器件等。作為傳統(tǒng)貴金屬的可替代物,普通金屬(如銅,鋁等)由于具有相對低廉的制備成本及可協(xié)調(diào)的等離子體波長等優(yōu)點,基于它們的表面等離子體光電器件也受到越來越多研究者的興趣。大量的研究報道表明,等離子體納米結(jié)構(gòu)與半導(dǎo)體結(jié)合是改善各種光電器件性能的可靠途徑。此外,高度局域的電磁場能產(chǎn)生大量的電子-空穴對,并能越過勢壘從等離子體材料注入到半導(dǎo)體材料中,從而增強光電流。所以在本文中,我們提出了一種新的基于等離子銅納米顆粒陣列修飾的石墨烯/硒化鎘納米帶肖特基結(jié)近紅外光電探測器。文中,我們通過有限元法對銅納米顆粒陣列的光學特性進行了理論模擬,發(fā)現(xiàn)當銅納米顆粒陣列的尺寸改變時,其等離子體特性也會呈現(xiàn)差異。并隨著顆粒邊長和厚度的變化,銅納米顆粒陣列在700到900nm范圍呈現(xiàn)很明顯的局域表面等離子體共振效應(yīng)。通過對修飾銅納米顆粒陣列前后的石墨烯/硒化鎘納米帶肖特基結(jié)近紅外光電探測器的光電性能進行對比分析,我們發(fā)現(xiàn)修飾了銅納米顆粒陣列后,器件的光電流從0.124增大到3.1mA,增強了將近24倍。此外,其他的器件參數(shù)(比如響應(yīng)度、增益)也得到了相應(yīng)的提高。結(jié)合有限元法的理論模擬,我們發(fā)現(xiàn)器件性能的優(yōu)化主要得益于LSPR誘導(dǎo)的熱電子注入效應(yīng)。這些研究結(jié)果表明等離子體銅納米顆粒陣列是提高納米光電器件光電性能的非常有潛力的候選者。
[Abstract]:In recent years, noble metals (such as gold, silver) nanostructures have been widely used to increase the performance of various photovoltaic devices, such as photovoltaic devices, photodetectors, waveguide devices and so on.As a substitute for traditional precious metals, ordinary metals (such as copper, aluminum, etc.) have the advantages of relatively low preparation cost and compatible plasma wavelength.Surface plasma optoelectronic devices based on them have also attracted more and more researchers' interest.A large number of research reports show that the combination of plasma nanostructures and semiconductors is a reliable way to improve the performance of various optoelectronic devices.In addition, highly localized electromagnetic fields can produce a large number of electron-hole pairs and can be injected from plasma materials into semiconductor materials over potential barriers, thus enhancing photocurrent.In this paper, we propose a novel Schottky junction near infrared photodetector based on plasma copper nanoparticles array modified graphene / cadmium selenide nanoribbons.In this paper, we theoretically simulate the optical properties of copper nanoparticles array by finite element method. It is found that the plasma characteristics of copper nanocrystalline array are different when the size of the array changes.With the change of the side length and thickness of the particles, the local surface plasmon resonance (SPR) effect is obvious in the range of 700 to 900nm.By comparing and analyzing the photoelectric properties of graphene / cadmium selenide nanospheres Schottky junction near infrared photodetectors before and after modification of copper nanoparticles array, we found that after modification of copper nanoparticles array,The photocurrent of the device increased nearly 24 times from 0.124 to 3.1 Ma.In addition, other device parameters (such as responsivity, gain) are also improved.Combined with the theoretical simulation of finite element method, we find that the optimization of device performance is mainly due to the hot electron injection effect induced by LSPR.These results indicate that the plasma copper nanoparticles array is a promising candidate for improving the optoelectronic performance of nano-optoelectronic devices.
【學位授予單位】：合肥工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN215

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