本文關(guān)鍵詞：雜化金屬鹵化物鈣鈦礦晶體的合成制備　出處：《南京大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 關(guān)鍵字納米材料 納米結(jié)構(gòu) 雜化金屬鹵化物鈣鈦礦材料

【摘要】：雜化金屬鹵化物鈣鈦礦晶體材料是由有機組分和無機組分通過有序自組裝的形成,合成的有機無機雜合物,具有易合成,生產(chǎn)成本低廉的特點,可以使用卷對卷技術(shù)(Roll-to-Roll)進行大規(guī)模的工業(yè)化生產(chǎn),有利于以后市場的推廣。在分子尺度上,雜化金屬鹵化物鈣鈦礦晶體材料是有機無機雜合物,擁有有機物和無機物的部分性質(zhì),并且雜化金屬鹵化物鈣鈦礦晶體材料屬于有直接帶隙的新型半導(dǎo)體類的材料。因此在發(fā)光器件或者是探測器件中,雜化鈣鈦礦晶體材料可以被用來作為器件的發(fā)光層或者是有源層。雜化金屬鹵化物鈣鈦礦結(jié)構(gòu)的載流子遷移率較高,擁有可調(diào)節(jié)的禁帶寬度,擴散長度可以達(dá)到微米量級。在太陽能電池、發(fā)光二極管、光探測器和激光等應(yīng)用領(lǐng)域,雜化金屬鹵化物鈣鈦礦擁有很大的競爭力。由于雜化金屬鹵化物鈣鈦礦晶體在光電子領(lǐng)域有著很大的潛在應(yīng)用價值,因此我們比較了目前雜化金屬鹵化物鈣鈦礦晶體材料的多種合成方法,并在這些方法的基礎(chǔ)上:1、提出了 MAI醇溶液密封法,首先在FTO襯底上旋涂一層PbBr2薄膜,再將襯底放入到MAI醇溶液中,不但可以利用醇溶液隔絕外界的氧氣(02)和水氣(H20),避免鈣鈦礦在形成過程中分解,也可以使PbBr2和MAI更加充分的反應(yīng),從而得到高質(zhì)量的有機無機雜化金屬鹵化鈣鈦礦晶體。MAI醇溶液密封法的優(yōu)勢就在于在無手套箱的條件下,能夠以低成本、更加簡便、可重復(fù)的方式獲得穩(wěn)定和高質(zhì)量的雜化鈣鈦礦晶體薄膜。2、通過XRD、EDS以及PL譜的測試,我們對獲得的雜化金屬鹵化物鈣鈦礦晶體材料進行了表征,研究影響雜化鈣鈦礦晶體材料的因素,進一步地分析雜化鈣鈦礦晶體材料的形貌演化方面的機制。通過對合成的鈣鈦礦試驗參數(shù)的調(diào)節(jié),包括DMF的濃度和浸泡時間因素,實現(xiàn)了對鈣鈦礦形貌的控制,觀察到其形貌從納米立方到納米線,再到納米片,最后成為微米級立方晶體的演化過程。在生長初期,鈣鈦礦納米晶體受到DMF溶液控制,趨向于一維生長,但隨著鈣鈦礦量的增加,由于能量最低原則,驅(qū)使鈣鈦礦晶體三維生長成微米級立方晶體。實驗觀察到制備的鈣鈦礦晶體具有很強的光致發(fā)光現(xiàn)象,發(fā)光峰位可以從746nm到770nm變化,這種紅移是由于I-離子不同程度的取代晶格中的Br-離子。
[Abstract]:Hybrid metal halide perovskite crystal materials are composed of organic and inorganic components through orderly self-assembly, the synthesis of organic-inorganic hybrids has the characteristics of easy synthesis and low production cost. Roll-to-Roll technology can be used for large-scale industrial production, which is conducive to the future promotion of the market, in the molecular scale. Hybrid metal halide perovskite crystal materials are organic-inorganic hybrids with some properties of organic and inorganic compounds. And the hybrid metal halide perovskite crystal material belongs to a new type semiconductor material with direct band gap. Hybrid perovskite crystal can be used as the luminescent layer or active layer of the device. The hybrid metal halide perovskite has high carrier mobility and adjustable bandgap. Diffusion lengths can reach microns. In solar cells, light-emitting diodes, photodetectors and laser applications. Hybrid metal halide perovskite has great competitive power. Because hybrid metal halide perovskite crystal has great potential application value in optoelectronics field. Therefore, we compare various synthesis methods of hybrid metal halide perovskite crystal materials, and on the basis of these methods, we propose MAI alcohol solution sealing method. Firstly, a PbBr2 film is spin-coated on the FTO substrate, and then the substrate is put into the MAI alcohol solution, which can not only use the alcohol solution to insulate the oxygen (02) and the water vapor (H20). To avoid the decomposition of perovskite in the formation process, PbBr2 and MAI can be more fully reacted. Thus, the advantage of high quality organic and inorganic hybrid metal halide perovskite crystal. Mai alcohol solution sealing method is that it can be cheaper and simpler under the condition of no glove box. Stable and high quality hybrid perovskite crystal thin films. 2 were obtained in a repeatable manner and tested by XRDX EDS and PL spectra. The hybrid metal halide perovskite crystal materials were characterized and the factors affecting the hybrid perovskite crystal materials were studied. The mechanism of morphology evolution of hybrid perovskite crystal materials was further analyzed. The parameters of the synthetic perovskite were adjusted including the concentration of DMF and the soaking time. The morphology of perovskite was controlled. The morphology of perovskite was observed from nanocrystalline to nanowire, then to nanoscale, and finally to the evolution of micron cubic crystal. Perovskite nanocrystals are controlled by DMF solution and tend to grow in one dimension, but with the increase of perovskite content, the energy is the lowest. It is observed that the prepared perovskite crystal has strong photoluminescence, and the luminescence peak can change from 746 nm to 770 nm. This redshift is due to the varying degree of substitution of I-ions for Br- ions in lattice.
【學(xué)位授予單位】：南京大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：O78

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本文編號：1419228