於氮化鎵奈米結構內鈣鈦礦奈米晶體的穿透式電子顯微研究

Abstract

鈣鈦礦材料除了在光伏應用中展現出巨大潛力外，亦適合於高效率發光應用。然而，除非形成奈米晶體結構，鈣鈦礦的發光效率相當低。在本研究中，我們將溴化銫鉛(CsPbBr₃)前驅溶液填入氮化鎵奈米孔隙結構中，形成鈣鈦礦奈米晶體。我們通過穿透式電子顯微鏡與能量分散X射線光譜量測探討這類奈米尺度腔體結構中的鈣鈦礦奈米晶體形貌與分佈。此外，我們對其發光行為進行簡要研究。通過毛細作用，鈣鈦礦前驅溶液可以流入水平奈米孔隙結構中的管狀孔洞，該孔隙結構可通過在樣品上製作條帶檯面圖案來實現。經固化後，鈣鈦礦奈米晶體能夠在管狀孔洞內形成，實現高效發光。鈣鈦礦奈米晶體亦可形成於垂直奈米孔隙結構內。

Perovskite has great potential for the high-efficiency light emission application besides its photovoltaic application. However, its emission efficiency is low unless a nanocrystal structure is formed. In this research, we insert the precursor solution of CsPbBr3 into GaN nano porous structures to form perovskite nanocrystals. Particularly, through transmission electron microscopy and energy dispersive X-ray spectroscopy, we investigate the nanocrystal morphology and distribution in such a nanoscale cavity structure. The light emission behavior is also briefly studied. Through the capillary action, the precursor solution of perovskite can flow into the pipeline line pores in a horizontal nano-porous structure, which can be formed by fabricating a stripe mesa pattern on the sample. After solidification, perovskite nanocrystals can be formed inside the pipeline like pores for effective emission. Perovskite nanocrystals can also be formed in a vertical nano-porous structure.