基於掌性鈣鈦礦之自旋發光二極體
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2025
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本篇論文主旨在研究引用新型鈣鈦礦材料(MB〖A)〗_2 CuCl_4，此材料具有極強的旋光度，利用圓二色性光譜儀測量其旋光特性發現其不對稱因子g-factor在波長383nm處可達到0.08。為了研究此材料在自旋發光二極體上的應用，我們在文章中會引用另一種鈣鈦礦材料(MB〖A)〗_2 PbBr_4作為對比，此材料在研究的歷史上相對成熟，已經有許多研究與文章可做參考，因此選擇作為對比對象。在研究完兩材料的特性比對後，我們會開始研究將兩者投入至自旋發光二極體的結構中。目前在自旋發光二極體的文章中大部分都是透過對進入元件中的電洞作自旋極化，而這就是本篇文章想要做的第二部分，試圖去實現在發光二極體的結構中以電子作自旋極化的可能性。利用(MB〖A)〗_2 PbBr_4製成的自旋發光二極體具有1.14%的外部量子效率以及0.01的圓偏振電致發光不對稱因子，而(MB〖A)〗_2 CuCl_4的自旋發光二極體具有0.11%的外部量子效率以及0.007的圓偏振電致發光不對稱因子，成功實現了可以透過電致發光發出旋光的電子自旋選擇發光二極體。
This study focuses on investigating a novel perovskite material, (MB〖A)〗_2 CuCl_4,which exhibits exceptionally strong chiroptical properties. Circular dichroism(CD) spectroscopy revealed that material achieves an asymmetric factor(g-factor) of up to 0.08 at wavelength of 383nm.To explore its potential application in spin light-emitting diode(spin-LED),we compare (MB〖A)〗_2 CuCl_4 with another perovskite material, (MB〖A)〗_2 PbBr_4,which has been extensively studied and serves as a benchmark for our research due to the availability of substantial prior work and literature.After characterizing and comparing the properties of these two materials, we proceeded to integrate them into spin-LED structures. Most existing spin-LED studies focus on spin polarization of holes injected into the device. This research aims to investigate the feasibility of achieving spin polarization of electrons within the LED structure. Spin-LED fabricated using (MB〖A)〗_2 PbBr_4 demonstrated an external quantum efficiency(EQE) of 1.14% and a circularly polarized electroluminescence(CPEL) asymmetric factor of 0.01.In contrast, spin-LED based on (MB〖A)〗_2 CuCl_4 exhibited an EQE of 0.11% and a CPEL asymmetric factor of 0.007.These results successfully demonstrate the potential for electron spin selective chiral electroluminescence using spin-LED.
This study focuses on investigating a novel perovskite material, (MB〖A)〗_2 CuCl_4,which exhibits exceptionally strong chiroptical properties. Circular dichroism(CD) spectroscopy revealed that material achieves an asymmetric factor(g-factor) of up to 0.08 at wavelength of 383nm.To explore its potential application in spin light-emitting diode(spin-LED),we compare (MB〖A)〗_2 CuCl_4 with another perovskite material, (MB〖A)〗_2 PbBr_4,which has been extensively studied and serves as a benchmark for our research due to the availability of substantial prior work and literature.After characterizing and comparing the properties of these two materials, we proceeded to integrate them into spin-LED structures. Most existing spin-LED studies focus on spin polarization of holes injected into the device. This research aims to investigate the feasibility of achieving spin polarization of electrons within the LED structure. Spin-LED fabricated using (MB〖A)〗_2 PbBr_4 demonstrated an external quantum efficiency(EQE) of 1.14% and a circularly polarized electroluminescence(CPEL) asymmetric factor of 0.01.In contrast, spin-LED based on (MB〖A)〗_2 CuCl_4 exhibited an EQE of 0.11% and a CPEL asymmetric factor of 0.007.These results successfully demonstrate the potential for electron spin selective chiral electroluminescence using spin-LED.
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自旋發光二極體, 掌性自旋誘導選擇性, spin light-emitting diode, Chiral Induced Spin Selectivity