A simulation study of polarization characteristics of ultrathin CsPbBr3 nanowires with different cross-section shapes and sizes

• Published in: Chinese physics B 2023-01, Vol.32 (2), p.388-393
• Main Authors: Yang, Kang, Hu, Huiqing, Wang, Jiaojiao, Deng, Lingling, Lu, Yunqing, Wang, Jin
• Format: Article
• Language: English
• Subjects: CsPbBr; nanowire; polarization characteristics
• ISSN: 1674-1056
• DOI: 10.1088/1674-1056/ac744d

The polarization characteristics of ultrathin CsPbBr3 nanowires are investigated.Especially,for the height of cross-section of nanowires between 2 nm and 25 nm,the normalized intensity and polarization ratio p of CsPbBr3 nanowires with triangular,square and hexagonal cross-section shapes are compared.The results show that,along with the increase of the height of cross-section,the polarization ratios of these three nanowires decrease until T=15 nm,and increase afterwards.Also,along with the increase of the cross-section area up to 100 nm2,the polarization ratios of these three nanowires increase too.In general,for the same height or area,the polarization ratio p of these nanowires follows Phexagon＞Psquare＞Ptriangle Therefore,the nanowire with the hexagonal cross-section should be chosen,where for a cross-section height of 2 nm and a length-height ratio of 20:1,the maximal polarization ratio is 0.951 at the longitudinal center of the NW.Further,for the hexagonal NW with a cross-section height of 10 nm,the hexagonal NW with a length-height ratio of 45:1 exhibits the maximal polarization ratio at the longitudinal center of the NW.These simulation results predict the feasible size and shape of CsPbBr3 nanowire devices with high polarization ratios.