[17a-P02-1~7] 12.8 Specific theme: Photoelectric Properties, Device Fabrication and Structural Controls of Organic-Inorganic Hybrid Perovskites

[17a-P02-2] Clarification of Factors of Substituent Spacing Control of Zwitterionic Ligands on the Photostability of CsPbBr3 Perovskite Nanocrystals

〇(B)Takuro Iizuka¹, Yusaku Morikawa², Motofumi Kashiwagi³, Satoshi Asakura⁴, Akito Masuhara^2,5 (1.GFac. of Eng., Yamagata Univ., 2.Grad. Sch. of Sci. and Eng., Yamagata Univ., 3.Zeon. Corp., 4.Ise Chem. Corp., 5.FROM, Yamagata Univ.)

Keywords:

perovskite,nanocrystals,semiconductor nanocrystals

Perovskite nanocrystals (PeNCs) are next-generation optical materials that exhibit excellent optical properties such as high photoluminescence quantum yield (PLQY > 80%) and narrow width of emission spectra (FWHM < 25 nm). However, the photoirradiation required to excite PeNCs causes significant degradation of their optical properties due to the desorption of the surface capping ligands that passivate PeNCs upon photoirradiation, leading to the formation of surface defects and aggregation of PeNCs. In contrast, a previous study reported that using Stearyl betaine(zwitterionic-type ligands), a zwitterionic ligand with two substituents, strongly suppressed the desorption of ligands on the surface of PeNCs. However, it is still unknown what the key factors are that suppress the desorption of ligands. In this work, we synthesized varying the substituent spacing of zwitterionic ligands to investigate its influence on the ligands desorption. Our research has clarified that zwitterionic ligands have intrinsic properties that enable significant suppression of ligand desorption when exposed to photoirradiation.