Improved Electronic Transport Properties in Template-Grown CsPbBr3 Nanorods as Revealed by Dielectric Force Microscopy

Y. Stephanie Li, E. Avila-Lopez, S. Liang, I. Elias, and Z. Lin
California State University-Bakersfield,
United States

Keywords: Perovskite, CsPbBr3, Nanorod, Nanowire, Electronic Transport Properties, Scanning Probe Microscopy


We synthesize all-inorganic perovskite CsPbBr3 NRs with tailored dimensions, using amphiphilic bottlebrush-like block copolymer (BBCP) as nanoreactors [1]. A novel contactless scanning probe microscopy (SPM)-based imaging technique, dielectric force microscopy (DFM), is employed to probe the electronic transport properties in these template-grown CsPbBr3 NRs. In stark contrast to the electronic heterogeneity observed in CsPbBr3 NWs synthesized via a conventional hot-injection method [2], we find that all freshly prepared CsPbBr3 NRs exhibit ambipolar behaviors which remain up to two months [3]. A transition from ambipolar to p-type behaviors occur after two months, and nearly all CsPbBr3 NRs change to p-type within two weeks [3]. Furthermore, template-grown CsPbBr3 NRs display improved nanoscale electronic homogeneity compared to conventional CsPbBr3 NWs [2,3]. The remarkable improvement of electronic uniformity and nanoscale homogeneity in template-grown CsPbBr3 NRs, over conventional CsPbBr3 NWs, makes them promising materials for optoelectronic applications. This work is supported by National Science Foundation (NSF) Grant Numbers DMR 1904042 and DMR 1903990. References: [1] S. Liang, M. Zhang, S. He, M. Tian, W. Choi, T. Lian, and Z. Lin, Nat. Synth. 2, 719-728 (2023). [2] Y. S. Li, S. Liang, T. Trieu, R. R. Bautista, and Z. Lin, ACS Appl. Energy Mater. 5, 4431-4438 (2022). [3] E. Avila-Lopez, S. Liang, I. Elias, Z. Lin, and Y. S. Li, submitted (2023).