Surface Modification of Black Phosphorus with Group 13 Lewis Acids for Ambient Protection and Electronic Tuning.

Surface Modification of Black Phosphorus with Group 13 Lewis Acids for Ambient Protection and Electronic Tuning. Angew Chem Int Ed Engl. 2021 Jan 21;: Authors: Tofan D, Sakazaki Y, Walz Mitra K, Peng R, Lee S, Li M, Velian A Abstract Herein we introduce a facile, solution-phase protocol to modify the Lewis basic surface of few-layer black phosphorus (<italic>b</italic>P) and demonstrate its effectiveness at providing ambient stability and tuning of electronic properties. Commercially available group 13 Lewis acids that range in electrophilicity, steric bulk, and Pearson hard/soft-ness are evaluated. The nature of the interaction between the Lewis acids and the <italic>b</italic>P lattice is investigated using a range of microscopic (optical, atomic force, scanning electron) and spectroscopic (energy dispersive, X-ray photoelectron) methods. Al and Ga halides are most effective at preventing ambient degradation of <italic>b</italic>P (&gt;84 h for AlBr3), and the resulting field-effect transistors show excellent <italic>IV</italic> characteristics, photocurrent, and current stability, and are significantly p-doped. This protocol, chemically matched to <italic>b</italic>P and compatible with device fabrication, opens a path for deterministic and persistent tuning of the electronic properties in <italic>b</italic>P. PMID: 33480169 [PubMed - as supplied b...
Source: Angewandte Chemie - Category: Chemistry Authors: Tags: Angew Chem Int Ed Engl Source Type: research