Proton Transfer‐Driven Modification of 3D Hybrid Perovskites to Form Oriented 2D Ruddlesden–Popper Phases
Zonghui Duan,
Guangren Na,
Shixun Wang,
Jiajia Ning,
Bangyu Xing,
Fei Huang,
Arsenii S. Portniagin,
Stephen V. Kershaw,
Lijun Zhang,
Andrey L. Rogach
Affiliations
Zonghui Duan
Department of Materials Science and Engineering Centre for Functional Photonics (CFP) City University of Hong Kong Hong Kong SAR 999077 P. R. China
Guangren Na
State Key Laboratory of Superhard Materials Key Laboratory of Automobile Materials of MOE College of Materials Science and Engineering Jilin University Changchun 130012 P. R. China
Shixun Wang
Department of Materials Science and Engineering Centre for Functional Photonics (CFP) City University of Hong Kong Hong Kong SAR 999077 P. R. China
Jiajia Ning
Department of Materials Science and Engineering Centre for Functional Photonics (CFP) City University of Hong Kong Hong Kong SAR 999077 P. R. China
Bangyu Xing
State Key Laboratory of Superhard Materials Key Laboratory of Automobile Materials of MOE College of Materials Science and Engineering Jilin University Changchun 130012 P. R. China
Fei Huang
Institute for Advanced Materials and Technology University of Science and Technology Beijing Beijing 100083 P. R. China
Arsenii S. Portniagin
Department of Materials Science and Engineering Centre for Functional Photonics (CFP) City University of Hong Kong Hong Kong SAR 999077 P. R. China
Stephen V. Kershaw
Department of Materials Science and Engineering Centre for Functional Photonics (CFP) City University of Hong Kong Hong Kong SAR 999077 P. R. China
Lijun Zhang
State Key Laboratory of Superhard Materials Key Laboratory of Automobile Materials of MOE College of Materials Science and Engineering Jilin University Changchun 130012 P. R. China
Andrey L. Rogach
Department of Materials Science and Engineering Centre for Functional Photonics (CFP) City University of Hong Kong Hong Kong SAR 999077 P. R. China
Herein, it is shown how a proton transfer process between the organic moiety in 3D methylammonium lead halide perovskite and the introduced aliphatic alkylamines provides the basis for a fabrication route toward hybrid 3D/2D perovskites and finally purely 2D Ruddlesden–Popper (RP) perovskite phases, predominantly the n = 1 phase. Five alkylamines with varying aliphatic chain lengths, such as butylamine, octylamine, dodecylamine, hexadecylamine, and octadecylamine as antisolvents in toluene, are used, which quickly protonate during the spin‐coating deposition of thin perovskite films. Formation of hydrogen bonds between protonated alkylamines and lead halide slabs leads to mixed 3D/2D hybrid perovskites, where the ratio between the 3D and 2D phases can be adjusted by the concentration of the alkylamine containing antisolvents. Longer‐chain aliphatic alkylamines (12 carbon atoms or greater) are most prone to slice 3D perovskite into layered perovskites with efficient green emission reaching up to 38% for their photoluminescence quantum yield in films. Above a certain concentration threshold, 3D perovskite can be completely modified into 2D RP perovskite phases with crystalline orientation parallel to the substrate. The introduced facile perovskite phase modification approach provides a convenient way toward different kinds of 2D RP metal halide perovskite films with attractive optical properties.
