Description of field of research:

Inorganic lead halide perovskite nanocrystals (NCs) regarded as the most promising and intriguing semiconductor has attracted tremendous attention for their application in optoelectronic devices. However, the proverbial toxicity of lead and the intrinsic instability toward moisture hinder the mass production and commercialization of these lead halide perovskite NCs. Therefore, the quest for alternative non-toxic and stable semiconductor materials that preserve the superior optoelectronic properties of lead-based perovskite NCs has become a progressively more crucial research topic in the research community. In addition, the most of reported synthesis methods (Hot-injection) for lead-free perovskite NCs employ hydrophobic long-chain ligands (oleic acid or oleylamine) for the size control, surface passivation, and colloidal stabilization. However, these long chain surface ligands often act as insulating layers, thus limiting their performance in optoelectronic devices. This further demand the need of alternative room temperature synthesis processes, especially those conducted in air ambient, offer a far more economically viable proposition. This ToR project will be focused on the synthesis of lead-free perovskite NCs (For ex. Cs3Cu2X5, Cs3Bi2X9 (X = I, Br, Cl)) using ligand assisted reprecipitation (LARP) method at room temperature and study their optoelectronic properties.

Research Area

Sustainable Energy/Materials

This research will be undertaken within the New PV Materials Research Group led by Scientia A/Prof. Xiaojing Hao. This group consists of a range of academics, postdocs, and PhD students, offering a multidisciplinary research environment to the student to learn various skills necessary to foster their future career in academic or industry.

The student is expected to 1) gain experience in nanocrystals synthesis and understand the synthesis mechanism 2) obtain hands-on experience in optoelectronic characterizations. If successful, we anticipate the student contributing to academic publication. In addition, continuing of the research as a 4th year honour thesis project is feasible.

  1. Q. Fan, G. V. Biesold-McGee, J. Ma, Q. Xu, S. Pan, J. Peng, Z. Lin, Lead Free Halide Perovskite Nanocrystals: Crystal Structures, Synthesis, Stabilities, and Optical Properties, Angew.Chem.Int. Ed. 2020, 59,1030 1046
  2. Y. Tang, L. Gomez, M. van der Laan, D. Timmerman, V. Sebastian, C.-C. Huang, T. Gregorkiewicz P. Schall, Room Temperature Synthesis and Characterization of Novel Lead-Free Double Perovskite Nanocrystals with a Stable and Broadband Emission, J. Mater. Chem. C, 2021, 9, 158-163