Structural Tunability and Diversity of Two‐Dimensional Lead Halide Benzenethiolate
Abstract
Two‐dimensional (2D) organic‐inorganic hybrid materials are currently of great interest for applications in electronics and optoelectronics. Here, the synthesis and optical properties of a new type of halide‐organothiolate‐mixed 2D hybrid material, Pb2X(S‐C6H5)3, are reported, in which X is a halide (I, Br, or Cl). Different from conventional lead‐based 2D layered materials, these compounds feature unusual five‐coordinated lead centers with a stereochemically active electron lone pair on the lead atoms and four‐coordinated iodine atoms. The Pb2X(S‐C6H5)3 materials feature an indirect bandgap, strongly emissive long‐lived self‐trap states, and an extremely large Stokes shift. Interestingly, the optical bandgap of the materials can be tuned through variation of the halides; however, the photoluminescence is less sensitive to the composition and is more likely dominated by lead‐sulfur lattice interactions or the lead lone‐pair electrons. Our results support that a halide–organothiolate mixed anion hybrid structure offers a unique platform for discovering new exciting 2D electronic materials.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Mar 19, 2020
- Source ID
- 10.1002/chem.201905790
Entities
People
- Aidan H. Coffey
- Akriti
- Dong Hee Kim
- Letian Dou
- Libai Huang
- Matthias Zeller
- Peilin Liao
- Pilsun Yoo
- Sona Avetian
Organizations
- National Science Foundation
- Office of Naval Research
- Purdue University
- United States Department of Energy