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Two-Dimensional Copper Iodide-Based Inorganic–Organic Hybrid Semiconductors: Synthesis, Structures, and Optical and Transport Properties

Journal Article · · Chemistry of Materials
 [1];  [2];  [2];  [3];  [4];  [2];  [2];  [2];  [2];  [2]
  1. Rutgers Univ., Piscataway, NJ (United States); Stockton Univ., Galloway, NJ (United States)
  2. Rutgers Univ., Piscataway, NJ (United States)
  3. Rutgers Univ., Piscataway, NJ (United States), Shenzhen Polytechnic (China)
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
+ Show Author Affiliations
A group of copper iodide-based hybrid semiconductors with the general formula of 2D-CuI(L)0.5 (L = organic ligands) are synthesized and structurally characterized. All compounds are two-dimensional (2D) networks made of one-dimensional (1D) copper iodide staircase chains that are interconnected by bidentate nitrogen-containing ligands. Results from optical absorption and emission experiments and density functional theory (DFT) calculations reveal that their photoluminescence (PL) can be systematically tuned by adjusting the lowest unoccupied molecular orbital (LUMO) energies of the organic ligands. Charge carrier transport measurements were carried out for the first time on single crystals of selected 2D-CuI(L)0.5 structures, and the results show that they possess p-type conductivity with a Hall mobility of ~1 cm2 V-1 s-1 for 2D-CuI(pm)0.5 and 0.13 cm2 V-1 s-1 for 2D-CuI(pz)0.5, respectively. These values are comparable to or higher than the mobilities of typical highly luminescent organic semiconductors. Finally, this work suggests that robust, high-dimensional copper iodide hybrid semiconductors are promising candidates to be considered as a new type of emissive layer for light-emitting diode (LED) devices.
Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division
Grant/Contract Number:
AC02-05CH11231; SC0019902
OSTI ID:
1838433
Journal Information:
Chemistry of Materials, Journal Name: Chemistry of Materials Journal Issue: 13 Vol. 33; ISSN 0897-4756
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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36 MATERIALS SCIENCE
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