Robust and Highly Conductive Water-Stable Copper Iodide-Based Hybrid Single Crystals

Yang Fang, Kun Zhu, Simon Teat, Obadiah Reid, Ziuze Hei, Kai Zhu, Xiaochen Fang, Mingxing Li, Christopher Sojdak, Mircea Cotlet, Jing Li

Research output: Contribution to journalArticlepeer-review

7 Scopus Citations


High conductivity, carrier mobility as well as long diffusion length are critical for highly efficient solar cells. Here, we report new types of crystalline inorganic-organic hybrid semiconductors, 2D-Cu2I2(L) [L = benzo[c][1,2,5]thiadiazole (bs) and benzo[c][1,2,5] selenadiazole (bse)], composed of one-dimensional (1D) copper iodide staircase-like chain and benzodiazole-based ligands. These compounds possess narrow and tunable band gaps and high conductivity. High-quality large single crystals of 2D-Cu2I2(bse) were grown and used to evaluate the charge transport properties of the material. State-of-the-art time-resolved microwave conductivity (TRMC) techniques were used to investigate the charge carrier dynamics, from which a high conductivity of 2 × 10-4S/cm, a carrier mobility of ∼1 cm2V-1s-1, a maximum doping/carrier density of 2 ± 1 × 1015cm-3, and a diffusion length of ∼0.17 μm were obtained. The excellent water/chemical stability combined with high conductivity makes this I-VII-based hybrid material family promising candidates for potential optoelectronic applications.

Original languageAmerican English
Pages (from-to)10040-10049
Number of pages10
JournalChemistry of Materials
Issue number22
StatePublished - 2022

Bibliographical note

Publisher Copyright:
© 2022 American Chemical Society. All rights reserved.

NREL Publication Number

  • NREL/JA-5900-84780


  • charge transport properties
  • hybrid semiconductors
  • optoelectronics
  • solar cells


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