Near-Infrared Organic-Inorganic Copper Halide Film with Spectral Response over 1400 nm for Photodetector Application

Xitao Li, Xiyao Chen, Huihui Pi, Lingling Xie, Zhe Liu, Ning Lv, Fanqing Zhang, Jing Zhao*, Bingkun Chen*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Organic-inorganic metal halides (OIMHs) have emerged as promising light absorbers for photodetector applications, especially Cu-based OIMHs. Herein, a novel Cu-based OIMH named (BA)4CuII(CuIInIII)0.5Cl8 has been synthesized by an ethanol assisted stirring method as powders, and a film sample has further been fabricated by a one step spin-coating method. (BA)4CuII(CuIInIII)0.5Cl8 exhibits a broadband absorption spectrum, peaking at 375, 620, as well as 875 nm, and a cutoff wavelength up to 1400 nm. In particular, a simple photoconductive photodetector based on the (BA)4CuII(CuIInIII)0.5Cl8 film as an absorber is first realized. The responsivity (R) and detectivity (D*) are as high as 2.6 × 10-5 A/W and 7 × 108 Jones at 980 nm, respectively. The measured linear dynamic range (LDR) is calculated to be 29 dB. Besides, a flexible photodetector with a polyvinyl chloride (PVC) substrate has been fabricated with a bending angle exceeding 90°, and the device can still work stably even after 80 bending cycles. This work provides a novel strategy to realize the high absorption of metal halides in the NIR region and highlights its potential in detection and imaging applications.

Original languageEnglish
Pages (from-to)9103-9112
Number of pages10
JournalACS Applied Electronic Materials
Volume6
Issue number12
DOIs
Publication statusPublished - 24 Dec 2024

Keywords

  • Broadband absorption
  • Lead-free
  • Near-infrared
  • Organic−inorganic copper halide
  • Photoconductive photodetector

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Li, X., Chen, X., Pi, H., Xie, L., Liu, Z., Lv, N., Zhang, F., Zhao, J., & Chen, B. (2024). Near-Infrared Organic-Inorganic Copper Halide Film with Spectral Response over 1400 nm for Photodetector Application. ACS Applied Electronic Materials, 6(12), 9103-9112. https://doi.org/10.1021/acsaelm.4c01744