Photoelectrochemical Application and Charge Transport Dynamics of a Water-Stable Organic-Inorganic Halide (C6H4NH2CuCl2I) Film in Aqueous Solution

Fan Wu, Rajesh Pathak, Junhong Liu, Ronghua Jian, Tiansheng Zhang, Quinn Qiao

Research output: Contribution to journalArticlepeer-review

Abstract

A water-stable thin film composed of C6H4NH2CuCl2I was fabricated using spin-coating precursor solutions that dissolved equimolar amounts of C6H4NH2I and CuCl2 in N,N-dimethylformamide. Photoelectrochemical characteristics show that the C6H4NH2CuCl2I film demonstrated a stable photocurrent (∼1 μA/cm2) in an aqueous solution under white light (11.5 mW/cm2) even after 3000 s, while exhibiting a photon-to-current efficiency of 0.093% under AM1.5 (100 mW/cm2) illumination. However, these values were significantly lower than those of the CH3NH3PbX3 (X = I, Cl) film in solid devices. The electron diffusion length L(e-) (373 nm) and hole diffusion length L(h+) (177 nm) in the C6H4NH2CuCl2I photoelectrode were significantly lower than those of CH3NH3PbX3, limiting the photoelectrochemical and photocatalysis performances. Moreover, L(h+) was shorter than L(e-) in the C6H4NH2CuCl2I photoelectrode, resulting in the hole-collecting efficiency [νc(h+)] being lower than the electron-collecting efficiency [νc(e-)]. A CuO interlayer was introduced as a hole transport layer for the C6H4NH2CuCl2I photoelectrode, which improved L(h+) and νc(h+).

Original languageEnglish (US)
Pages (from-to)44274-44283
Number of pages10
JournalACS Applied Materials and Interfaces
Volume13
Issue number37
DOIs
StatePublished - Sep 22 2021

Keywords

  • CHNHCuClI
  • charge transport
  • IMPS/IMVS
  • perovskite
  • photocatalysis
  • photoelectrochemical cell

ASJC Scopus subject areas

  • Materials Science(all)

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