Enhancing Water-Splitting Efficiency Using a Zn/Sn-Doped PN Photoelectrode of Pseudocubic α-Fe2O3 Nanoparticles

Jie Xiang Yang, Yongtao Meng, Chuan Ming Tseng, Yan Kai Huang, Tung Ming Lin, Yang Ming Wang, Jin Pei Deng, Hsiang Chiu Wu, Wei Hsuan Hung

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

α-Phase hematite photoelectrodes can split water. This material is nontoxic, inexpensive, and chemically stable; its low energy gap of 2.3 eV absorbs light with wavelengths lower than 550 nm, accounting for approximately 30% of solar energy. Previously, we reported polyhedral pseudocubic α-Fe2O3 nanocrystals using a facile hydrothermal route to increase spatial charge separation, enhancing the photocurrent of photocatalytic activity in the water-splitting process. Here, we propose a p-n junction structure in the photoanode of pseudocubic α-Fe2O3 to improve short carrier diffusion length, which limits its photocatalytic efficiency. We dope Zn on top of an Fe2O3 photoanode to form a layer of p-type semiconductor material; Sn is doped from the FTO substrate to form a layer of n-type semiconductor material. The p-n junction, n-type Fe2O3:Sn and p-type Fe2O3:Zn, increase light absorption and charge separation caused by the internal electric field in the p-n junction.

Original languageEnglish
Article number130
JournalNanoscale Research Letters
Volume15
Issue number1
DOIs
StatePublished - 2020

Keywords

  • Pseudocubic α-FeO
  • Solar energy
  • Water splitting
  • p-n junction

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