Creation of 3D Textured Graphene/Si Schottky Junction Photocathode for Enhanced Photo-Electrochemical Efficiency and Stability

Che Kuei Ku, Po Hsien Wu, Cheng Chu Chung, Chun Chi Chen, Kai Jie Tsai, Hung Ming Chen, Yu Cheng Chang, Cheng Hao Chuang, Chuan Yu Wei, Cheng Yen Wen, Tzu Yao Lin, Hsuen Li Chen, Yen Shang Wang, Zhe Yu Lee, Jun Ru Chang, Chih Wei Luo, Di Yan Wang*, Bing Joe Hwang, Chun Wei Chen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

This work presents a novel photo-electrochemical architecture based on the 3D pyramid-like graphene/p-Si Schottky junctions. Overcoming the conventional transfer technique by which only planar graphene/Si Schottky junctions are currently available, this work demonstrates the 3D pyramid-like graphene/p-Si Schottky junction photocathode, which greatly enhances light harvesting efficiency and exhibits promising photo-electrochemical performance for hydrogen generation. The formation of 3D pyramid-like graphene/p-Si Schottky junctions exhibits enhanced electrochemical activity and promotes charge separation efficiency compared with the bare pyramid Si surface without graphene. The inherent chemical inertness of graphene significantly improves the operational stability of 3D graphene/p-Si Schottky junction photo-electrochemical cells. The 3D pyramid-like graphene/p-Si Schottky junction photocathode delivers an onset potential of 0.41 V and a saturated photocurrent density of −32.5 mA cm−2 at 0 V (vs RHE) with excellent stability comparable to values reported for textured or nanostructured p-Si photocathodes coated with ultrathin oxide layers by the conventional atomic layer deposition technique. These results suggest that the formation of graphene/Si Schottky junctions with a 3D architecture is a promising approach to improve the performance and durability of Si-based photo-electrochemical systems for water splitting or solar-to-fuel conversion.

Original languageEnglish
Article number1901022
JournalAdvanced Energy Materials
Volume9
Issue number29
DOIs
StatePublished - 1 Jan 2019

Keywords

  • graphene
  • graphene/p-Si Schottky junction
  • photo-electrochemical cell
  • pyramid Si
  • water splitting

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