Engineering Surface Architectures for Improved Durability in III-V Photocathodes

Micha Ben-Naim, Chase Aldridge, Myles Steiner, Reuben Britto, Adam Nielander, Laurie King, Todd Deutsch, James Young, Thomas Jaramillo

Research output: Contribution to journalArticlepeer-review

8 Scopus Citations


GaInP2 has shown promise as the wide bandgap top junction in tandem absorber photoelectrochemical (PEC) water splitting devices. Among previously reported dual-junction PEC devices with a GaInP2 top cell, those with the highest performance incorporate an AlInP2 window layer (WL) to reduce surface recombination and a thin GaInP2 capping layer (CL) to protect the WL from corrosion in electrolytes. However, the stability of these III–V systems is limited, and durability continues to be a major challenge broadly in the field of PEC water splitting. This work provides a systematic investigation into the durability of GaInP2 systems, examining the impacts of the window layer and capping layer among single junction pn-GaInP2 photocathodes coated with an MoS2 catalytic and protective layer. The photocathode with both a CL and WL demonstrates the highest PEC performance and longest lifetime, producing a significant current for >125 h. In situ optical imaging and post-test characterization illustrate the progression of macroscopic degradation and chemical state. The surface architecture combining an MoS2 catalyst, CL, and WL can be translated to dual-junction PEC devices with GaInP2 or other III–V top junctions to enable more efficient and stable PEC systems.

Original languageAmerican English
Pages (from-to)20385-20392
Number of pages8
JournalACS Applied Materials and Interfaces
Issue number18
StatePublished - 2022

Bibliographical note

Publisher Copyright:
© 2022 American Chemical Society

NREL Publication Number

  • NREL/JA-5900-79642


  • GaInP
  • III−V
  • photoelectrochemistry
  • protective layers
  • water splitting


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