4.7 Article

Layer-By-Layer Polyelectrolyte Assembly for the Protection of GaP Surfaces from Photocorrosion

期刊

ACS APPLIED NANO MATERIALS
卷 4, 期 1, 页码 425-431

出版社

AMER CHEMICAL SOC
DOI: 10.1021/acsanm.0c02768

关键词

polyelectrolytes; layer-by-layer assembly; proton sponge; III-V semiconductors; photocorrosion

资金

  1. RSF [19-19-00508]
  2. German Federal Ministry of Education and Research (BMBF) [033RC021A]
  3. German Research Foundation (DFG) [PAK 981/3]
  4. Russian Science Foundation [19-19-00508] Funding Source: Russian Science Foundation

向作者/读者索取更多资源

Polyelectrolyte layer-by-layer assemblies are effective in mitigating photocorrosion on GaP photocathode surfaces without reducing photoconversion efficiency. The activity of these assemblies is based on buffering pH changes and impeding dissolution kinetics at the solid-liquid interface. The protective coatings showed promising results in preventing corrosion and maintaining photoconversion efficiencies.
Polyelectrolyte layer-by-layer assemblies are known as protective coatings for corrosion inhibition. Here, we demonstrate that polyelectrolyte multilayers of poly-(ethyleneimine) (PEI) and poly(styrene sulfonate) (PSS)-(PEI/PSS)(x)-adsorbed at the GaP(100) photocathode surface remarkably mitigate the photocorrosion of GaP without decreasing its photoconversion efficiency. The activity of the polybase-polyacid complex is based on buffering pH changes at the solid-liquid interface. We carried out ab initio molecular dynamics-based simulations of the GaP(100) surface in contact with liquid water and demonstrated that an increase in the proton concentration enhances GaP dissolution. We used the scanning vibrating electrode technique (SVET) to characterize the distribution of photocorrosion activity areas over bare and polyelectrolyte- coated GaP surfaces and we showed that a polyelectrolyte coating impedes the dissolution kinetics. Data obtained using the SVET were compared to photoetched pores on the semiconductor surface. Voltammetric and chronoamperometric measurements were also performed to evaluate photoconversion efficiencies before and after the application of the protective coatings.

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