Tailoring Photoelectrochemical Performance and Stability of Cu(In,Ga)Se-2 Photocathode via TiO2-Coupled Buffer Layers

Cited 11 time in webofscience Cited 0 time in scopus
  • Hit : 340
  • Download : 0
We report on the photoelectrochemical (PEC) performance and stability of Cu(In,Ga)Se-2 (CIGS)-based photocathodes for photocatalytic hydrogen evolution from water. Various functional overlayers, such as CdS, TiO2, ZnxSnyOz, and a combination of the aforementioned, were applied on the CIGS to improve the performance and stability. We identified that the insertion of TiO2 overlayer on p-CIGS/n-buffer layers significantly improves the PEC performance. A multilayered photocathode consisting of CIGS/CdS/TiO2/Pt exhibited the best current-potential characteristics among the tested photocathodes, which demonstrates a power-saved efficiency of 2.63%. However, repeated linear sweep voltammetry resulted in degradation of performance. In this regard, we focused on the PEC durability issues through in-depth chemical characterization that revealed the degradation was attributed to atomic redistribution of elements constituting the photocathode, namely, in-diffusion of Pt catalysts, out-diffusion of elements from the CIGS, and removal of the metal-oxide layers; the best-performing CIGS/CdS/TiO2/Pt photocathode retained its initial performance until the TiO2 overlayer was removed. It was also found that the durability of CIGS photocathodes with a TiO2-coated metal-oxide buffer layer such as ZnxSnyOz was better than those with a TiO2-coated CdS, and the degradation mechanism was different, suggesting that the stability of a CIGS-based photocathode can be improved by careful design of the structure.
Publisher
AMER CHEMICAL SOC
Issue Date
2017-02
Language
English
Article Type
Article
Keywords

SOLAR HYDROGEN-PRODUCTION; THIN-FILMS; WATER REDUCTION; CELLS; EVOLUTION; CIGS; CDS; TIO2; SI; PHOTOANODES

Citation

ACS APPLIED MATERIALS & INTERFACES, v.9, no.6, pp.5279 - 5287

ISSN
1944-8244
DOI
10.1021/acsami.6b15168
URI
http://hdl.handle.net/10203/223290
Appears in Collection
EEW-Journal Papers(저널논문)MS-Journal Papers(저널논문)
Files in This Item
There are no files associated with this item.
This item is cited by other documents in WoS
⊙ Detail Information in WoSⓡ Click to see webofscience_button
⊙ Cited 11 items in WoS Click to see citing articles in records_button

qr_code

  • mendeley

    citeulike


rss_1.0 rss_2.0 atom_1.0