nz0c00603_si_001.pdf (2.45 MB)
Stable CdTe Photoanodes with Energetics Matching Those of a Coating Intermediate Band
journal contribution
posted on 2020-05-19, 18:12 authored by Xiangyan Chen, Xin Shen, Shaohua Shen, Matthew O. Reese, Shu HuA TiO2 coating was grown on a CdTe absorber by atomic
layer deposition for stabilization against its photocorrosion during
photoelectrochemical water splitting. Under simulated sunlight (AM
1.5G, 100 mW cm–2), this multilayer CdS/CdTe/TiO2/Ni/NiOx photoanode produced a
light-limited photocurrent density of 24.5 ± 0.5 mA cm–2 and a photovoltage of 780 ± 20 mV. This record energy-conversion
performance was comparable to those of baseline CdS/CdTe solar cells
and was achieved only after the development of proper CdTe surface
treatments prior to coating the stabilization layer. The TiO2 coating, with its in-gap charge-transport intermediate band, facilitates
hole transport as light exits the CdTe/TiO2 interface.
With proper interfacial chemistry, the electrochemical potential energy
of the coating intermediate band matched that of the CdTe valence
band. Moreover, the stabilized CdS/CdTe/TiO2/Ni/NiOx photoanodes showed 100 h stability for water
oxidation under light-on/light-off cycles. This study provides insightful
guidance for designing stabilization contacts for efficient and stable
light-driven water oxidation.
History
Usage metrics
Categories
Keywords
CdTe valence bandstabilization contactsrecord energy-conversion performancelayer depositionwater oxidationlight-driven water oxidationlight-limited photocurrent density100 h stabilityStable CdTe Photoanodeslight exitsphotoelectrochemical water splittingAM 1.5 GNicmCoating Intermediate BandTiO 2 coatingstabilization layerhole transportCdTe surface treatmentsCdTe absorberphotoanodeCdSin-gap charge-transport
Licence
Exports
RefWorks
BibTeX
Ref. manager
Endnote
DataCite
NLM
DC