Stable CdTe Photoanodes with Energetics Matching Those of a Coating Intermediate Band

Xiangyan Chen; Xiangyan Chen; Xiangyan Chen; Xin Shen; Xin Shen; Shaohua Shen; Matthew O. Reese; Shu Hu; Shu Hu

doi:10.1021/acsenergylett.0c00603

Stable CdTe Photoanodes with Energetics Matching Those of a Coating Intermediate Band

Xiangyan Chen
, Xiangyan Chen
, Xiangyan Chen
, Xin Shen
, Xin Shen
, Shaohua Shen
, Matthew O. Reese
, Shu Hu
, Shu Hu

School of Energy and Power Engineering

Research output: Contribution to journal › Article › peer-review

25 Scopus citations

Abstract

A 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.

Original language	English
Pages (from-to)	1865-1871
Number of pages	7
Journal	ACS Energy Letters
Volume	5
Issue number	6
DOIs	https://doi.org/10.1021/acsenergylett.0c00603
State	Published - 12 Jun 2020

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title = "Stable CdTe Photoanodes with Energetics Matching Those of a Coating Intermediate Band",

abstract = "A 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.",

author = "Xiangyan Chen and Xiangyan Chen and Xiangyan Chen and Xin Shen and Xin Shen and Shaohua Shen and Reese, \{Matthew O.\} and Shu Hu and Shu Hu",

note = "Publisher Copyright: Copyright {\textcopyright} 2020 American Chemical Society.",

year = "2020",

month = jun,

day = "12",

doi = "10.1021/acsenergylett.0c00603",

language = "英语",

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T1 - Stable CdTe Photoanodes with Energetics Matching Those of a Coating Intermediate Band

AU - Chen, Xiangyan

AU - Shen, Xin

AU - Shen, Shaohua

AU - Reese, Matthew O.

AU - Hu, Shu

PY - 2020/6/12

Y1 - 2020/6/12

N2 - A 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.

AB - A 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.

UR - https://www.scopus.com/pages/publications/85087198761

U2 - 10.1021/acsenergylett.0c00603

DO - 10.1021/acsenergylett.0c00603

M3 - 文章

AN - SCOPUS:85087198761

SN - 2380-8195

VL - 5

SP - 1865

EP - 1871

JO - ACS Energy Letters

JF - ACS Energy Letters

IS - 6

ER -

Stable CdTe Photoanodes with Energetics Matching Those of a Coating Intermediate Band

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