Enhanced Performance of a Monolayer MoS2/WSe2 Heterojunction as a Photoelectrochemical Cathode

Jingwei Xiao; Yu Zhang; Huanjun Chen; Ningsheng Xu; Shaozhi Deng

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Enhanced Performance of a Monolayer MoS2/WSe2 Heterojunction as a Photoelectrochemical Cathode

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Transition-metal dichalcogenide（TMD） semiconductors have attracted interest as photoelectrochemical（PEC） electrodes due to their novel band-gap structures,optoelectronic properties, and photocatalytic activities.However, the photo-harvesting efficiency still requires improvement. In this study, A TMD stacked heterojunction structure was adopted to further enhance the performance of the PEC cathode. A P-type WSe2 and an N-type Mo S2 monolayer were stacked layer-by-layer to build a ultrathin vertical heterojunction using a micro-fabrication method.In situ measurement was employed to characterize the intrinsic PEC performance on a single-sheet heterostructure.Benefitting from its built-in electric field and type II band alignment, the MoS2/WSe2 bilayer heterojunction exhibited exceptional photocatalytic activity and a high incident photo-to-current conversion efficiency（IPCE）. Comparing with the monolayer WSe2 cathode, the PEC current and the IPCE of the bilayer heterojunction increased by a factor of 5.6 and enhanced 50%, respectively. The intriguing performance renders the MoS2/WSe2 heterojunction attractive for application in high-performance PEC water splitting.

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《纳微快报：英文版》 |2018年第4期|P.52-60|共9页
作者
Jingwei Xiao; Yu Zhang; Huanjun Chen; Ningsheng Xu; Shaozhi Deng;
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作者单位

State Key Laboratory of Optoelectronic Materials and Technologies;

Guangdong Province Key Laboratory of Display Material and Technology;

School of Electronics and Information Technology;

Sun Yat-sen University;

State Key Laboratory of Optoelectronic Materials and Technologies;

Guangdong Province Key Laboratory of Display Material and Technology;

School of Electronics and Information Technology;

Sun Yat-sen University;

State Key Laboratory of Optoelectronic Materials and Technologies;

Guangdong Province Key Laboratory of Display Material and Technology;

School of Electronics and Information Technology;

Sun Yat-sen University;

State Key Laboratory of Optoelectronic Materials and Technologies;

Guangdong Province Key Laboratory of Display Material and Technology;

School of Electronics and Information Technology;

Sun Yat-sen University;

State Key Laboratory of Optoelectronic Materials and Technologies;

Guangdong Province Key Laboratory of Display Material and Technology;

School of Electronics and Information Technology;

Sun Yat-sen University;

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Enhanced Performance of a Monolayer MoS2/WSe2 Heterojunction as a Photoelectrochemical Cathode

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