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dc.contributor.authorWang, Hsin Ping
dc.contributor.authorSun, Ke
dc.contributor.authorNoh, Sun Young
dc.contributor.authorKargar, Alireza
dc.contributor.authorTsai, Meng-Lin
dc.contributor.authorHuang, Ming Yi
dc.contributor.authorWang, Deli
dc.contributor.authorHe, Jr-Hau
dc.date.accessioned2015-08-03T12:35:00Z
dc.date.available2015-08-03T12:35:00Z
dc.date.issued2015-04-06
dc.identifier.issn15306984
dc.identifier.doi10.1021/nl5041463
dc.identifier.urihttp://hdl.handle.net/10754/564171
dc.description.abstractAmorphous Si (a-Si)/crystalline Si (c-Si) heterojunction (SiHJ) can serve as highly efficient and robust photoelectrodes for solar fuel generation. Low carrier recombination in the photoelectrodes leads to high photocurrents and photovoltages. The SiHJ was designed and fabricated into both photoanode and photocathode with high oxygen and hydrogen evolution efficiency, respectively, by simply coating of a thin layer of catalytic materials. The SiHJ photoanode with sol-gel NiOx as the catalyst shows a current density of 21.48 mA/cm2 at the equilibrium water oxidation potential. The SiHJ photocathode with 2 nm sputter-coated Pt catalyst displays excellent hydrogen evolution performance with an onset potential of 0.640 V and a solar to hydrogen conversion efficiency of 13.26%, which is the highest ever reported for Si-based photocathodes. © 2015 American Chemical Society.
dc.description.sponsorshipD.W. acknowledges the financial support for this work by the National Science Foundation (CBET1236155). D.W. thanks Drs. R. Rao and B. Fruhberger from Qualcomm Institute of UCSD for their unconditional support. The authors thank the staff of UCSD Nano3 facilities for their timely and professional support. The authors acknowledge KAUST, National Science Council of Taiwan and National Taiwan University.
dc.publisherAmerican Chemical Society (ACS)
dc.subjecthydrogen evolution
dc.subjectoxygen evolution
dc.subjectSi heterojunction photoelectrodes
dc.subjectsolar to hydrogen conversion efficiency
dc.subjectsolar to oxygen conversion efficiency
dc.titleHigh-performance a -Si/c-Si heterojunction photoelectrodes for photoelectrochemical oxygen and hydrogen evolution
dc.typeArticle
dc.contributor.departmentComputer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
dc.contributor.departmentElectrical Engineering Program
dc.contributor.departmentKAUST Solar Center (KSC)
dc.contributor.departmentNano Energy Lab
dc.identifier.journalNano Letters
dc.contributor.institutionDepartment of Electrical and Computer Engineering, University of California-San Diego, 9500 Gilman DriveSan Diego, CA, United States
dc.contributor.institutionAdvanced Technology Department, AU Optronic CorporationTaichung, Taiwan
dc.contributor.institutionMaterials Science and Engineering Program, University of California-San Diego, 9500 Gilman DriveSan Diego, CA, United States
dc.contributor.institutionQualcomm Institute, University of California-San Diego, 9500 Gilman DriveSan Diego, CA, United States
dc.contributor.institutionInstitute of Photonics and Optoelectronics, Department of Electrical Engineering, National Taiwan UniversityTaipei, Taiwan
kaust.personHe, Jr-Hau
kaust.personWang, Hsin Ping
kaust.personTsai, Meng-Lin
dc.date.published-online2015-04-06
dc.date.published-print2015-05-13


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