Tantalum Nitride Electron-Selective Contact for Crystalline Silicon Solar Cells
Hedhili, Mohamed N.
De Wolf, Stefaan
KAUST DepartmentPhysical Sciences and Engineering (PSE) Division
Materials Science and Engineering Program
KAUST Catalysis Center (KCC)
KAUST Solar Center (KSC)
KAUST Solar Center; King Abdullah University of Science and Technology (KAUST); Thuwal 23955-6900 Saudi Arabia
KAUST Core Lab; King Abdullah University of Science and Technology (KAUST); Thuwal 23955-6900 Saudi Arabia
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AbstractMinimizing carrier recombination at contact regions by using carrier‐selective contact materials, instead of heavily doping the silicon, has attracted considerable attention for high‐efficiency, low‐cost crystalline silicon (c‐Si) solar cells. A novel electron‐selective, passivating contact for c‐Si solar cells is presented. Tantalum nitride (TaN x ) thin films deposited by atomic layer deposition are demonstrated to provide excellent electron‐transporting and hole‐blocking properties to the silicon surface, due to their small conduction band offset and large valence band offset. Thin TaNx interlayers provide moderate passivation of the silicon surfaces while simultaneously allowing a low contact resistivity to n‐type silicon. A power conversion efficiency (PCE) of over 20% is demonstrated with c‐Si solar cells featuring a simple full‐area electron‐selective TaNx contact, which significantly improves the fill factor and the open circuit voltage (Voc) and hence provides the higher PCE. The work opens up the possibility of using metal nitrides, instead of metal oxides, as carrier‐selective contacts or electron transport layers for photovoltaic devices.
CitationYang X, Aydin E, Xu H, Kang J, Hedhili M, et al. (2018) Tantalum Nitride Electron-Selective Contact for Crystalline Silicon Solar Cells. Advanced Energy Materials: 1800608. Available: http://dx.doi.org/10.1002/aenm.201800608.
SponsorsThe work presented in this publication was supported by King Abdullah University of Science and Technology (KAUST), through the Competitive Research Grant. Research performed at the Australian National University was supported by the Australian Government through the Australian Research Council (Discovery Project: DP150104331).
JournalAdvanced Energy Materials