Thermoelectric devices enable direct conversion between thermal and electrical energy.Recent studies have indicated that the thin film/substrate heterostructure is effective in achieving high thermoelectric performance via decoupling the Seebeck coefficient and electrical conductivity otherwise adversely inter-dependent in homogenous bulk materials.However,the mechanism underlying the thin film/sub-strate heterostructure thermoelectricity remains unclear.In addition,the power output of the thin film/-substrate heterostructure is limited to the nanowatt scale to date,falling short of the practical application requirement.Here,we fabricated the CrN/SrTiO3-x heterostructures with high thermoelectric output power and outstanding thermal stability.By varying the CrN film thickness and the reduction degree of SrTiO3-x substrate,the optimized power output and the power density have respectively reached 276 μW and 108 mW/cm2 for the 30 nm CrN film on a highly reduced surface of SrTiO3-x under a tem-perature difference of 300 K.The performance enhancement is attributed to the CrN/SrTiO3-x heteroin-terface,corroborated by the band bending as revealed by the scanning Kelvin probe microscopy.These results will stimulate further research efforts towards interface thermoelectrics.

Xueying Wan;Xiaowei Lu;Lin Sun;Mingyu Chen;Na Ta;Wei Liu;Qi Chen;Liwei Chen;Jian He;Peng Jiang;Xinhe Bao

State Key Laboratory of Catalysis,CAS Center for Excellence in Nanoscience,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023,Liaoning,China;University of Chinese Academy of Sciences,Beijing 100049,China;Dalian National Laboratory for Clean Energy,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023,Liaoning,China;i-Lab,Suzhou Institute of Nano-Tech and Nano-Bionics,Chinese Academy of Sciences,Suzhou 215123,Jiangsu,China;Department of Physics and Astronomy,Clemson University,Clemson 29634-0978,USA

能源化学

[1]Xueying Wan;Xiaowei Lu;Lin Sun;Mingyu Chen;Na Ta;Wei Liu;Qi Chen;Liwei Chen;Jian He;Peng Jiang;Xinhe Bao-.Interface-enhanced thermoelectric output power in CrN/SrTiO3-x heterostructure)[J].能源化学,2022(01):16-22

nanowatt,heteroin

Interface,enhanced,output,power,CrN,SrTiO3,Thermoelectric,devices,enable,direct,conversion,between,thermal,electrical,energy,Recent,studies,have,indicated,that,thin,film,substrate,effective,achieving,performance,via,decoupling,Seebeck,coefficient,conductivity,otherwise,adversely,dependent,homogenous,bulk,materials,However,mechanism,underlying,thermoelectricity,remains,unclear,addition,limited,scale,date,falling,short,practical,application,requirement,Here,fabricated,heterostructures,outstanding,stability,By,varying,thickness,reduction,degree,optimized,density,respectively,reached,mW,highly,reduced,surface,tem,perature,difference,enhancement,attributed,corroborated,by,band,bending,as,revealed,scanning,Kelvin,probe,microscopy,These,results,will,stimulate,further,research,efforts,towards,interface,thermoelectrics

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