Title :
A betavoltaic microcell based on semiconducting single-walled carbon nanotube arrays/Si heterojunctions
Author :
Li, M.G. ; Zhang, J.
Author_Institution :
Nat. Key Lab. of Micro/ Nanometer Fabrication Technol., Peking Univ., Beijing, China
Abstract :
In this paper, a novel betavoltaic (BV) microcell based on semiconducting single-walled carbon nanotube (s-SWCNT) arrays/Si heterojunctions are demonstrated for the first time. The aligned arrays of p-type s-SWCNTs were prepared on n-type silicon to form the p-n heterojunctions as energy conversion by the traditional micro-fabrication process and dielectrophoretic (DEP) technology. The s-SWCNT arrays/Si p-n heterojunction displays better rectification characteristics than the SWCNT-based Schottky junctions such as Au/s-SWCNT/Ti and SWCNTs thin film/Si in our previous works. Under 7.8mCi/cm2 63Ni irradiation, the open circuit voltage (VOC) of 62mV, short current density (JSC) of 3.8μA/cm2, fill factor (FF) of 33.4% and energy conversion efficiency (η) of 9.8% were achieved. The results indicated that this s-SWCNT arrays/Si microcell has a huge potential for application in BV microcells.
Keywords :
betavoltaic power sources; carbon nanotubes; electrophoresis; elemental semiconductors; p-n heterojunctions; semiconductor nanotubes; silicon; BV microcell; C-Si; DEP; SWCNT-based Schottky junctions; betavoltaic microcell; dielectrophoretic technology; efficiency 9.8 percent; energy conversion; energy conversion efficiency; fill factor; microfabrication process; n-type silicon; open circuit voltage; p-n heterojunctions; p-type s-SWCNTs array; rectification characteristics; semiconducting single-walled carbon nanotube arrays-silicon heterojunctions; short current density; voltage 62 mV; Electrodes; Energy conversion; Gold; Heterojunctions; Microcell networks; Silicon;
Conference_Titel :
Micro Electro Mechanical Systems (MEMS), 2015 28th IEEE International Conference on
Conference_Location :
Estoril
DOI :
10.1109/MEMSYS.2015.7051156
