Demonstration of a High Open-Circuit Voltage GaN Betavoltaic Microbattery
- 1 July 2011
- journal article
- Published by IOP Publishing in Chinese Physics Letters
- Vol. 28 (7), 078401
- https://doi.org/10.1088/0256-307x/28/7/078401
Abstract
A high open-circuit voltage betavoltaic microbattery based on a GaN p-i-n diode is demonstrated. Under the irradiation of a 4×4 mm2 planar solid 63Ni source with an activity of 2 mCi, the open-circuit voltage Voc of the fabricated single 2×2mm2 cell reaches as high as 1.62 V, the short-circuit current density Jsc is measured to be 16nA/cm2. The microbattery has a fill factor of 55%, and the energy conversion efficiency of beta radiation into electricity reaches to 1.13%. The results suggest that GaN is a highly promising potential candidate for long-life betavoltaic microbatteries used as power supplies for microelectromechanical system devices.Keywords
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