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Article Dans Une Revue Applied Physics Letters Année : 2020

Ultrahigh conversion efficiency of betavoltaic cell using diamond pn junction

Résumé

A betavoltaic cell, which directly converts beta particles into energy, is composed of a junction diode and a beta-emitting source. Because the cells can deliver electricity over a long operation life ranging from several years to a decade, they are promising devices for applications in remote locations such as outer space, deserts, and underground areas. Herein, we report efficient energy conversion using a diamond pn junction. We characterized the betavoltaic performance under electron-beam irradiation using scanning electron microscopy and observed an open-circuit voltage of 4.26 V, a fill factor of 0.85, and a semiconductor conversion efficiency of 28%. These are the best values reported thus far for betavoltaic cells. The efficiency is close to the theoretical Shockley–Queisser efficiency limit for betavoltaic cells.
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Dates et versions

hal-04094877 , version 1 (17-05-2023)

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T. Shimaoka, H. Umezawa, K. Ichikawa, J. Pernot, S. Koizumi. Ultrahigh conversion efficiency of betavoltaic cell using diamond pn junction. Applied Physics Letters, 2020, 117 (10), pp.103902. ⟨10.1063/5.0020135⟩. ⟨hal-04094877⟩

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