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Affiliation of Author(s):材料科学与技术学院

Title of Paper:Vacuum degree effects on betavoltaics irradiated by63Ni with differently apparent activity densities

Journal:Sci. China Technol. Sci.

Abstract:For many current betavoltaics, beta sources and PN junction energy conversion units are separated. The air gap between the two parts could stop part of decay beta particles, which results in inefficient performance of the betavoltaic. By employing63Ni with an apparent emission activity density of 7.26×107and 1.81×108Bq cm−2, betavoltaic performance levels were calculated at a vacuum degree range of 1×105to 1×10−1Pa and measured at 1.0×105and 1.0×104Pa, respectively. Results show that betavoltaic performance levels improve significantly as the vacuum degree increases. The maximum output power (Pmax) exhibits the largest change, followed by short-circuit current (Isc), open-circuit voltage (Voc), and fill factor. The vacuum degree effects on Isc, Voc, and Pmaxof the betavoltaic with low apparent activity density63Ni are more significant than those of the betavoltaic with high apparent activity density63Ni. Moreover, the improved efficiencies of the measured performances are larger than the calculated efficiencies because of the low ratio of Iscand reverse saturation current (I0). The values of I0, ideality factor, and shunt resistance were estimated to modify the equivalent circuit model. The calculation results based on this model are closer to the measurement results. The results of this research can provide a theoretical foundation and experimental reference for the study of vacuum degree effects on betavoltaics of the same kind. © 2016, Science China Press and Springer-Verlag Berlin Heidelberg.

Volume:60

Issue:2

Page Number:282-288

ISSN No.:1674-7321

Translation or Not:no

Date of Publication:2017-02-01

Included Journals:EI