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所属单位：材料科学与技术学院

发表刊物：SCIENCE CHINA-TECHNOLOGICAL SCIENCES

关键字：vacuum degree betavoltaic apparent activity density energy conversion unit MCNP5

摘要：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 employing Ni-63 with an apparent emission activity density of 7.26x10(7) and 1.81x10(8) Bq cm(-2), betavoltaic performance levels were calculated at a vacuum degree range of 1x10(5) to 1x10(-1) Pa and measured at 1.0x10(5) and 1.0x10(4) Pa, respectively. Results show that betavoltaic performance levels improve significantly as the vacuum degree increases. The maximum output power (P (max)) exhibits the largest change, followed by short-circuit current (I (sc)), open-circuit voltage (V (oc)), and fill factor. The vacuum degree effects on I (sc), V (oc), and P (max) of the betavoltaic with low apparent activity density Ni-63 are more significant than those of the betavoltaic with high apparent activity density Ni-63. Moreover, the improved efficiencies of the measured performances are larger than the calculated efficiencies because of the low ratio of I (sc) and reverse saturation current (I (0)). The values of I (0), 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.

ISSN号：1674-7321

是否译文：否

发表时间：2017-02-01

合写作者：许志恒,,汤晓斌

通讯作者：刘云鹏