caa a22 4500 477075061 CHVBK 20180405111437.0 cr unu---uuuuu 170330e19960301xx s 000 0 eng 10.1007/BF02827578 doi (NATIONALLICENCE)springer-10.1007/BF02827578 Defect properties of GaAs by positron annihilation [Elektronische Daten] [Chen Zhiquan, Ma Li, Li Shiqing, Yan Hepin, Wang Shaojie] Positron lifetime and Doppler Broadening spectra have been measured for three types of GaAs semiconductors. Direct evidence of native vacancy-type defects is found in the semi-insulating (SI-type) and n-type sample as its average lifetime {ie45-1} andS-parameter are larger than the bulk value. No positron trapping occurred in p-type GaAs. The lifetime spectrum of n-GaAs has also been measured as a function of temperature. The increase in average lifetime {ie45-2} from 226 ps to 234 ps at the temperature range 95-330 K was observed and was explained by the ionization of the vacancy. The slight increase in bulk lifetime {ie45-3} with the temperature was caused by the lattice expansion and expansion coefficient α=14×10−6K−1 was evaluated. Springer, 1996 positron annihilation nationallicence semiconductors nationallicence defect nationallicence Zhiquan Chen Department of Physics, Wuhan University, 430072, Wuhan, China aut Li Ma Department of Physics, Wuhan University, 430072, Wuhan, China aut Shiqing Li Department of Physics, Wuhan University, 430072, Wuhan, China aut Hepin Yan Department of Physics, Wuhan University, 430072, Wuhan, China aut Shaojie Wang Department of Physics, Wuhan University, 430072, Wuhan, China aut Wuhan University Journal of Natural Sciences Wuhan University 1/1(1996-03-01), 45-48 1007-1202 1:1<45 1996 1 11859 https://doi.org/10.1007/BF02827578 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02827578 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Zhiquan Chen Department of Physics, Wuhan University, 430072, Wuhan, China aut NATIONALLICENCE 700 1- Li Ma Department of Physics, Wuhan University, 430072, Wuhan, China aut NATIONALLICENCE 700 1- Shiqing Li Department of Physics, Wuhan University, 430072, Wuhan, China aut NATIONALLICENCE 700 1- Hepin Yan Department of Physics, Wuhan University, 430072, Wuhan, China aut NATIONALLICENCE 700 1- Shaojie Wang Department of Physics, Wuhan University, 430072, Wuhan, China aut NATIONALLICENCE 773 0- Wuhan University Journal of Natural Sciences Wuhan University 1/1(1996-03-01), 45-48 1007-1202 1:1<45 1996 1 11859 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer