2015
DOI: 10.1007/s10854-015-2665-4
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Cesium, oxygen coadsorption on AlGaN(0001) surface: experimental research and ab initio calculations

Abstract: Cs, O activation experiment of Al 0.24 Ga 0.76 N photocathodes was carried out and the photocurrent variation was recorded. Then first principle calculations were performed to study Cs, O coadsorption on Al 0.25 Ga 0.75-N(0001) surface. Three surface models were built, one model represents pure surface, and the other two are defective surface models with Ga or N vacancy on the topmost layer. Cs only adsorption systems were built based on clean surface, and Cs, O coadsorption systems were built based on the thr… Show more

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Cited by 8 publications
(1 citation statement)
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“…The results suggest that there is an optimum state of Cs/O 2 co-deposition with a low work function, and an oversupply of Cs and O 2 leads to an increase in the work function. 12,27,28) The maximum J measured at V C = 30 V for Al 0.5 Ga 0.5 N and Al 0.75 Ga 0.25 N emitter with low Si doping concentration of 1 × 10 18 cm −3 were 5.2 × 10 −4 A cm −2 (Cs(3)/O 2 (2)) and 5.8 × 10 −4 A cm −2 (Cs(3)/O 2 (2)), respectively, which values were about 14 and 11 times higher than those obtained with Cs-only deposition (Cs(1)/O 2 (0)), respectively. The maximum J measured at V C = 30 V for Al 0.5 Ga 0.5 N and Al 0.75 Ga 0.25 N emitter with high Si doping concentration of 6 × 10 18 cm −3 were 1.9 × 10 −3 A cm −2 (Cs(6)/O 2 (5)) and 2.1 × 10 −3 A cm −2 (Cs(6)/O 2 (5)), respectively, which values were about 90 times higher than those obtained with Cs-only deposition (Cs(1)/O 2 (0)), respectively.…”
Section: Modified Richardson-dushman Model (Mrm)mentioning
confidence: 99%
“…The results suggest that there is an optimum state of Cs/O 2 co-deposition with a low work function, and an oversupply of Cs and O 2 leads to an increase in the work function. 12,27,28) The maximum J measured at V C = 30 V for Al 0.5 Ga 0.5 N and Al 0.75 Ga 0.25 N emitter with low Si doping concentration of 1 × 10 18 cm −3 were 5.2 × 10 −4 A cm −2 (Cs(3)/O 2 (2)) and 5.8 × 10 −4 A cm −2 (Cs(3)/O 2 (2)), respectively, which values were about 14 and 11 times higher than those obtained with Cs-only deposition (Cs(1)/O 2 (0)), respectively. The maximum J measured at V C = 30 V for Al 0.5 Ga 0.5 N and Al 0.75 Ga 0.25 N emitter with high Si doping concentration of 6 × 10 18 cm −3 were 1.9 × 10 −3 A cm −2 (Cs(6)/O 2 (5)) and 2.1 × 10 −3 A cm −2 (Cs(6)/O 2 (5)), respectively, which values were about 90 times higher than those obtained with Cs-only deposition (Cs(1)/O 2 (0)), respectively.…”
Section: Modified Richardson-dushman Model (Mrm)mentioning
confidence: 99%