Articles you may be interested inA system and methodologies for absolute quantum efficiency measurements from the vacuum ultraviolet through the near infrared Rev. Sci. Instrum. 82, 043102 (2011); 10.1063/1.3574220 Transparent organic photodiodes with high quantum efficiency in the near infrared Appl. Phys. Lett. 97, 033303 (2010); 10.1063/1.3464967 Enhanced efficiency in near-infrared inorganic/organic hybrid optical upconverter with an embedded mirror J. Appl. Phys. 103, 103112 (2008); 10.1063/1.2927491 Excimer-based red/near-infrared organic light-emitting diodes with very high quantum efficiency Appl. Phys. Lett. 92, 113302 (2008); 10.1063/1.2898159 Quantum efficiency of the internal photoelectric effect in silicon and germanium
An experimental study is made of the photoelectric emission from tantalum as it depends directly on accelerating electric field. Observations cover a range of fields from 0 to 90 kv/cm and illumination wavelengths from 248 to 300 mμ. The results are in agreement with the Fowler photoelectric theory modified by a Schottky lowering of the surface barrier. No evidence is found for a periodic deviation from this regular behavior such as exists in its thermionic counterpart, but experimental conditions may have been inadequate for the observation of such a deviation. A new method of threshold measurement at high fields is described and applied to drawn tantalum filaments of circular cross section. The resulting value is 4.16 ev for freshly flashed specimens and it is suggested that this is slightly greater than the lowest work function present in the surface. A Fowler determination in the same field range yields 4.13 ev. The influence of nonuniformity of the surface work function on the field dependence of photoemission and on threshold measurements is discussed.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.