Photon-enhanced thermionic emission solar energy converters with GaAs wire array cathode under external electric field
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In this work, a theoretical emission model for GaAs wire array cathode based on photon-enhanced thermionic emission (PETE) under the action of external electric field is deduced utilizing two-dimensional continuity equations. With the electron energy distribution and elevation angle of emitted electron considered, the electron collection probability for each emission surface of GaAs wire array cathode varying with the field intensity is simulated. Combining emission current density with electron collection probability, the effective collection current density of GaAs wire array cathode is obtained. Results suggest that the external electric field can effectively enhance the collection probability of emitted electrons within GaAs wire array, which contributes to the improvement of the actual photoelectric conversion capability of GaAs wire array cathodes. For GaAs wire array cathodes, the effective collection current density can reach the maximum value with the incident angle of 20° and field intensity of 0.9 V/μm. Applying a transparent phosphorus-doped diamond film as the anode material, the simulated conversion efficiency increases from 18.85 to 44.80% as the electron affinity of GaAs wire cathode rises from 0 to 0.6 eV.
KeywordsGaAs wire array cathode Photon-enhanced thermionic emission External electric field Electron collection
This work has been partially sponsored by the Qing Lan Project of Jiangsu Province (2017-AD41779), by the Six Talent Peaks Project in Jiangsu Province (2015-XCL-008), by the Fundamental Research Funds for the Central Universities (30916011206).
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Conflict of interest
The authors declare that they have no conflict of interest in either personal or financial aspects.
- Chen SD, Chen YY, Lee SC (2005) Transverse-electric-field-enhanced response in InAs/AlGaAs/GaAs quantum-dot infrared photodetectors. Appl Phys Lett 86(25):6912Google Scholar
- Chen Y, Arinze ES, Pamquist N, Thon SM (2016) Advancing colloidal quantum dot photovoltaic technology. Nanophotonics 5(1):31Google Scholar
- Geronimo GD, Deptuch G, Dragone A, Radeka V, Rehak P, Castodi A, Fazzi A, Guazzoni C, Rijssenbeek M (2006) A novel position and time sensing active pixel sensor with field-assisted electron collection for charged particle tracking and electron microscopy. Nucl Instrum Methods A 568(1):167CrossRefGoogle Scholar
- Kalogirou SA (2014) Solar energy engineering, 2nd edn. ElsevierGoogle Scholar