Abstract
A novel photovoltaic phenomenon of internal photoemission was found in a low cost manganite La0.62Ca0.29K0.09MnO3 (LCKMO)/zinc oxide (ZnO) heterojunction bilayers grown on ITO substrate by pulsed laser deposition (PLD) at relative low growth temperature. The heterostructure ITO/LCKMO/ZnO/Al exhibits reproducible rectifying characteristics and light current under continuous laser irradiation of λ = 325 nm. We report here the influence of LCKMO/ZnO bilayers’ thickness on the electrical and photoelectric properties of the heterostructure at room temperature. The power conversion efficiency (PCE) is achieved when the LCKMO and ZnO layers are thin enough or the full space charge layer is sufficient. We obtained the maximum value of PCE of 0.0145% when the thicknesses of LCKMO and ZnO layers are 25 and 150 nm, respectively. The open circuit voltage is 0.04 V under this condition due to the internal photoemission.
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Zhang, J., Huang, K., Si, W. et al. Novel internal photoemission in manganite/ZnO heterostructure. Sci. China Chem. 56, 583–587 (2013). https://doi.org/10.1007/s11426-012-4813-5
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DOI: https://doi.org/10.1007/s11426-012-4813-5