Absorption enhancement in thin metal-backed solar cells caused by dipole scatterers embedded in the absorbing layer is studied using a semi-analytical approach. The method accounts for changes in the radiation rate produced by layers above and below the dipole, and treats incoherently the subsequent scattering of light in guided modes from other dipoles. We find large absorption enhancements for strongly coupled dipoles, exceeding the ergodic limit in some configurations involving lossless dipoles. An antireflection-coated 100-nm layer of a-Si:H on Ag absorbs up to 87% of incident above-gap light. Thin layers of both strong and weak absorbers show similar strongly enhanced absorption.

Recent Publications

Student authorFaculty author

21. Andrew Higginbotham, Octavi Semonin, S. Bruce, Clarence Chan, David A. Mann, M. Maurer, W. Bang, I. V. Churina, J. Osterholz, I. Kim, T. Ditmire, and Thomas D. Donnelly, “Generation of Mie size microdroplet aerosols with applications in laser-driven fusion experiments”, Rev. Sci. Inst. 80 (2009) 063503.
22. Peter N. Saeta, Harry A. Atwater, Vivian E. Ferry, Jeremy N. Munday, and Domenico Pacifici, “How much can guided modes enhance absorption in thin solar cells?”, Opt. Expr. 17 (2009) 20975-20990.
23. J. Parker, David Mar, J. R. Puzey, John Hankinson, Kevin Byram, C. Lee, M. K. Mayeda, Richard C. Haskell, Qimin Yang, S. Greenfield, and R. Epstein, “Thermal links for the implementation of an optical refrigerator”, J. Appl. Phys. 105 (2009) 013116.
24. S. Kneip, B. I. Cho, D. R. Symes, H. A. Sumeruk, G. Dyer, I. V. Churina, A. V. Belolipetski, A. Henig, O. Werhan, E. Förster, Thomas D. Donnelly, and T. Ditmire, “K-shell Spectroscopy of Plasmas Created by Intense Laser Irradiation of Micron-scale Cone and Sphere Targets”, High Energy Density Physics 4 (2008) 41-48.
25. Junbo Park, S. M. Watson, Caitlyn M. Furjanic, Darya K. Draganova, M. J. Carey, J. A. Borchers, Chih-Yung Chen, Patricia D. Sparks, and James C. Eckert, “Probing the Effect of Structural Roughness on Domain Wall Formation in Spin Valves Using the Off-Specular Reflectivity Technique”, IEEE Trans. Magn. 44 (2008) 2839-2841.
26. Gregory Minton and Vatche Sahakian, “New mechanism for nonlocality from string theory: UV-IR quantum entanglement and its imprints on the CMB”, Phys. Rev. D 77 (2008) 026008.
27. Junbo Park, K. W. Alt, Caitlyn M. Furjanic, Darya K. Draganova, Samuel Eisenberg, D. Tighe, M. J. Carey, J. A. Borchers, Patricia D. Sparks, and James C. Eckert, “Thickness of the Pinned Layer as a Controlling Factor in Domain Wall Formation During Training in IrMn-based Spin Valves”, J. Appl. Phys. 103 (2008) 07C111.
28. H. A. Sumeruk, S. Kneip, D. R. Symes, I. V. Churina, A. V. Belolipetski, Thomas D. Donnelly, and T. Ditmire, “Control of strong-laser-field coupling to electrons in solid targets with wavelength-scale spheres”, Phys. Rev. Lett. 98 (2007) 045001.
29. Thomas M. Helliwell and D. A. Konkowski, “Quantum healing of classical singularities in power-law spacetimes”, Class. Quant. Grav. 24 (2007) 3377-3390.
30. A. D. Mont, P. A. Kienzle, S. M. Watson, J. A. Borchers, James C. Eckert, Patricia D. Sparks, Stephanie M. Moyerman, and M. J. Carey, “Determination of complex magnetic structures from polarized neutron reflectivity data by flexible modeling of depth-dependent vector magnetization”, IEEE Trans. Magn. 2007 (2007) 3346-3348.