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Published on January 24, 2008

Author: Carla

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Device Physics of Nanocrystalline (and Amorphous) Silicon Solar Cells:  Device Physics of Nanocrystalline (and Amorphous) Silicon Solar Cells Eric Schiff Syracuse University Forschungszentrum Jülich: Thorsten Dylla, Friedhelm Finger NREL: Howard Branz, Dick Crandall, Paul Stradins, Qi Wang, Kai Zhu Penn State: Joshua Pearce, Chris Wronski United Solar: Gautam Ganguly, Subhendu Guha, Baojie Yan, Jeff Yang Syracuse: Steluta Dinca, Jianjun Liang NREL Amorphous Silicon Team Meeting, April 17, 2006, San Francisco. Themes:  Themes VOC: mainly bandtail recombination a-Si:H, probably nc-Si:H too. Fill-factors: mainly hole mobilities a-Si:H, possibly nc-Si:H too. Bandtails affect both VOC and FF - but differently Metastability in a-Si:H (J. Liang talk, Tuesday morn) Apparently driven by bandtail recombination Apparently consistent with H-collision “Self limiting:” Saturation occurs at 300K when defect recombination traffic becomes comparable to bandtail recombination traffic Toy Model for a Low-mobility pin Solar Cell:  Toy Model for a Low-mobility pin Solar Cell E. A. Schiff, J. Non-Cryst. Solids, in press (ICANS 2005). [.pdf] E. A. Schiff, Solar Cells and Solar Energy Materials 78, 567-595 (2003).[.pdf] Hole Drift-Mobilities in Disordered Silicons:  Hole Drift-Mobilities in Disordered Silicons E. A. Schiff, J. Non-Cryst. Solids, in press (ICANS 2005).[.pdf] nc-Si:H - T. Dylla, F. Finger, and E. A. Schiff, Appl. Phys. Lett. 87, 032103 (2006) [.pdf]. E. A. Schiff, J. Phys.: Condens. Matter 16, S5265-5275 (2004) [.pdf]. Bandtail Multiple-Trapping Model for Hole Drift Mobility:  Bandtail Multiple-Trapping Model for Hole Drift Mobility Power Density vs. Temperature: A Test for Mobility Limitation:  Power Density vs. Temperature: A Test for Mobility Limitation L. Jiang, E. A. Schiff, S. Guha, B. Yan, and J. Yang, Appl. Phys. Lett. 88 063512 (2006).[.pdf] VOC in Amorphous and Nanocrystalline Silicon:  VOC in Amorphous and Nanocrystalline Silicon Hole Drift-Mobilities in Disordered Silicons:  Hole Drift-Mobilities in Disordered Silicons Detailed balance: n = Nvbt VOC in Nanocrystalline Silicon: Bandtail Recombination:  VOC in Nanocrystalline Silicon: Bandtail Recombination Fill-Factor in Nanocrystalline Silicon Solar Cells:  Fill-Factor in Nanocrystalline Silicon Solar Cells Modeling Issues in Nanocrystalline Silicon Solar Cells:  Modeling Issues in Nanocrystalline Silicon Solar Cells VOC: Bandtail recombination predictions look about right T-dependence to confirm? FF: Mobility-based predictions are somewhat too large Mobility parameters from expt. not representative of current optimized solar cells? Jsc: Do amorphous regions “sensitize” nanocrystalline cells? How Low-Mobility Solar Cells Work:  How Low-Mobility Solar Cells Work Electron-Hole Recombination Quasi-Fermi Levels VOC Hole Drift Mobility Space-Charge Photocurrent Density Photogeneration Power United Solar Ovonic Cells: Temperature Effects:  United Solar Ovonic Cells: Temperature Effects United Solar Ovonic cells 685 nm laser illumination Lines are computer calculations As-deposited: only bandtails significant Light-soaked: bandtail+defect Defect density about 2x1016 cm-3 Defect parameter values from Street’s deep-trapping measurements L. Jiang, E. A. Schiff, S. Guha, B. Yan, and J. Yang, Appl. Phys. Lett. 88 063512 (2006). What if – hole mobility increases?:  What if – hole mobility increases? E. A. Schiff, unpublished Power Density: Hole Mobility Model:  Power Density: Hole Mobility Model http://physics.syr.edu/~schiff/AMPS/ K. Zhu, et al., in Amorphous and Nanocrystalline Silicon Based Films – 2003, edited by J.R. Abelson, et al. (Materials Research Society Symp. Proc. Vol. 762, Pittsburgh, 2003), pp. 297--302.[.pdf] Temperature-depedent Bandgap of c-Si:  Temperature-depedent Bandgap of c-Si Low-mobility pin Solar Cells: “Toy” Model and Analytical Solution:  Low-mobility pin Solar Cells: “Toy” Model and Analytical Solution E. A. Schiff, Solar Cells and Solar Energy Materials 78, 567-595 (2003).[.pdf] Mobility Is Power: Computer and Analytical Calculations:  Mobility Is Power: Computer and Analytical Calculations E. A. Schiff, J. Non-Cryst. Solids, in press (ICANS 2005). Toy Model for a Low-mobility pin Solar Cell:  Toy Model for a Low-mobility pin Solar Cell

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