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An Investigation of the Applicability of TES-Pentacene in Photovoltaic Devices

An Investigation of the Applicability of TES-Pentacene in Photovoltaic Devices. David Lehr. hv. Mechanisms of Photovoltaics. Materials. P-type or P-doped Energy causes a bound electron to bind to another site leaving a hole behind. Electrons move in a “domino effect” filling holes.

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An Investigation of the Applicability of TES-Pentacene in Photovoltaic Devices

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  1. An Investigation of the Applicability of TES-Pentacene in Photovoltaic Devices David Lehr

  2. hv Mechanisms of Photovoltaics Materials P-type or P-doped Energy causes a bound electron to bind to another site leaving a hole behind. Electrons move in a “domino effect” filling holes. N –type or N-doped Energy allows electrons to escape the pull of a nucleus and move freely through the material. hv

  3. Light excites carriers in n and p regions Charges rush together at the junction creating a charge buildup that acts as a barrier E field results and pushes charge backwards, potentially powering a circuit N - - - - - - - - - - - + + + + + + + + + + + + + P Junction

  4. Photo-effect in Pentacene

  5. Theory 1 • Electrons absorb energy and move from pentacene backbone into insulating functional groups. • Functional groups act as traps. • Holes are left behind creating a conduction channel in the backbone. • System relaxes and electrons are released from traps filling holes and closing conduction channel.

  6. First Cell

  7. It Works! A little bit

  8. Barrier Trouble • Because of the difference in work function at the pentacene/ITO interface, there is a potential energy barrier. • Buffer layer may help more carriers cross the barrier2.

  9. Second Type of Cell

  10. It Works A little better

  11. IV Characteristics

  12. Heating Tricks3

  13. Conclusions • Pentacene doesn’t seem ideal for photovoltaics, but it does work on a small scale. • The charge of the carriers in pentacene photo-effect may not be as hypothesized.

  14. Acknowledgements • This research was supported by the National Science Foundation through the REU program. Many of the supplies were provided by the Brooks Condensed Matter Research group at the National High Magnetic Field Laboratory. This research was also made possible by the Center for Integrating Research and Learning at the National High Magnetic Field Laboratory. • Special thanks to Dr. James Brooks, Dr. Jin Gyo Park, and Ms. Stacy Vanderlaan.

  15. References [1] J.S. Brooks, T. Tokumoto, E-S Choi, D. Graf, N.Biskup, D.L. Eaton. Persistent photo-excited conducting states in functionalized Pentacene. J. Appl. Phys. In Press. [2] I. Yoo, M. Lee, C. Lee, D-W. Kim, I.S. Moon, D-H. Hwang. The effect of a buffer layer on the photovoltaic properties of solar cells with P3OT: Fullerene Composites. ICSM 2004 Wollongong Aust. To be Published. [3] V. Dyakonov, J. Parisi, D. Chirvase, I. Riedel. Realisation of polymer-fullerene solar cells with low recombination losses. ICSM 2004 Wollongong Aust. To be Published.

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