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| Polymer Semiconductors and Devices |
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INTRODUCTION Most polymers we encounter in our everyday life are insulators. However, certain conjugated polymers are not only conductors, but also excellent light emitters and light absorbers. Polymer photonic devices such as polymer light-emitting diodes and polymer solar cells offer potential performance and cost advantages over their inorganic counterparts. A polymer light-emitting electrochemical cells (LEC) is a solid-state device operating on the principle of in situ electrochemical doping. LECs are attractive candidates for potential display and energy conversion applications. Because of doping, LECs have dramatically reduced bulk and contact resistance. We have recently demonstrated world's largest planar LECs with an interelectrode spacing of 11 mm. The extremely large planar devices offer unparalleled spatial and temporal resolution for direct imaging of many intriguing electrical and optical processes. When operated as a photovoltaic cell, LECs also display extremely high open-circuit voltage in an unique "bulk homojunction" configuration. |
Prof. Jun Gao Our research is supported by:
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SELECTED RECENT PUBLICATIONS Planar polymer photovoltaic cells with millimeter interelectrode spacing by J. Gao, J. Hui, Y. Hou and S. Alem in Journal of Applied Physics 084512 (2008) Download Bulk electroluminescence from conjugated polymer thin films via the formation of gold nanoislands by W. Bonnet, C. Tracy, G. Wantz, G. Liu and J. Gao in Small 10, 1707 (2008) Download How electrode work function affects doping and electroluminescence of polymer light-emitting electrochemical cells by D. Hohertz and J. Gao in Advanced Materials, 20, 3298 (2008) Download Photovoltaic response of a polymer p-i-n junction by Y. Zhang, Y. Hu and J. Gao in Applied Physics Letters, 91, 233509 (2007) Download Lifetime study of polymer light-emitting electrochemical cells by Y. Zhang and J. Gao in Journal of Applied Physics 100, 084501 (2006) Download Improving the efficiency of polymer light-emitting electrochemical cells by controlled doping relaxation by Y. Zhang, Y. Hu and J. Gao in Applied Physics Letters 88, 163507 (2006) Download High-resolution imaging of electrochemical doping and dedoping processes in luminescent conjugated polymers by Y. Hu, C. Tracy and J. Gao in Applied Physics Letters 88, 123507 (2006) Download Polymer bulk homojunction photonic devices by C. Tracy and J. Gao in Applied Physics Letters 87, 143502 (2005) Download
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