Polymer light-emitting devices and solar cells

 

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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 an extremely high open-circuit voltage that is independent of the electrode work function.

Prof. Jun Gao
Department of Physics, Engineering Physics and Astronomy
Queen's University
Kingston, K7L 3N6
Ontario, Canada
Tel: (613)5336788
Fax: (613)5336463 Email

Our research is supported by:

SELECTED RECENT PUBLICATIONS

Scanning photocurrent and photoluminescence imaging of a frozen polymer p-n junction by A. Inayeh, B. Dorin and J. Gao in Applied Physics Letters 101, 253305 (2012) Download

Direct imaging and probing of the p-n junction in a planar polymer light-emitting electrochemical cell by Y. Hu and J. Gao in Journal of the American Chemical Sociey 133: 2227 (2011) Download

Direct probing of a polymer electrolyte/luminescent polymer mixed ionic/electronic conductor by Y. Hu and J. Gao in Journal of the American Chemical Sociey 131: 18236 (2009) 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

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

Visualization of electrochemical doping and light-emitting junction formation in conjugated polymer films by J. Gao and J. Dane in Applied Physics Letters 84:2778 (2004) Download

Planar polymer light-emitting electrochemical cells with extremely large interelectrode spacing by J. Gao and J. Dane in Applied Physics Letters 83:3027 (2003) Download