Organic_Electronics

Organic_Electronics - Organic Electronics Opportunities and...

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Organic Electronics: Opportunities and Challenges George Malliaras Department of Materials Science and Engineering, Cornell University Cornell NanoScale Science and Technology Facility Email: [email protected]
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Outline Organic light emitting diodes Organic photovoltaic cells Organic thin film transistors
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Organic electronic devices OLEDs OTFTs OPVs DuPont Sony Konarka General Electric
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Organic semiconductor families Molecularly Doped Functional Small Molecules Polymers (MDP) Polymers
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Common organic semiconductors TPD Alq 3 Pentacene PPV
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Carbon as a semiconductor CH 2 =CH 2 E n = ⎯⎯⎯ n 2 n=1,2,3,. .. ħ 2 π 2 2mL 2 LUMO HOMO E G ≈ ⎯⎯⎯ ħ 2 π 2 2maN Hybridization: sp 2 and p Z Particle in a box: E G
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Tuning of optical properties Blue Red R.E. Gill et. al. , Adv. Mater. 6 , 132 (1994). Covion
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Tuning of electrical properties
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Opportunities and challenges (+) Ease of processing (+) Tunability of electronic properties (+) Integration with biological systems (+/-) Significant ionic mobility (-) Low-end performance (-) Stability in devices Will complement Si, not replace it
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Organic light emitting diodes (OLEDs) Pioneer (2001 - demo) Pioneer (1997) Motorola (2001) Kodak (2004) Sony (2004) Sony (2007)
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OLEDs vs. liquid crystals
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Efficiency of white OLEDs Kido group, Yamagata U. Idemitsu
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Organic_Electronics - Organic Electronics Opportunities and...

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