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current injection in organic electronics Edit 2359h 14/4


Jon Chen

on 19 April 2013

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Transcript of current injection in organic electronics Edit 2359h 14/4

Challenge 3:
Efficiency Kevin Lim
Jonathan Chen
Soh Yong Sheng Conclusion Challenge 2:
Injection High injection barriers Current Injection in Organic Electronics Challenge 1:
Conductivity Motivation Prospects & Future works The
Beginning Past progress & present prospects Challenge 4:
Transport Presented by: Mentors: Seah Wei Ling
Rebecca Khoo Presented to you by Movie still: Minority Report (2002) http://img.optics.org/objects/news/thumb/2/4/24/Eight19large1.jpg http://ecofriend.com/wp-content/uploads/2012/07/bipv_curtain_wall_zkxqw.jpg http://www.tomcruise.com/blog/wp-content/uploads/2011/01/Kinect-Minority-Report-UI-2.jpg Frenger, P., "Edible Organic Semiconductors," Green Technologies Conference, 2012 IEEE , vol., no., pp.1,1, 19-20 April 2012 http://upload.wikimedia.org/wikipedia/commons/d/d8/Flexible_display.jpg ...and
Low material cost
Wide range of material choice
Cheap manufacturing equipment Alan G. MacDiarmid Alan J. Heeger Hideki Shirakawa From insulator... ...to conductor Mobility Conductivity Carrier charge Carrier concentration e- H + Charges available
for conduction Doping introduces additional charge carriers p-type n-type Iodine-doped polyacetylene The band theory perspective Increased number of charge carriers Improved charge carrier concentration Quantum efficiency Better conductivity achieved "The Nobel Prize in Chemistry 2000". Nobelprize.org. 19 Apr 2013 http://www.nobelprize.org/nobel_prizes/chemistry/laureates/2000/ Conjugation, conjugation, conjugation http://upload.wikimedia.org/wikipedia/commons/thumb/3/3c/Polyacetylene-3D-balls.png/800px-Polyacetylene-3D-balls.png Injection vs. Transport Polarons are not very mobile Trapping immobilises charges Disorder decreases mobility Mobility and conductivity Drift velocity Mobility Better conductivity Charges have to drag their lattice distortions along with them Hopping between disordered states requires thermal energy Trapped charges are no longer free to conduct electricity Transport and Mobility Drift velocity Mobility Current injection
at interfaces US$30 billion industry by 2015 http://www.solarpanel-manufacturer.com/picture/solar-panel-system/solar-panel-tracking-system.jpg Alq3 CuPc PCBM F8BT http://cdn0.mos.techradar.com///art/other/Onetimers/FIPEL%20light-580-75.jpg Selection of materials with the appropriate work function Charge carrier occupancy of a semiconductor “Organic Electronics for a Better Tomorrow: Innovation, Accessibility, Sustainability.” Chemical Sciences and Society Summit. 2013. 19 Apr. 2013
<http://www.rsc.org/images/2012-CS3-White-Paper_tcm18-229347.pdf>. Excitons can only decay radiatively in the emission layer (EL). Device efficiency
and performance Current transport
in the bulk Organic electronics on the market OLED displays
Galaxy S3
PlayStation Vita
etc... Electron-hole injection ratio Outcoupling efficiency Luminescence yield OTFTs in banknotes
low voltage OPV power generation
low cost
large-area coverage Low http://www.wired.com/images_blogs/gadgetlab/images/2009/03/14/oled_01.jpg Improved mobility Exciton decay fraction 25% of excitons undergo radiative decay exciton electron-hole pair
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