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Circuit Yield of Organic Integrated Electronics

Circuit Yield of Organic Integrated Electronics. ASIC Class Presentation By: Mohammad Mottaghi Based on a paper from ISSCC2003 All credits go to the original contributors. Motivations for organic elec…. Organic TFTs show poor performance compared to silicon CMOS

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Circuit Yield of Organic Integrated Electronics

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  1. Circuit Yield of Organic Integrated Electronics ASIC Class Presentation By: Mohammad Mottaghi Based on a paper from ISSCC2003 All credits go to the original contributors.

  2. Motivations for organic elec… • Organic TFTs show poor performance compared to silicon CMOS • But organic TFTs also show the potential for extremely low cost production (printing) • Organic TFTs are in a stage of development as silicon MOSFETs were 30 years ago • Organic TFT electronics certainly will not replace CMOS • But organic TFT electronics may open new low cost / low performance (but high volume!) markets

  3. Polymer electronics • Low-end, high volume electronic applications, based on: • Mechanical flexibility • Low-cost • Large area • Potential applications: • Electronic barcodes • Memories • Displays (e-paper)

  4. E-paper

  5. Key feature: solution processing

  6. Materials and technology

  7. Technology

  8. Equivalent Circuit

  9. Operation of the polymer transistor

  10. Operation of the polymer transistor

  11. Mobility of organic semiconductors

  12. Applications of organic ICs

  13. Block diagram of an identification tag

  14. Design of organic identification tags

  15. Design of organic identification tags

  16. Design of organic identification tags

  17. Design of organic identification tags • Characteristics of the code generators

  18. Design of organic identification tags • The 48 bit identification IC

  19. Yield of organic circuits • Measured code generator yield

  20. Outline • Introduction: • Applications of organic ICs • Design of organic identification tags • Yield of organic circuits: • Measurements • Analysis • Improvement by design • Conclusions

  21. Yield of organic circuits • Possible causes of yield loss • Hard faults • Less then one vertical short /20mm2 • Parameter spread is too large • No experimental evidence • Parameter values result in small noise margin for the logic style used • Small parameter variations can make the gate fail

  22. Yield of organic circuits • Inverter intrinsic noise margin

  23. Yield of organic circuits • Inverter noise margin

  24. Yield of organic circuits • How do transistor parameters influence the noise margin?

  25. Yield of organic circuits

  26. Yield of organic circuits • Semiconductor conductivity

  27. Yield of organic circuits • Semiconductor mobility

  28. Yield of organic circuits • Inverter noise margin: Impact of technology and design parameters

  29. Yield of organic circuits • NAND noise margin

  30. Yield of organic circuits • NAND noise margin

  31. Outline • Introduction: • Applications of organic ICs • Design of organic identification tags • Yield of organic circuits: • Measurements • Analysis • Improvement by design • Conclusions

  32. Yield of organic circuits • Yield improvement by design Use of a level shifter to move the trip level

  33. Yield of organic circuits • Test vehicle: a shift register IC

  34. Yield of organic circuits • Test vehicle: a shift register IC

  35. Yield of organic circuits • Shift register IC: measurement results

  36. Yield of organic circuits • Output of a 32 stage shift register employing level shifters • Largest organic circuit to date (1888 transistors)

  37. Yield of organic circuits • Shift register IC: preliminary yield results • Shift register without level shifter: functional but still no circuit with more than two working FFs • Shift register with level shifter: 30% yield on the 32 FF circuit

  38. Conclusions • The main causes of the low yield have been understood • The new circuit solution shows a substantially better yield • The most complex organic circuit to date has been measured

  39. Thank you for your attention! Any question ?

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