This document discusses self-assembled monolayers (SAMs) and their potential applications in nanoelectronics. SAMs are organized layers of amphiphilic molecules that spontaneously assemble on substrates like silicon. They have three parts - a head group that attaches to the substrate, an alkyl chain, and a surface group. SAMs can be characterized and patterned using lithography techniques. Electronic conduction in SAMs occurs through tunneling between energy levels. Potential SAM devices include molecular rectifiers and transistors, which could enable smaller, more efficient electronics. Challenges include the difficulty of nano-scale lithography manufacturing.

1. Nano Electronics
By
Bharanidharan G
Jesuraj J

2. Introduction
Basics of SAMs
Characterization of SAMs
Lithography
Conduction in SAMs
SAM Devices
Conclusion

3. Current trends in nanoelectronics
The development of new applications.
 The miniaturization of existing ones.
This gives the idea to emerge a new field
Molecular Electronics fulfill the need.

4. Introduction
Basics of SAMs
Characterization of SAMs
Lithography
Conduction in SAMs
SAM Devices
Conclusion

5. A self assembled monolayer (SAM) is an
organized layer of amphiphilic molecules .
The interesting fact is
these layers are water
loving and fat loving.
This property of SAM
makes it to be
implemented in medical
field.

6. They assemble themselves on a substrate
namely silicon.
They have three parts ,they are head group ,
alkyl chain ,surface group.
 Head group gets adsorbed
on substrate.
 Alkyl chain links head
group and the surface group.
Surface group forms a layer to attach metal
group.

7. Introduction
Basics of SAMs
Characterization of SAMs
Lithography
Conduction in SAMs
SAM Devices
Conclusion

8. Processes of the SAM formation on a native silicon oxide
surface of Si is followed by thorough rinsing in DI water then
drying under nitrogen.

9. Introduction
Basics of SAMs
Characterization of SAMs
Lithography
Conduction in SAMs
SAM Devices
Conclusion

10. 1. A “stamp” with desired
pattern is made from an
elastomeric material called
polydimethylsiloxane
(PDMS) .
2. Deposition of Au (20–200 nm
thickness) .
3. The stamping of the monolayer.
4. The removal of stamp leads
to the transfer of Au patterns on
SAM .

11. Introduction
Basics of SAMs
Characterization of SAMs
Lithography
Conduction in SAMs
SAM Devices
Conclusion

12. Electronic conduction in SAMs
Conduction takes place between HOMO and
LOMO layer.
Conductions are mainly due to Tunneling effect.

13. Introduction
Basics of SAMs
Characterization of SAMs
Lithography
Conduction in SAMs
SAM Devices
Conclusion

14. Molecular rectifier
Molecular transistor

15. Advantages
The size is few nano meters so consequently the size of device
reduces.
No waste of energy due to heat dissipation .
Thus efficiency of the system increases and the operation is
precise.

16. Disadvantages
The lithography technique is minute
in nano scale so difficult to
manufacture.
Should be handled carefully.