nano gener

1. Piezoelectric Nanogenerator
Muzammil Rehman
Student ID: MPHF17BM10
M.Sc Physics (Sem-IV)
Department of Physics UOS Sub Campus Bhakkar

2. Piezoelectricity
• Piezoelectricity:
• Piezoelectric isthe generationof electric field from
applied pressure.
• It was first discovered by Curie Brother in 1880.
• It is observed in crystalline materialwith no inversion
symmetry.

3. Piezoelectric effect
• Piezoelectric effect (Greek piezo: push): is the ability of certain
materials to generate an electric charge in response to the applied
mechanical stress.
• Materials
• Piezoelectric materials involve Berlinite (structurally identical to
quartz), cane sugar, quartz and Rochelle salt.

4. Piezoelectric effect
Apply Force
Apply Force
Electric Field
Charge
accumulation

5. Piezoelectric Nanogenerator
• A piezoelectric nanogenerator is an energy harvesting device capable
of converting external kinetic energy into electrical energy via action
by a nano-structured piezoelectric material.
• First introduced by
Zhong Lin Wang in 2006.
Prof. Zhong Lin Wang at Georgia Institute of
Technology, Georgia state, USA.

6. Mechanism
• The working principle of Nano generator will be explained for 2
different cases:
Two cases:
• Force exerted ⊥ to nanowire
• Force exerted || to nanowire

7. •Force exerted ⊥ to nanowire :
(a) A tip is swept through the tip of the nanowire. Only the negatively
charged portion will allow the current to flow through the interface.
(b) The nanowire is integrated with the counter electrode by using a tip-like
grating. As of (a), the electrons are transported from the compressed
portion of nanowire to the counter electrode because of Schottky contact.
Schottky barrier: (A) Before contact. (B) After contact (C)
Reverse bias, (positively charged section of NW) (D)
Forward bias (negatively charged section of NW)

8. For maximum voltage
• The maximum voltage generated in the nanowire can be calculated by the
following equation.

9. Force exerted || to nanowire

10. Geometrical configuration
• Three types:
• VING - Vertical nanowire Integrated Nanogenerator
• LING - Lateral nanowire Integrated Nanogenerator
• NEG - Nanocomposite Electrical Generators

11. VING
• 3D configuration
• Consists of an electrode, a NW array and
• a counter electrode.
• Partial contact
• – Geometry of counter electrode important.
• – DC
• Full contact
• – Good for || force
• – AC

12. LING
• 2D configuration
• Consists of a base electrode, a
• laterally grown piezoelectric
• nanostructure and a metal electrode
• for schottky contact.
• LING is an expansion of the single wire
• generator (SWG)

13. NEG
• 3D configuration
• Consists of a metal plate
• electrodes and a vertically grown
• NW array in a polymer matrix.
• Flexibility , large area and small
• thickness.

14. Applications of Piezoelectric Nanogenerators
• Applications of Piezoelectric Nanogenerators
• Self-powered Nano/micro devices
• Smart Wearable Systems
• Transparent and Flexible Devices
• Implantable Telemetric Energy Receiver

15. •Thank You