This document discusses a batteryless phone that is powered by harvesting ambient light and radio frequency (RF) waves using a photo diode. The phone's only function is calling. It operates by using the RF waves to convert the harvested energy to direct current power. Solar cells in the phone work by using a P-N junction diode made of silicon or germanium to generate open spaces for light to fall on the P layer and excite electrons from the valence to conduction band. Advantages include conserving electricity, saving time, and low power consumption with no charging issues. Limitations are limited range, reliance on solar cell or ambient light, and lack of additional features. Future areas of development could include increasing the range, adding encryption and

1. SYED HEENA
19F01A04M2
ECE
1

2. CONTEN
TS
2
INTRODUCTION
HOW ITS WORKS
ADVANTAGES
LIMITATIONS
FUTURE ENHANCEMENTS
CONCLUTION
REFERENCES

3. INTRODUCTI
ON
3
Even the companies that phones at
sell smart
rates have the issue of battery’s
phenomenal
performance.
The performance is better as compared to others, but it is
still a mystery if discussed in terms of long life.

4. What is batteryless
phone?
4
Needed no battery.
Phone used to only calling function.
device uses a minute photo diode to harvest energy from the
ambient light or RF sources.
It operate the RF wave to convert DC power.

5. Conversion of RF to DC
power
5

6. How solar cell
works? which is
Solar cell constitutes of P-N junction diode,
assembled from Silicon and Germanium.
This process constructs open space for light to fall on P layer
and hence underlying the P-N junction.
The bottom of N layer comprises of current assembling
electrode.
When a light photon arrives at the junction, they exhilarate
electrons from valence band to conduction band.
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7. A solar cell used as in
the battery less
phone
7

8. ADVANTAG
ES
8
Conserves Electricity
Saves Time
Low Power Consumption
No Charging Issues

9. LIMITATIO
NS
9
Limited range
Use of solar cell
Lacking multiple operational features

10. FUTURE
SCOPE
10
Increase in the range
Encryption
Video streming
Internet access
Low power E-ink display

11. CONCLUSI
ON
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It was extremely astonishing to witness that a group of
researchers have finally developed a phone that uses no
power.
which means the phone has no battery and harnesses energy
from ambient signals and light sources.
That convert light and signal strength into a current which is
furthermore converted into few microwatts of power.
With the phone, we can just dial a number and call to another
person.

12. Thank You!