Context :
Extract :
A new nanogenerator device developed for harvesting light energy using organic material has the potential to power wearable devices on the go.
The device can generate current and voltage from minute amounts of heat
or light that fall on it.
The
scientific community has been making ceaseless efforts to meet the ever-growing
energy demand. Harnessing energy from the nano regime is a prime focus, and
exploring energy generation from organic materials is highly useful for
sustainability.
Scientists at the Institute of Advanced Study in Science and Technology (IASST), an autonomous institute of the Department of Science and Technology (DST), Govt. of India, have developed a nanogenerator device for harvesting light energy using organic material, which has the potential to power wearable devices on the go.
The device can generate current and voltage from minute amounts of heat
or light that fall on it.
The
experimental exploration of energy materials by the team at IASST has led to
the successful synthesis of an organic energy material called
polyaniline-rubrene, and they have fabricated an Organic Pyroelectric
Nanogenerator (OPyNG). This work has recently been published in the journal
Nano Energy.
The device features an architectural design, as depicted in the accompanying figure, with polycrystalline graphene oxide and polyaniline-rubrene forming a rectifying junction. In this configuration, the polyaniline-rubrene thin film serves as the photoactive layer responsible for generating charge carriers. The pyroelectric effect of the device is induced by the light-induced change in spontaneous polarization occurring in the ultra-thin oxidized surface layer of the polyaniline-rubrene thin film.
The working principle of the device is based
on the pyro-phototronic effect. This effect holds a unique advantage in the
pyroelectric nanogenerator (PyNG), as it can optically induce the pyroelectric
effect, which is useful for energy harvesting.
The fabricated OPyNG device utilizing organic material provides new insights and opens up new avenues for harvesting energy from organic materials.
The OPyNG
operates in the UV-visible-NIR region in self-powered mode, and it offers
significant advantages as it can function as a self-sustainable standalone
device.
The fabricated device demonstrates the
highest output at a wavelength of 405-450 nm, with responsivity of 167.12 mA/W,
external quantum efficiency of 51.16%, and internal quantum efficiency of
63.59%.
Additionally, the device exhibits a voltage generation of approximately 157.75 mV and a volume power density of about 51 mW/cm3.
These achievements are commendable, especially considering the small area of the device, which is only 1 cm2.
Furthermore, the device boasts a fast response time of a few tens of milliseconds.
Given these characteristics, the device holds potential for the development of
various self-powered sensors for applications in healthcare, optoelectronics,
and IoT technology.
MY TAKE :
For past few years, I have been advocating embedding RFID sensors in high
denomination
currency notes
Idea is to enable such notes to communicate to Income Tax department Central
MONEY –
TRACKING server / software, through any nearby Mobile Phone
If
implemented, this could drastically reduce the menace of BLACK MONEY
Till now providing power to those RFID sensors ( without also embedding a
miniscule
battery in each note ) is a problem
May be IASST
team’s innovation can overcome this limitation
I urge IASST scientists to carry out further experiments to establish feasibility of
my
suggestion
With regards,
Hemen Parekh
www.hemenparekh.ai / 24
July 2023
RELATED READINGS :
NETWORK OF
CURRENCY NOTES ? ……………………………..[ 03 Nov 2015 ]
How to conquer
Corruption ? ………………………………………..[ 21 Dec 2015 ]
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