Umair Gaines
Scientists have been working on converting infrared light to electricity for some time. A recent development in this area is the discovery of a novel material called single-crystalline scandium nitride (ScN) that can emit, detect, and modulate infrared light with high efficiency. This material can be used for solar and thermal energy harvesting. Another method for converting infrared light to electricity involves using a thin-film device that converts infrared radiation directly into electricity. This technology has been applied in night-vision goggles and could potentially be used to recoup wasted energy from hot machines such as industrial generators or car engines.
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What You'll Learn
Single-crystalline scandium nitride (ScN)
Scientists have discovered a novel material called single-crystalline scandium nitride (ScN) that can efficiently emit, detect, and modulate infrared light. This discovery has significant implications for renewable energy, as it enables the conversion of infrared light into a usable form.
The research, conducted by K. C. Maurya and colleagues at Bengaluru's Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), utilised a scientific phenomenon known as polaritons excitations. By carefully controlling the material properties of ScN, they achieved strong light-matter interactions, allowing for the excitation of polaritons, a type of quasi-particle.
Infrared light, which falls beyond the visible light spectrum, has been challenging to utilise due to its long wavelength. However, with the discovery of ScN, this range of light can now be harnessed for various applications. ScN's ability to interact with infrared light makes it ideal for solar and thermal energy harvesting, as it can efficiently convert infrared light into renewable energy. This capability addresses the growing demand for renewable energy sources and contributes to the development of sustainable practices.
Additionally, ScN's compatibility with modern complementary-metal-oxide-semiconductor (CMOS) or Si-chip technology makes it easily integrable with on-chip optical communication devices. This compatibility expands the potential applications of ScN in electronics, healthcare, defence, and security technologies. The integration of ScN in these sectors can lead to advancements in infrared sensing, imaging, and communication systems, enhancing our capabilities beyond the visible light spectrum.
The discovery of single-crystalline scandium nitride (ScN) and its unique properties in interacting with infrared light offers promising opportunities for renewable energy generation and technological advancements. With its high efficiency in emitting, detecting, and modulating infrared light, ScN is poised to play a pivotal role in shaping the future of energy harvesting and optical communication devices. Further research and development will continue to unlock the full potential of this innovative material.
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Solar and thermal energy harvesting
Photovoltaic power generation is a widely recognised method of solar energy harvesting, employing solar panels composed of multiple cells containing photovoltaic materials. These solar panels have been scaled up to industrial sizes, resulting in the establishment of large-scale solar farms. Additionally, solar thermal collectors, such as those developed by Catch Solar, can directly convert solar energy into heating for buildings. These collectors use solar thermal panels made of aluminium, which can replace conventional building materials for roofs and facades. This technology is highly adaptable, suitable for various structures, including private residences, commercial buildings, and agricultural facilities.
Thermoelectric generators (TEGs) are another crucial component of solar and thermal energy harvesting. TEGs consist of the junction of two dissimilar materials, typically semiconductors, with a thermal gradient between them. This setup allows for the generation of electrical voltage due to the temperature difference, causing electrons to move to the colder side and produce electricity. TEGs can capture energy from industrial equipment, structures, and even the human body, making them versatile energy sources.
Pyroelectric energy conversion is a promising method for harvesting thermal energy. Pyroelectric materials, such as polyvinylidene fluoride trifluoroethylene polymers and lead lanthanum zirconate titanate ceramics, can efficiently generate large energy densities at low temperatures. The Olsen cycle, which involves charging and discharging a capacitor under specific temperature and electric field conditions, is a key principle in pyroelectric energy conversion. This process enables the direct conversion of waste heat into electricity, improving thermodynamic efficiency.
The advantages of solar and thermal energy harvesting extend beyond environmental benefits. By utilising locally available solar energy, energy loss during transmission over long distances is significantly reduced. Additionally, solar thermal collectors can provide cooling in hotter climates when combined with adsorption cooling technologies. These applications contribute to the overall sustainability and resilience of the energy system, aligning with the European Commission's 2030 Energy and Climate Package, which aims to promote renewable energy sources and reduce pollutant gas emissions.
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Telecommunication applications
Infrared light, being a form of electromagnetic radiation, is an essential component of modern telecommunication systems. The ability to convert infrared light into electricity enables the transmission of information over long distances through fibre optic cables. This is achieved by using lasers or light-emitting diodes (LEDs) to transmit data as pulses of infrared light through these cables. At the receiving end, photodetectors convert the infrared light back into electrical signals, allowing information to be relayed over vast distances with minimal loss of data integrity.
The recent discovery of a novel material, scandium nitride, has revolutionized the potential for infrared applications in telecommunications. Researchers from the University of Sydney and the Indian Institute of Science have demonstrated that this material can efficiently emit, detect, and modulate infrared light. This capability is crucial for optical communication devices, as it enables the conversion of electrical signals carrying data into infrared light for transmission and then back into electrical signals for reception.
Scandium nitride's compatibility with complementary metal-oxide-semiconductor (CMOS) technology further enhances its potential in telecommunication applications. This compatibility means that scandium nitride can be easily integrated into existing semiconductor technologies, making it ideal for on-chip optical communication devices. By combining infrared light conversion with CMOS compatibility, scandium nitride can facilitate the development of more efficient and compact telecommunication systems.
Additionally, the use of infrared light in telecommunication applications extends beyond data transmission. Infrared light is also employed in remote control systems, where infrared signals are transmitted from a remote control device to a receiver, such as a television or audio equipment. The ability to convert these infrared signals into electrical impulses allows the receiver to interpret and respond to the commands issued by the remote control, enabling wireless control of various electronic devices.
In conclusion, the conversion of infrared light to electricity plays a pivotal role in telecommunication applications. From long-distance data transmission through fibre optics to remote control systems, the efficient manipulation of infrared light has become essential. With ongoing advancements in materials like scandium nitride, we can expect further innovations and improvements in the way we transmit and receive information using infrared technology.
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Defence and security technologies
Infrared radiation, though invisible, can be felt as heat by humans and is a key component of night-vision goggles. Scientists have been working on ways to harness this energy for defence and security applications, and a recent breakthrough has been made with the discovery of a new material. This novel substance, termed "single-crystalline scandium nitride", can efficiently emit, detect, and modulate infrared light, making it useful for defence technologies.
The material, discovered by scientists at the Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR) in Bengaluru, India, is compatible with modern CMOS or Si-chip technology. This compatibility means it can be easily integrated with on-chip optical communication devices, which are essential for defence and security systems. By manipulating electromagnetic waves, these devices can be used for secure telecommunication and data transmission.
Additionally, the phenomenon of polariton excitations has been utilized to convert infrared light into renewable energy. Polariton excitations occur when light interacts with either the collective free electron oscillations or polar lattice vibrations in tailored materials. This process enables strong light-matter interactions and the creation of exotic polaritons in scandium nitride. These polaritons have potential applications in defence and security technologies, such as infrared sensors and emitters, enhancing surveillance and detection capabilities.
The demand for infrared sources, emitters, and sensors in defence and security is significant, and these advancements in converting infrared light to electricity offer promising solutions. Further research and development will likely lead to more efficient and integrated defence systems, improving national security and protection.
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Sensors and healthcare services
Infrared sensors are a blend of physics and technology, serving as a cornerstone in numerous sectors. They have a wide variety of applications due to their ability to detect heat and movement. Infrared radiation is invisible to humans; it is a component of the electromagnetic spectrum with a wavelength longer than visible light, which makes it invisible to the human eye. However, infrared sensors are designed to specifically detect this radiation and convert it into an electrical signal for interpretation or processing.
Passive Infrared Sensors (PIR) absorb the radiated heat of objects in their field of view and are used in security systems, automated lighting systems, and automatic doors. Active Infrared Sensors (AIR), on the other hand, emit infrared signals and work based on the principle of reflection.
Infrared sensors have applications in autonomous vehicles, IoT devices, wearable technology, and environmental monitoring. In self-driving vehicles, they help detect obstacles and other road users, enhancing safety. For IoT and wearable technology, infrared sensors monitor body temperature and heart rate, offering real-time health tracking. Additionally, they assist in environmental studies and weather forecasting by tracking vegetation growth, measuring soil moisture, and monitoring climate change through surface temperature evaluation.
The demand for infrared sensors in various sectors, including healthcare, is high. Recent research has led to the discovery of a novel material, single-crystalline scandium nitride, which can efficiently emit, detect, and modulate infrared light. This material holds promise for applications in solar and thermal energy harvesting, optical communication devices, and healthcare services.
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Frequently asked questions
The thermoradiative process involves diverting energy flowing in the infrared from a warm body to a colder environment. This temperature difference is what allows electricity to be generated.
Researchers have discovered a novel material called single-crystalline scandium nitride (ScN) that can emit, detect, and modulate infrared light with high efficiency.
A device that uses a power-generation tool called a thermo-radiative diode has been tested to convert infrared heat into electricity. This technology is similar to that used in night-vision goggles.
Converting infrared light to electricity can be used for solar and thermal energy harvesting, telecommunication, defence and security technologies, sensors, and healthcare services.
