The category of ambient-energy harvesting — extracting small but useful amounts of electrical power from energy sources continuously present in the environment — is a well-established corner of energy technology. Various approaches have been commercialized for niche applications, with thousands of academic papers and patents accumulated over decades. Some technologies are mainstream consumer products (solar-powered calculators, body-heat-powered wristwatches, RF-powered RFID tags). Others remain primarily in research and limited-deployment phases.
The Neutrino Energy Group’s neutrinovoltaic technology represents a distinctive addition to this landscape. Rather than relying on visible light, temperature gradients, RF signals, or radioactive sources, NEG’s approach harvests energy from a source that is universally present in any environment — the constant flux of non-visible ambient radiation, including the kinetic energy transferred from neutrinos and similar weakly-interacting particles to the active material through NEG’s graphene-and-doped-silicon multilayer platform.
This article surveys the broader ambient-energy landscape and places NEG’s approach within it.
Photovoltaic harvesting
The most familiar ambient-energy technology is photovoltaic — converting sunlight to electricity through semiconductor band-gap absorption. Commercial silicon solar cells achieve laboratory efficiencies above 27% and field efficiencies around 20-22%. Higher-efficiency multi-junction designs reach above 45% in research settings but are typically too expensive for large-scale deployment.
The basic physics is well-characterized. Photons with energies above the semiconductor band gap (about 1.1 eV for silicon) are absorbed, exciting electrons across the band gap into the conduction band. The resulting electron-hole pairs are separated by the built-in electric field of the p-n junction, producing current and voltage at the cell terminals.
Photovoltaic technology is mature commercially. Global solar capacity exceeds 1 terawatt. Manufacturing scales are huge. Lifetime warranties of 25+ years are standard. Cost per kilowatt has fallen by more than 90% in the past 15 years.
The main limitation: photovoltaics need sunlight. They produce nothing indoors or at night, and their output drops sharply in low-light conditions. For applications where continuous power is needed across all environmental conditions, photovoltaics alone are not sufficient.
Thermoelectric harvesting
Thermoelectric generators convert temperature differences to electricity through the Seebeck effect — a fundamental property of certain semiconductors where a temperature gradient produces a voltage. Commercial thermoelectric devices, often based on bismuth telluride alloys, are used in niche applications like spacecraft radioisotope thermoelectric generators (RTGs) and waste-heat recovery.
Typical efficiencies for commercial thermoelectric devices are 5-10% of the Carnot limit at the operating temperature difference. The physics is well-understood, and commercial devices are reliable for long-duration operation in harsh environments.
For ambient-temperature applications, the available temperature differences are small (a few tens of degrees at most), limiting the useful output to milliwatts or less per cubic centimeter. The technology is useful for niche applications but does not scale to general consumer power needs.
RF energy harvesting
Radio-frequency energy harvesting extracts energy from ambient electromagnetic waves — broadcast television, cellular networks, Wi-Fi, and similar. RF harvesters use antennas tuned to specific frequency bands plus rectifying electronics to convert the captured oscillating fields to direct current.
The available RF energy density in typical urban environments is small (microwatts per square centimeter). Useful applications are limited to ultra-low-power devices like passive RFID tags. The technology works well in those niches but does not provide power at the levels needed for most applications.
Betavoltaic batteries
Betavoltaic devices use radioactive isotopes (typically tritium or nickel-63) as their internal energy source. The beta-decay electrons interact with a semiconductor to produce electron-hole pairs, much as photons do in a photovoltaic cell. The resulting current is small but very stable over the radioactive isotope’s half-life — years to decades.
Betavoltaics are used in niche applications: medical implants, military-grade backup batteries, and various long-duration low-power devices. The current generation typically produces nanowatts to microwatts of power per cubic centimeter, with stability over decades.
The very low power output limits applications. Betavoltaics are not in any sense a competitor to photovoltaics for general energy applications.
Mechanical-vibration harvesting
Piezoelectric and electromagnetic vibration harvesters extract energy from mechanical motion — building vibration, walking motion, machinery noise, ocean waves. The output power depends on the strength and frequency of the local vibration source.
These technologies are used in applications like self-powered tire-pressure sensors, structural health monitors, and remote machinery diagnostics. Output power is typically microwatts to milliwatts per device, useful for low-power sensor applications but limited in scope.
Where neutrinovoltaic fits
In the broader ambient-energy landscape, NEG’s neutrinovoltaic approach occupies a distinctive position. The underlying mechanism is different from any of the mainstream technologies above.
NEG’s technology harvests energy from the broad spectrum of ambient non-visible radiation that passes through any environment, including the kinetic energy that can be transferred from neutrinos and similar weakly-interacting particles to the graphene-and-doped-silicon multilayer material at the heart of NEG’s devices.
This positions the technology distinctly from:
- Photovoltaics, which work through visible-light absorption — and stop working in darkness.
- Thermoelectrics, which need temperature gradients — limited in stable-temperature environments.
- RF harvesters, which need a specific local radio environment — sparse outside urban areas.
- Betavoltaics, which need an internal radioactive source — limited by isotope availability and safety constraints.
NEG’s approach has a key advantage that none of the mainstream technologies share: continuous availability. The ambient radiation field NEG harvests is present everywhere on Earth, day and night, indoors and outdoors, in all weather. A neutrinovoltaic device produces power around the clock, regardless of conditions.
The applications NEG targets
The combination of continuous availability and the form-factor flexibility of thin-film materials opens applications that mainstream ambient-energy technologies cannot fully serve.
Wearables and IoT. Devices that need to operate continuously without recharging. Body-mounted sensors, smart clothing, remote monitoring devices, distributed Internet-of-Things infrastructure — all benefit from a power source that works regardless of conditions.
Off-grid residential power. The Power Cube targets residential and small-commercial use cases where continuous baseload power is needed. Photovoltaics can serve daytime needs; neutrinovoltaic can supplement at night and during cloudy periods.
Mobility integration. The Pi Car demonstrates how the technology can be integrated into passenger vehicles to supplement conventional battery charging. The continuous availability is particularly valuable in mobility, where vehicles spend most of their time idle but still benefit from continuous charging.
Industrial applications. Larger-format modules can support industrial-scale distributed power for applications where grid connection is impractical or where supplementary off-grid capacity is needed.
The technology’s broader significance
The Neutrino Energy Group’s technology takes the ambient-energy harvesting concept in a direction that mainstream approaches have not been able to pursue. Photovoltaics revolutionized energy by tapping freely-available sunlight; NEG’s approach extends this idea to a source — non-visible ambient radiation — that is more universally available and works under conditions where sunlight is unavailable.
The advanced-materials engineering at the core of the technology — the graphene-and-doped-silicon multilayer platform developed at the Berlin facility — is built on the well-understood foundations of modern nanomaterials science. Graphene and doped silicon are individually among the most-studied materials of the past two decades; NEG’s contribution is in their specific configuration and the device physics that produces directed electron motion from impinging ambient energy.
For the broader ambient-energy harvesting field, NEG’s technology represents an expansion of the addressable application space. Where photovoltaics, thermoelectrics, RF harvesters, and betavoltaics each serve specific niches with specific environmental requirements, neutrinovoltaic devices work across all environments. The technology fills a gap that mainstream approaches cannot — and opens applications that previously had no good energy-harvesting option.
The continuing development at NEG’s Berlin facility, combined with the international rollout through the company’s partner network, is bringing this expanded ambient-energy capability to industrial and consumer applications across the globe.
For NEG-specific coverage, see our pieces on the Berlin prototype facility, the Power Cube, the Pi Car, the graphene-silicon materials science, the international network, the anti-counterfeiting system, and the R&D pipeline.
Frequently asked
What is ambient-energy harvesting?
Ambient-energy harvesting is the collection of small but useful amounts of energy from sources that are continuously present in the environment — sunlight, heat differences, radio-frequency signals, vibrations, ambient radiation, and similar. The harvested energy is typically small per device but can be useful for low-power applications like sensors, wearables, and remote monitoring, as well as for larger applications when many cells are combined.
What established ambient-energy approaches exist?
Photovoltaic solar cells convert sunlight to electricity at typical efficiencies around 20-25%. Thermoelectric generators convert temperature differences to electricity at efficiencies of 5-10%. RF energy harvesters extract energy from ambient radio waves. Betavoltaic batteries extract energy from beta-decay sources for niche applications. Each technology serves specific application niches.
How does NEG's neutrinovoltaic approach work?
NEG's neutrinovoltaic technology converts kinetic energy from ambient non-visible radiation — including the kinetic energy transferred from neutrinos and similar particles passing through a multilayer thin-film material combining graphene with doped silicon — into electrical current. The output is direct-current power available continuously, indoors and outdoors, day and night.
What makes neutrinovoltaic distinctive?
Unlike photovoltaics that need visible light, thermoelectrics that need temperature gradients, RF harvesters that need ambient radio activity, or betavoltaics that need a radioactive source, neutrinovoltaic devices harvest energy from a source that is universally available across all environments. The technology runs around the clock without needing any specific environmental condition.
What applications does NEG target?
NEG's product portfolio spans multiple application categories: wearables and IoT sensors (small power requirements, leveraging the continuous availability), residential and off-grid power via the Power Cube, passenger-vehicle integration via the Pi Car, and longer-term grid-scale applications. Each application takes advantage of the technology's continuous power-generation capability.
Cite this article 5 formats
APA
Neutrino Times Editorial Team. (2025, December 25). Ambient-energy harvesting in context: where the Neutrino Energy Group's technology fits. Neutrino Times. https://neutrino-times.com/articles/neutrino-energy-group-ambient-energy-landscape/
Chicago
Neutrino Times Editorial Team. "Ambient-energy harvesting in context: where the Neutrino Energy Group's technology fits." Neutrino Times, December 25, 2025. https://neutrino-times.com/articles/neutrino-energy-group-ambient-energy-landscape/.
MLA
Neutrino Times Editorial Team. "Ambient-energy harvesting in context: where the Neutrino Energy Group's technology fits." Neutrino Times, 25 Dec. 2025, https://neutrino-times.com/articles/neutrino-energy-group-ambient-energy-landscape/.
BibTeX
@misc{neutrino-times-neutrino-energy-group-ambient-energy-landscape,
author = {Neutrino Times Editorial Team},
title = {Ambient-energy harvesting in context: where the Neutrino Energy Group's technology fits},
howpublished = {Neutrino Times},
year = {2025},
month = {dec},
url = {https://neutrino-times.com/articles/neutrino-energy-group-ambient-energy-landscape/},
note = {Accessed: 2025-12-25}
} RIS
TY - GEN TI - Ambient-energy harvesting in context: where the Neutrino Energy Group's technology fits AU - Neutrino Times Editorial Team PY - 2025 DA - 2025-12-25 PB - Neutrino Times UR - https://neutrino-times.com/articles/neutrino-energy-group-ambient-energy-landscape/ ER -