Key takeaways
- RadianX secured $5 million in seed funding from SOSV and Twynam to commercialize perovskite solar panels that double indoor light-harvesting efficiency compared to traditional silicon panels.
- The startup plans to sell integrated power systems directly to device manufacturers, not bare panels, positioning itself as the complete solution provider between component makers and customers.
- Perovskite efficiency improvements could enable previously impractical applications: e-readers, IoT sensors, robots and wearables that charge continuously without battery replacement.
- Perovskite solar technology has failed to reach commercial viability multiple times over the past decade; RadianX faces significant execution risk in manufacturing and market adoption.
RadianX, a startup developing solar technology, has raised $5 million in a seed round to commercialize panels made from perovskites, a material class that can harvest light indoors at roughly double the efficiency of traditional silicon solar panels.
The round was led by venture capital firms SOSV and Twynam. Investors also included One Small Planet, Sachsen Ventures, Avila VC, California Innovation Fund, quantumEDGE, Riceberg Ventures, and Alumni Ventures. Manufacturing company Pacific Union Technology Precision Manufacturing is providing an additional $4 million in non-dilutive funding to build a dedicated production line.
The goal is to enable what the company calls “edge energy,” where devices from e-readers to IoT sensors operate continuously powered by ambient light rather than relying on batteries. Larger systems like robots and wearables could also benefit from extended runtimes, according to the startup.
What Makes Perovskites Different
Perovskites are not new. The material class has existed for years, but commercial adoption has stalled due to higher costs compared to silicon panels and durability concerns. Recent improvements in the material’s longevity have reduced these barriers, opening new possibilities.
Indoor Efficiency Advantage
RadianX’s version performs as well as conventional solar panels in outdoor conditions but delivers roughly double the power harvesting in indoor lighting environments. This asymmetry stems from how perovskites interact with different light spectrums. Vivian Qu, the startup’s CEO, emphasized power density as the critical factor. “The reason why perovskites have been so interesting is the high power density,” she told TechCrunch.
Record-Setting Performance Metrics
The company’s 1.2-meter-by-0.6-meter test panel achieves 22.33% efficiency in light harvesting, a figure RadianX claims is the best recorded for this material. The panels can be manufactured as thin as 0.7 millimeters, allowing flexible integration into device designs without adding bulk.
Addressing Traditional Durability Concerns
While perovskites remain less durable than silicon under certain conditions, RadianX has met established industry durability standards. Indoor-focused applications reduce wear-and-tear compared to outdoor exposure, partially mitigating this historical weakness.
Engineering for a Different Material
Beyond the solar cells themselves, the startup is developing power management electronics specifically tuned to perovskites. Most existing power electronics are optimized for silicon panels, which have distinct electrical characteristics. “Silicon has a very different light soaking characteristic,” Qu noted, explaining why generic solutions fall short.
This customization represents a departure from how many solar startups operate. The approach aims to simplify adoption for device manufacturers by offering complete integrated systems rather than raw components.
The Path to Commercialization
Manufacturing Scale and Investment
The funding enables RadianX to move beyond laboratory prototypes toward mass production. Pacific Union’s $4 million investment in dedicated manufacturing capacity signals confidence in the technology’s viability at scale. The company is not building its own foundry but partnering with an existing manufacturer to avoid massive capital expenditure.
A Strategy Centered on Integration
Unlike many solar technology companies, RadianX plans to position itself between panel manufacturers and device makers. Rather than selling standalone panels to end-customers or assembling systems for retail, the startup will offer integrated power packages directly to device manufacturers. As Qu explained, “RadianX is trying to package all of this and sell this to device makers as something they don’t need to worry about.”
This approach reduces friction for adoption and allows the startup to control the complete power delivery chain, from the perovskite cell to the charging logic.
A Category Overlooked for Decades
The Solar Calculator Precedent
Solar-powered calculators proved decades ago that indoor light could sustain consumer electronics. This concept faded as modern devices demanded vastly more power than early calculators consumed. Modern smartphones and tablets drain batteries far faster than traditional solar could replenish them, making solar a peripheral feature rather than a primary power source.
The fundamental gap has always been power density, the amount of energy extracted per unit area of panel. Traditional silicon panels simply could not generate enough current in indoor lighting to keep pace with modern device consumption.
Why Perovskites Shift the Equation
Perovskites’ superior indoor efficiency addresses this power density gap directly. An e-reader consumes far less power than a smartphone, making it an ideal candidate for continuous solar charging. Similarly, IoT sensors deployed in factories, offices, and smart homes operate in consistent indoor lighting and typically run minimal processing tasks, requiring only microwatts of power.
Potential Applications Beyond the Obvious
RadianX’s executives see opportunities extending well beyond the examples they have articulated. Josh Douglas, the startup’s co-founder and COO, noted that “unexpected uses could emerge, including long-runtime robots or wearables that have been held back by limited battery power.”
The common thread across potential applications is low power consumption and the value of eliminating maintenance. A sensor that never requires battery replacement reduces operational costs for fleet managers and facility operators. A wearable that charges continuously throughout the day removes an entire category of user frustration.
Timeline and Execution Risk
The startup has secured manufacturing partnerships and capital to build production capacity, but commercial availability timelines have not been announced. The path from prototype efficiency to reliable mass-market products typically spans multiple years, including validation testing, regulatory compliance where applicable, and supply chain establishment.
Perovskite solar technology has faced repeated setbacks in commercialization efforts over the past decade. RadianX’s execution will largely determine whether this attempt succeeds where others have faltered.
Source: TechCrunch
Frequently Asked Questions
How much more efficient are RadianX's perovskite panels at harvesting indoor light?
RadianX's perovskite panels harvest light indoors at roughly double the efficiency of traditional silicon solar panels. The company's 1.2-meter-by-0.6-meter test panel achieves 22.33% light-harvesting efficiency, which RadianX claims is the best recorded for this material.
Why hasn't perovskite solar technology reached the market before now?
Perovskites are more expensive than silicon solar panels and historically faced durability challenges, though recent years have brought significant improvements to the material. Higher cost and lower longevity compared to established silicon technology made early commercialization efforts too risky.
What is RadianX's business model?
RadianX will not sell bare solar panels to consumers. Instead, the startup plans to sell integrated power systems directly to device manufacturers, handling the entire chain from perovskite cells to power management electronics, eliminating integration work for customers.
