Caelux

What Caelux does

Caelux Corporation is a US-based perovskite solar technology company (founded 2014, headquartered in Pasadena, California) that develops and manufactures Perovskite Active Glass — a proprietary perovskite-coated front glass product that replaces the standard cover glass on silicon solar modules, enabling four-terminal (4T) hybrid tandem module architectures. The core technology converts visible and UV light in a perovskite layer while letting infrared light pass through to an underlying silicon cell (PERC, TOPCon, HJT, or BC), yielding up to ~6% absolute efficiency improvement at the module level and up to 28% conversion efficiency versus ~25% for conventional TOPCon; claimed outcomes include up to 30% more power per module, 20% lower installed cost, and 15% lower LCOE. The company also leverages a radiation self-healing perovskite effect (discovered with Caltech in 2018) for space and terrestrial applications.

Caelux operates a Tier 2 OEM-embedded business model: it manufactures Active Glass at a 50MW production line in Baldwin Park, California, and sells it on multi-year contracts to silicon solar module manufacturers (Rayzon Solar, Navitas Solar, Solx, and others via 11 MOUs) who integrate the glass into their existing production lines with minimal process changes. Revenue mechanics combine per-unit hardware sales (CaeluxPrime and CaeluxOne product tiers) with multi-year licensing/technology partnerships carrying GW-scale volume commitments (Rayzon 5 GW, Navitas 5 GW, Solx 3 GW = 13 GW total committed capacity targeting 2027-2028 commercial production). Manufacturing uses ML and computer vision for real-time defect detection and process optimization, and Caelux's US-domestic production qualifies modules for IRA ITC/PTC domestic-content bonuses plus a $0.04/W thin-film refundable tax credit through 2029.

The company has raised approximately $70 million in total funding, led by Temasek (Series A3 lead), Khosla Ventures, Reliance New Energy (20% strategic stake), Mitsui Fudosan, and Fine Structure Ventures. Caelux completed its first commercial Active Glass shipment in July 2025 and is led by CEO Scott Graybeal, CTO Charlie Hasselbrink, COO Jiunn Benjamin Heng, SVP Sales & Marketing Aaron Thurlow, and Managing Director India & Middle East Vish Iyer. Recognitions include TIME America's Top GreenTech Companies 2025, CleanTech Breakthrough Solar Technology Company of the Year, MIT Technology Review 10 Breakthrough Technologies 2024, and a 2023 BIG Green Company of the Year award.

Name

Caelux

Legal name

Caelux Corporation

Website

https://caelux.com

Company type

Private

Founded year

2014

Operating status

Operating

Headcount range

51–100 employees

Short description

Caelux Corporation manufactures proprietary perovskite-coated Active Glass that solar module makers integrate into existing silicon production lines to produce 4-terminal hybrid tandem modules delivering up to 28% efficiency, selling to module manufacturers in the US, India, and Puerto Rico.

Ownership category

akta.pro rank

Product category

Solar Module Components

NAICS

Flat Glass Manufacturing (327211)

SIC

Flat Glass (3211)

akta.pro primary industry

Solar PV Module & Cell Manufacturing (Crystalline, Thin-Film) (EUAMAHAA)

akta.pro secondary industries

Next-Gen Photovoltaics R&D (Perovskite, Tandem, Organic, BIPV Materials) (EUAMAOAA), Low‑E, Solar Control & Energy-Efficient Coated Glass (IMADAHAF)

Keywords

• Perovskite solar technology
• Hybrid tandem modules
• Perovskite active glass
• Solar module components
• Renewable energy manufacturing

Headquarters

HQ city

Pasadena

HQ country

United States

HQ region

North America

Offices4 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Technology or R&D, Personnel, Operations, Infrastructure, Marketing or Sales, Supply Chain

Revenue model

1. Perovskite Active Glass (Caelux One / Caelux Prime): Caelux manufactures and sells its proprietary perovskite-coated glass to solar module manufacturers. Module makers purchase Caelux Active Glass and integrate it into their existing silicon solar module production lines to create Hybrid-Tandem modules. Revenue is generated through product sales of glass panels on a per-unit basis.
2. Licensing and Technology Partnerships: Caelux enters multi-year commercial partnerships with module manufacturers (Rayzon Solar, Navitas Solar, Solx) granting technology access to use Caelux Active Glass in their module products, with defined production volumes (GW commitments) and commercial terms.

Pricing tiers

Go-to-market motion3 records

Distribution channels4 records

Marketing channels6 records

Core offering

Caelux manufactures and sells proprietary perovskite-coated Active Glass to solar module manufacturers as a drop-in replacement for the front glass of conventional silicon solar modules. The Active Glass acts as a second power-generating layer, enabling hybrid tandem modules that deliver up to 30% more power output and 6% absolute efficiency gains over conventional modules without requiring new capex from module makers.

Product overview

Caelux offers a portfolio of perovskite-based solar technology products that transform conventional silicon solar modules into high-efficiency hybrid tandem modules. The core product is Caelux Active Glass, a proprietary perovskite-coated glass that replaces the front glass in traditional silicon solar panels. Two main product tiers exist: CaeluxPrime (limited early-access with up to 3% absolute efficiency improvement) and CaeluxOne (flagship mainstream product with up to 6% absolute efficiency improvement). The products enable existing solar manufacturers to create Hybrid-Tandem modules with two power generation layers without major changes to their production lines. The technology delivers up to 30% more power generation capacity and 20% lower installed costs compared to conventional solar modules.

Differentiator

Problem solved

Functional benefit

Brands

• CaeluxPrime™: Limited and exclusively available to initial customers and partners, providing up to 3% absolute efficiency improvement over conventional solar modules.
• CaeluxOne™
• Active Glass

Products and services

• Caelux Active Glass
• CaeluxOne
• CaeluxPrime
• Hybrid Tandem Solar Modules

Quantifiable outcome

• Up to 30% more power generation capacity per solar panel
• +7 more outcomes

Named customers3 records

Segments2 records

Ideal customer profiles2 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

AI capability4 records

Feature5 records

Partnerships

Ten partnerships are on record, tiered flagship, secondary and minor.

• Rayzon SolarflagshipStrategic or Co-development Partner · 23 July 2026Rayzon Solar and Caelux signed a five-year, 5 GW partnership to integrate Caelux's perovskite solar glass with Rayzon Solar's TOPCon modules, producing hybrid tandem modules with efficiencies of 28%. The partnership leverages Rayzon Solar's 11.3 GW manufacturing facilities in Surat, Gujarat, with commercial volumes expected by 2028 for India's government-tendered utility market. Supports India's 'Make in India' vision and clean energy goal of 500 GW by 2030.
• Navitas SolarflagshipStrategic or Co-development Partner · 23 July 2026Navitas Solar and Caelux entered a five-year, 5 GW partnership to produce hybrid tandem solar modules combining perovskite and silicon technologies with efficiencies reaching up to 28%. Commercial production targeted for 2028 and will meet India's Approved List of Module Manufacturers (ALMM) requirements. Supports India's target of 500 GW renewable energy by 2030.
• CuspAIsecondaryTechnology or Integration · 20 July 2026Caelux joined CuspAI's AI Materials Foundry as a founding partner — a global network of more than 45 partner organizations combining expertise in AI, compute infrastructure, and domain knowledge to discover novel materials for semiconductors, clean energy, and advanced manufacturing. Caelux contributes perovskite solar cell domain expertise to the network.
• SolxflagshipStrategic or Co-development Partner · 21 April 2026Solx and Caelux announced a five-year, 3 GW strategic partnership to commercialize ultra-high efficiency hybrid tandem solar modules using Caelux's Active Glass technology integrated into Solx's Aurora platform, achieving 28% efficiency. US production is already underway with beta modules deployed in a domestic project. Suniva supplies US-made monocrystalline silicon solar cells. Commercial volumes expected 2027.
• SunivasecondaryTechnology or Integration · 21 April 2026Suniva supplies US-made monocrystalline silicon solar cells as the second power layer for Solx's Aurora modules under the Caelux-Solx partnership. Suniva is building a 4.5 GW manufacturing facility in Laurens, South Carolina to support the domestic solar supply chain.
• University of New South Wales (UNSW)minorStrategic or Co-development Partner · 23 September 2022Caelux partnered with UNSW's ACDC Research Group on a solar research project to advance perovskite technology development and reliability testing.
• US-MAP (U.S. Manufacturing for Advanced Perovskites)secondaryTechnology or Integration · 1 September 2021Caelux was invited to join the Industry Advisory Board for the US-MAP consortium, a public-private effort involving NREL, laboratories, universities, and private industry. The consortium seeks to accelerate perovskite R&D, development, and manufacturing to reduce costs and minimize investor risks. Caelux co-leads the US-MAP working group on perovskite circular supply chain.
• SEMA Coalition (Solar Energy Manufacturing for America)secondaryOthers · 1 August 2021Caelux joined the SEMA coalition led by Boundary Stone Partners, supporting Senator Ossoff's bill (S.2140) to provide domestic solar supply manufacturing tax credits. Caelux actively advocated for thin-film PV provisions in the Inflation Reduction Act, which incorporated a $0.04/watt refundable tax credit for Caelux through 2029.
• Innovate PasadenaminorOthers · 1 July 2021Caelux joined Innovate Pasadena to facilitate collaboration across business, academia, and the broader community. The organization connects local companies with representatives from Pasadena City Council, Idealab, Art Center, Caltech, and Pasadena City College.
• CaltechsecondaryStrategic or Co-development PartnerCaelux partnered with Caltech to discover the self-healing phenomenon in perovskite cells (2018). The partnership continues with deployment of Caelux perovskite solar cells in space as part of Caltech's ALBA project. Caelux is also a spinout from Caltech.

Scale indicators10 records

Recent moves6 records

Expansion highlights7 records

Direct peers

• Oxford PV: Oxford PV is developing perovskite-silicon tandem solar cells and modules and is widely considered the most advanced commercial perovskite tandem player. Both companies pursue perovskite-on-silicon tandem architectures to boost silicon module efficiency.
• Swift Solar: Swift Solar is a US-based perovskite tandem startup developing lightweight, high-efficiency perovskite-silicon tandem modules. It is a direct technology peer to Caelux, listed alongside Caelux in MIT Tech Review's 2024 10 Breakthrough Technologies for super-efficient solar cells.
• Tandem PV: Tandem PV is a perovskite-silicon tandem cell developer focused on commercial-scale tandem modules. It is a direct competitor in next-gen tandem technology, listed alongside Caelux in MIT Tech Review's 2024 breakthrough list.

Broad incumbents

• First Solar: First Solar is the largest US-headquartered thin-film solar manufacturer (CdTe technology) with GW-scale operations. It is a broad incumbent in the thin-film solar space and competes indirectly with Caelux for module-maker mindshare and utility-scale project wins.
• Hanwha Q Cells: Hanwha Q Cells is one of the world's largest silicon solar module manufacturers with significant R&D into tandem and high-efficiency cell technologies. It was named alongside Caelux in MIT Tech Review's 2024 breakthrough list and represents the incumbent silicon module ecosystem Caelux targets.
• LONGi Green Energy: LONGi is the world's largest silicon wafer and module manufacturer and a major player in TOPCon and HJT cell technologies. As Caelux's SVP previously worked at LONGi, it is a key incumbent benchmark and potential competitor in tandem development.
• Trina Solar: Trina Solar is a top-tier global silicon module manufacturer actively developing TOPCon and tandem cell technologies. It is a relevant incumbent peer competing for the same silicon module manufacturer upgrade pipeline that Caelux targets.
• JA Solar: JA Solar is one of the largest global solar module manufacturers with TOPCon and next-gen cell development programs. As a broad incumbent, it competes for the same module-maker partnerships and downstream utility-scale customers as Caelux.

Emerging players

• Suniva: Suniva is a US-based monocrystalline silicon solar cell manufacturer building a 4.5 GW facility in South Carolina. It supplies US-made silicon cells for the Solx-Caelux partnership and represents an emerging US-domiciled solar player in the same domestic-content ecosystem.

Others

• Rayzon Solar: Rayzon Solar is an India-based solar module manufacturer operating 11.3 GW of TOPCon capacity in Surat, Gujarat. It is one of Caelux's three flagship 5 GW Active Glass integration partners and a key channel to the Indian ALMM market.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat6 records

Key risks6 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/caelux-corporation
• Xx.com/CaeluxCorp

Revenue estimate

Valuation estimate

Number of profiles

Profiles6 records

Funding overview

Funding rounds3 records

Investors6 records

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Caelux