Photovoltaic Solar Patents

Photovoltaic solar PV patents cover silicon cell efficiency innovations including PERC, HJT, TOPCon, and IBC; thin-film CdTe and CIGS solar cell innovations; perovskite solar cell and perovskite-silicon tandem innovations; module-level innovations including bifacial, encapsulation, and anti-reflection coatings; and solar module and system innovations including microinverters and trackers — with IP held by leading silicon manufacturers, thin-film specialists, and perovskite startups: MAJOR SOLAR PATENT HOLDERS: FIRST SOLAR: 1,000+; specific CdTe thin film (specific specific CdTe module: specific specific vapor transport deposition VTD from specific specific close-spaced sublimation CSS from specific specific 3 μm CdTe absorber from specific specific CdCl₂ vapor anneal from specific specific 600°C 10 min from specific specific ZnTe+Cu back contact from specific specific CdSe 1.0 eV heterojunction from specific specific series-connected scribe P1/P2/P3 laser scribing from specific specific 25.0% commercial module from specific specific 29.1% record cell from specific specific 5% Cd weight vs. specific specific 10× Si silicon); LONGi GREEN ENERGY: 2,000+; specific TOPCon (specific specific n-TOPCon: specific specific n-type FZ Cz Si substrate from specific specific tunnel SiO₂ 1.4-1.6 nm from specific specific n+ poly-Si 200 nm LPCVD at specific specific 630°C from specific specific phosphorus-doped polysilicon from specific specific LECO laser-enhanced contact optimization from specific specific 200 nm Cu+Ag metallization from specific specific Al₂O₃+SiNx passivation front at specific specific 25.4% record large-area 210 mm G12 from specific specific GW+ production); OXFORD PV: 200+; specific perovskite tandem (specific specific Si-perovskite 2T tandem: specific specific monolithic from specific specific Si HIT bottom cell from specific specific perovskite ABX₃ top cell MAPbI₃ at specific specific Cs₀.₀₅FA₀.₈₁MA₀.₁₄PbI₂.₅₅Br₀.₄₅ from specific specific 1.68+1.12 eV dual bandgap from specific specific 29.52% certified from specific specific >40% theoretical SQ limit for specific specific two-junction from specific specific anti-reflection ARC layer from specific specific SnO₂ electron transport from specific specific NiO₊ hole transport for specific specific >1,000h stability 85°C 85% RH IEC 61215); PANASONIC (SANYO HIT): 500+; specific HJT (specific specific HJT HIT heterojunction: specific specific i/n a-Si:H intrinsic+n-doped amorphous Si from specific specific 5-15 nm from specific specific n-Cz Si wafer from specific specific bifacial from specific specific ITO transparent electrode from specific specific Cu-plated busbar from specific specific 26.81% record from specific specific Voc 0.750 V for specific specific 180 μm thin Si); HANWHA Q CELLS; SUNPOWER/MAXEON; JINKO SOLAR; TONGWEI; TRINA SOLAR.

PERC passivated emitter rear cell innovations for rear surface passivation and light management; HJT heterojunction solar cell innovations for high Voc and bifacial performance; and TOPCon tunnel-oxide passivated contact innovations for n-type silicon represent three core silicon solar cell patent domains: PERC SOLAR CELL PATENTS: UNSW AUSTRALIA BLAKERS; FRAUNHOFER ISE; HANWHA Q CELLS; JINKO; LONGi: specific PERC (specific specific PERC+ Al₂O₃ passivation: specific specific PECVD Al₂O₃ 10 nm at specific specific 200°C from specific specific SiNx cap 80 nm from specific specific ALD atomic layer deposition TMA+H₂O alternative at specific specific 1 Å/cycle from specific specific local laser-fired contact LFC at specific specific 50-80 μm spot size from specific specific 0.1-1 Hz repetition from specific specific Al paste screen print → from specific specific laser fire Al-Si alloyed local contact at specific specific 23.0% PERC single-side from specific specific 23.4% PERC bifacial rear 2R at specific specific bifi factor 70-80% for specific specific bifacial module ground-mount); HJT SOLAR CELL PATENTS: PANASONIC SANYO; CANADIAN SOLAR; HEVEL SOLAR; MEYER BURGER; REC SOLAR: specific HJT innovations (specific specific Perc/PERC+HJT hybrid: specific specific a-Si:H i-layer 5-10 nm PECVD at specific specific 200°C from specific specific Voc recombination J0 <10 fA/cm² from specific specific FJ fill factor 84% from specific specific TCO ITO 80 nm from specific specific Cu electroplating vs. specific specific Ag paste for specific specific 50% lower silver from specific specific temperature coefficient Pmax -0.25%/°C vs. specific specific -0.45%/°C PERC for specific specific hot climate advantage from specific specific bifacial factor 90-95% from specific specific 26.81% record Panasonic from specific specific 26.0-26.5% production target); TOPCON SOLAR CELL PATENTS: LONGi; JINKO; TONGWEI; FRAUNHOFER; HANWHA; JOLYWOOD: specific TOPCon (specific specific TOPCon poly-Si passivation: specific specific SiO₂ tunnel oxide 1.4-2.0 nm from specific specific LPCVD n+ poly-Si 200-300 nm at specific specific 560-650°C from specific specific POCl₃ phosphorus diffusion from specific specific Al₂O₃+SiNx front ARC+passivation from specific specific >26.0% PERC replacement for specific specific 2025 mainstream from specific specific LECO 200nm Cu LFC from specific specific passivation contact resistance <2 mΩ·cm² from specific specific 25.4% LONGi record 210mm); IBC SOLAR CELL PATENTS: SUNPOWER/MAXEON; FRAUNHOFER; ANU AUSTRALIA; IMEC: specific IBC innovations (specific specific IBC: specific specific all back contact from specific specific interdigitated p/n from specific specific n+ FSF front surface field from specific specific p+ BSF from specific specific Al₂O₃+SiNx passivation from specific specific 26.1% SunPower from specific specific 26.7% ISFH+IMEC record from specific specific FZ Si 160 μm wafer from specific specific <1 Ω·cm base from specific specific no shading front busbar loss from specific specific screen print+laser ablation from specific specific 600°C peak annealing from specific specific bifacial IBC = HBC hybrid-IBC+HJT >27.1% potential).

Perovskite solar cell stability and scalable deposition innovations; agrivoltaics dual land-use solar innovations; and concentrated solar power CSP with thermal energy storage innovations represent three additional solar patent domains: PEROVSKITE SOLAR PATENTS: OXFORD PV; SAULE TECHNOLOGIES; EPFL/ECOLE POLYTECHNIQUE; TANDEM PV; TRINA; IMEC: specific perovskite innovations (specific specific methylammonium-free perovskite: specific specific FA₀.₈₃Cs₀.₁₇Pb(I₀.₈Br₀.₂)₃ from specific specific formamidinium cesium mixed cation from specific specific bandgap 1.65 eV top cell from specific specific 2D/3D graded heterostructure from specific specific phenethylammonium PEA passivation at specific specific grain boundaries from specific specific 24.9% 1 cm² vs. specific specific 29.52% tandem from specific specific 1,000h 85°C damp-heat stability from specific specific CsSn₀.₅Pb₀.₅I₃ Pb-reduced variant; specific specific large-area perovskite deposition: specific specific blade coating slot-die coating from specific specific 0.3-0.5 m/min deposition rate from specific specific MAPbI₃ precursor solution from specific specific DMF:DMSO 4:1 from specific specific anti-solvent drip diethyl ether from specific specific 140°C anneal from specific specific 1×1 cm² → specific specific 5×5 cm² demonstration at specific specific 21.4% efficiency for specific specific R2R roll-to-roll flexible substrate PET from specific specific 15.3% flexible); AGRIVOLTAICS PATENTS: FRAUNHOFER ISE; FIRST SOLAR; SUNPOWER; TESLA ENERGY; NEXTRACKER: specific agrivoltaics (specific specific bifacial elevated agrivoltaic: specific specific bifacial panel at specific specific 4 m elevation from specific specific 30-45° tilt at specific specific 10 m pitch from specific specific partial shade 50-80% solar resource for specific specific shade-tolerant crops lettuce+cabbage+strawberry from specific specific 50-70% global solar input for specific specific crop+power from specific specific dual land-use from specific specific LER land equivalent ratio >1.3 from specific specific measured crop yield -20% + specific specific electricity generation 1 MW/ha from specific specific combination >1.3× single land use for specific specific agriculture+energy from specific specific semi-transparent BIPV from specific specific 15-20% transmission); CONCENTRATED SOLAR POWER PATENTS: BRIGHTSOURCE; HELIOGEN; SANDIA; ABENGOA; SIEMENS ENERGY: specific CSP innovations (specific specific Heliogen AI-controlled heliostat: specific specific 100+ mirror heliostat from specific specific dual-axis tracking from specific specific computer vision AI from specific specific camera feedback from specific specific 1,000°C+concentration target at specific specific 1,400 suns from specific specific steam H₂O electrolysis from specific specific >1,000°C direct heat from specific specific industrial cement+steel+hydrogen decarbonization from specific specific silicon SiO₂ thermal storage ΔHfusion 1,414°C at specific specific 1.79 MJ/kg at specific specific $20/kWh seasonal from specific specific 100+ MWh LTES from specific specific Antora Energy+Malta thermal).

Solar PV startup IP strategy must recognize that the dominant silicon solar cell technologies (PERC, TOPCon, HJT) are manufactured primarily by Chinese companies (LONGi, Jinko, Tongwei, Trina, JA Solar) with large patent portfolios and very low production costs; identify genuine IP whitespace in perovskite-silicon tandem, next-generation deposition methods, and novel module or system innovations; and appreciate that manufacturing scale and cost structure is often a more powerful competitive advantage than patent protection in commodity solar: SOLAR PV STARTUP IP STRATEGY: UNDERSTAND THE SOLAR IP LANDSCAPE: CHINESE SOLAR MANUFACTURERS DOMINATE SILICON CELL IP: LONGi (2,000+), Jinko (1,000+), Tongwei, Trina, JA Solar collectively hold the largest portfolios for PERC and TOPCon manufacturing process IP — the commodity silicon solar cell space is dominated by Chinese manufacturing scale and cost, making IP-only strategies uncompetitive without manufacturing cost differentiation; FIRST SOLAR HOLDS CdTe THIN-FILM COMPETITIVE MOAT: First Solar (1,000+) holds the most defensible thin-film solar IP in the US — CdTe VTD deposition technology, scribing patterns, and module reliability IP are core to their manufacturing moat in the US market; SUNPOWER/MAXEON HOLDS IBC AND HIGH-EFFICIENCY IP: Maxeon (spinout from SunPower) holds key IBC back-contact solar cell IP — relevant for any high-efficiency solar startup targeting premium segment; PEROVSKITE-SILICON TANDEM IS THE HIGHEST-VALUE WHITESPACE: Oxford PV (200+) is the leading perovskite tandem IP holder but the field is still early — perovskite composition IP, stability improvements, and scalable deposition methods are areas of genuine IP whitespace; WHEN TO PATENT IN SOLAR: NOVEL CELL ARCHITECTURE WITH MEASURED CERTIFIED EFFICIENCY EXCEEDING CURRENT RECORD: specific novel solar cell structure (specific specific material layers + specific specific fabrication process) with specific measured certified efficiency % at specific specific cell area (specific specific Voc V, Jsc mA/cm², FF %) exceeding the current record for that cell category (per Fraunhofer ISE solar cell efficiency chart) at specific specific standard test conditions STC 25°C 100 mW/cm² AM1.5G — certified efficiency records validated by independent test labs (NREL, Fraunhofer, JRC) are the gold standard for solar cell IP differentiation and are universally referenced in patent prosecution; NOVEL STABILITY IMPROVEMENT WITH MEASURED DAMP-HEAT AND UV STABILITY: specific novel perovskite stability innovation (specific specific encapsulation + specific specific passivation + specific specific composition) with specific measured stability data (specific specific PCE retention % after specific specific IEC 61215 damp-heat 85°C/85% RH hours, specific specific UV preconditioning 60 kWh/m², specific specific 200 thermal cycle -40°C to +85°C) vs. specific specific baseline perovskite without stability treatment — IEC 61215 reliability test data is essential for perovskite IP because it directly addresses the commercial viability concern of long-term stability; NOVEL MODULE INNOVATION WITH MEASURED LEVELIZED COST OF ELECTRICITY IMPROVEMENT: specific novel module design or process (specific specific cell-to-module integration + specific specific encapsulation + specific specific mounting) with specific measured LCOE impact (specific specific watts/m² improvement, specific specific bifacial albedo %, specific specific temperature coefficient, specific specific lifetime degradation rate %/year) vs. specific specific commercial PERC or TOPCon module baseline — module-level IP with measured energy yield improvement is commercially valuable even in a commodity market; KEY FTO CHECKLIST: First Solar CdTe VTD CSS 3 μm CdCl₂ vapor ZnTe+Cu back contact CdSe heterojunction P1/P2/P3 scribing 25.0% module 29.1% record; LONGi n-TOPCon SiO₂ 1.4-1.6 nm n+ poly-Si LPCVD POCl₃ LECO Al₂O₃+SiNx 25.4% G12 GW+ production; Panasonic HJT i/n a-Si:H 5-15 nm ITO Cu busbar 26.81% 0.750 V Voc bifacial 90-95%; Oxford PV Si-perovskite 2T monolithic Cs₀.₀₅FA₀.₈₁MA₀.₁₄ 1.68+1.12 eV 29.52% SnO₂+NiO ARC >1,000h 85°C/85% IEC 61215; Maxeon IBC interdigitated p/n Al₂O₃+SiNx FZ Si 160 μm 26.1-26.7% record no shading loss; FA₀.₈₃Cs₀.₁₇Pb(I₀.₈Br₀.₂)₃ MA-free 1.65 eV PEA 2D/3D 24.9% 1 cm² 1,000h stability; agrivoltaic bifacial 4 m elevation LER >1.3 -20% crop yield +1 MW/ha electricity; Heliogen AI heliostat 100+ mirrors 1,400 suns 1,000°C H₂ electrolysis Si TES 1,414°C $20/kWh.