CONSERV Anti-Acid EVA for TOPCon: An Economically Smarter Choice for Long-Term Reliability

Introduction

The rapid adoption of TOPCon technology marks a significant step forward in photovoltaic efficiency. However, as module architectures evolve, material reliability is emerging as a critical determinant of long-term performance.

Among these materials, traditional Ethylene Vinyl Acetate (EVA) is gaining renewed attention. While conventional EVA has served the industry well, its chemical limitations are increasingly misaligned with the demands of next-generation cell technologies.

Our solution, CONSERV Anti-Acid EVA, represents a targeted material innovation designed to address these challenges.

Reliability Gap in conventional EVA

Under prolonged exposure to UV radiation, elevated temperatures, and humidity, conventional EVA undergoes degradation that impacts both optical and electrical performance.

Two key mechanisms drive this: -

1.Chemical Instability of conventional EVA generates acetic acid when exposed to heat & moisture which in turn

Corrodes metallization Ag/ Al paste -> Increases contact resistance over time -> Accelerates Potential Induced Degradation

2.Optical Degradation of EVA in TOPCon cells

Standard EVA exhibits high yellowness after prolonged UV exposure -> reduced light transmission -> gradual power loss

Why TOPCon is sensitive?

TOPCon technology uses

o   Ultra-thin tunnel oxide layers

o   Advanced surface passivation

o   Higher efficiency with tighter process tolerances

These characteristics make the cell architecture more sensitive to chemical by-products

As a result, encapsulation is no longer a passive layer, it is a performance-critical component.

CONSERV AA EVA: A reliability focussed solution

RenewSys’ Anti-Acid EVA is engineered to mitigate the core failure modes associated with conventional EVA through:

o    Reduced acetic acid generation

o    Enhanced UV and thermal stability

o    Optimized polymer crosslinking chemistry

Performance Through a Data Lens

Parameter	CONSERV AA EVA	EVA
Optical Stability (∆ YI, PCT 72 hr)	∆ YI < 0.72	∆ YI < 1.21
Light Transmittance (PCT Test,48 hr, initial)	92.6, 92.8	92, 92.4
Corrosion Risk	Negligible	Moderate to High
Delamination Risk	Negligible	Moderate
PID Loss (3X IEC, 288 hr)	< 5% (good)	8.5 % (high)

What this means for Developers?

Technical Advantage	System-Level Impact	Business Outcome
Low Yellowness Index & High % Transmittance	Sustained light transmission CONSERV AA EVA shows 2X better results than conventional EVA	Higher energy yield over lifetime
Reduced acid generation	Lower corrosion & electrical losses	Improved module reliability
Low PID loss	Stable performance in high-voltage systems	Reduced performance variability
Improved material stability	Lower failure rates (hotspots/ delamination)	Reduced O&M costs
Consistent field performance	Lower degradation variability	Stronger bankability & investor confidence
Optimized for environments like India	Resilience under heat, humidity & UV	Better ROI in real-world conditions

Conclusion

As the industry continues its transition toward TOPCon technology, incremental efficiency gains alone are not sufficient. Durability and reliability must scale alongside performance.

CONSERV Anti Acid EVA is a strategic enabler for long-term value.