Assessment of polyolefin based encapsulants for perovskite PV
It is well known that external factors like oxygen and moisture can significantly reduce the stability of perovskite solar cells and modules. Moreover, the additives used in the encapsulant might lead to perovskite degradation. For this reason, it is critical to provide a proper encapsulation that will protect the cells from the environment and do not compromise their performance and stability. The results of the experiment will answer questions if the specific thermoplastic polyolefin encapsulants used for c-Si modules are also suitable for encapsulation of perovskite-based modules. If not, the experiment may provide first indications of what needs to be modified. The obtained knowledge will help in the development of stable perovskite modules for research purposes and towards the commercialization of perovskite-based PV products.
Status: Ongoing
Date of proposal: 29/11/2021
Start date: 23/02/2022
End Date: 22/07/2022
Used Instruments: S2SPSK line. TNO climate chamber.
Experimental Technique: Screening of thermoplastic polyolefin encapsulants. Damp heat test. Photovoltaic parameter measurement.
Experiment Description: Evaluation of 6 different thermoplastic polyolefin encapsulants for perovskite-based modules. Comparison with a reference encapsulant used internally at TNO. Stress testing of modules (damp-heat RH=85%, T=85C) for at least 1000 hours.
Type Samples: Thermoplastic polyolefin encapsulants. Perovskite-based modules.
Sample Description: Six different types of thermoplastic polyolefin encapsulants provided by Borealis. 18 processed and characterized modules, 14 encapsulated modules, 12 modules stress-tested.
Experiment Data Type: Photovoltaic parameters (reverse scan and MPPT values). Normalized Power Conversion Efficiency (PCE) during damp heat test.
Characterization Technics: Damp heat stress testing. Photovoltaic parameter measurement.
Characterization Data Type: Initial PV parameters of encapsulated modules. Evolution of normalized PCE during damp heat test.
Analyzed Data: Comparison of degradation patterns and PCE between different encapsulants. Analysis of water and moisture ingress effects on module performance.
Main Targets Project: Assessing the compatibility and performance of various thermoplastic polyolefin encapsulants with perovskite stacks developed by TNO.
Main Achievements Findings: Preliminary results show similar performance and compatibility for all tested encapsulants with TNO's perovskite stack. Observations suggest that current degradation in PCE is more related to the quality of the perovskite stack and encapsulation process rather than the encapsulant quality. Further reliability tests like thermal cycling are suggested for deeper insights.