Characterization of polymer materials for optimization of perovskite solar cell encapsulation
To tackle extrinsic instability issues of Perovskite solar cells (PSCs), teams in HZB and CEA both developed a glass-glass encapsulation based on a butyl edge sealant and a polymer encapsulant. Both encapsulation strategies processed by vacuum lamination enable their PSCs to pass the IEC 61215 damp heat test. The aim of this collaboration between CEA and HZB is to evaluate the encapsulation materials used in both institutes through specific methods developed at CEA and characterization tools available there. Additionally, the effect of the process temperature on the barrier properties of the polymer encapsulants would be studied. The results of the experiments would enable us to optimize our encapsulation strategy and potentially lower the process temperature, thus widening the range of devices that can be laminated. Finally, this project would allow both teams in HZB and CEA to exchange knowledge and experience on the topic of encapsulation and stability of perovskite solar cells.
Status: Ongoing
Date of proposal: 01/12/2021
Start date: 07/06/2022
End Date: 17/06/2022
Used Instruments: CEA_PK T
Experimental Technique: Permeation measurements using a Helium permeameter. Water vapor transmission rate (WVTR) measurements. Differential scanning calorimetry (DSC) Perovskite optical test. Vacuum lamination process.
Experiment Description: The project aims to optimize perovskite solar cell (PSC) encapsulation by comparing materials and processes used by HZB and CEA. This includes testing different encapsulants and edge sealants, evaluating their barrier properties, and analyzing their effect on PSC performance and stability.
Type Samples: Encapsulants: Polyolefin, Ionomer. Edge Sealants: Butyl (from Quanex and SAES). ITO/Perovskite/ITO layers stack for perovskite test.
Sample Description: Encapsulants processed at varying temperatures (100C, 130C, 150C) Perovskite solar cell layers for encapsulation and stability testing
Experiment Data Type: Helium permeation rates. WVTR data. DSC data for encapsulants and edge sealants. Optical measurements of perovskite layers.
Characterization Technics: Permeation and WVTR measurements for barrier property analysis. DSC for material characterization. Optical tests for perovskite layer stability analysis.
Characterization Data Type: Permeability and barrier properties of encapsulants. Glass transition and crosslinking temperatures of materials. Stability of perovskite layers under damp heat conditions.
Analyzed Data: Comparative analysis of encapsulation materials from HZB and CEA. Correlation between processing temperature and barrier properties of encapsulants. Effect of different encapsulation strategies on the stability of perovskite layers.
Main Targets Project: Optimizing encapsulation strategies for perovskite solar cells. Improving the stability and performance of PSCs through better encapsulation materials and processes.
Main Achievements Findings: Preliminary results suggest similar performance for various encapsulants and edge sealants. Indication that process temperature significantly affects the barrier properties of the encapsulants. Evidence that proper encapsulation can significantly improve the stability of PSCs under damp heat conditions.
Review 3
How would you describe your experience with the VIPERLAB opportunity? How did the experience/visit at CEA meet your expectations?
My experience was very positive. I would describe the Viperlab exchange as a great opportunity to collaborate with another institute on a common research interest. I am very grateful for the warm welcome by the host and the team at CEA and for the fruitful discussions we had. The visit there enabled me to attend the first measurements of our experimental plan and to learn a lot on several characterization techniques. It was also the beginning of a longer-term collaboration.
Did you face any difficulties during your visit or application process?
The application process was smooth and well explained on the Viperlab website. Any technical questions were answered by the host or by members from the Viperlab consortium.
Does this VIPERLAB experience at CEA bring you closer to your research objectives? How?
Yes, the subject and results of our collaboration (comparing different encapsulation materials and temperature processes for perovskite solar cells) are relevant for my research activity. Discovering a new research environment and infrastructures was also very valuable.
What other VIPERLAB activities have you participated in, or would you like to participate in?
I did not participate to any other activity so far but would be interested by future workshops.
Do you intend or already did publish/present your collected results in a paper or conference?
We are currently continuing the collaboration with further experiments which could lead to a publication.