Video: How to Encapsulate PV and LED Devices with a UV Curable Epoxy
This video shows how to use a UV curable epoxy and a glass coverslip to encapsulate PV and LED devices.
Encapsulating the devices protects them against degradation by oxygen and moisture once removed from the glove box. True encapsulation for lifetimes of thousands of hours requires the use of glass welding technology and/or getter layers of calcium. However, we have developed a quick and effective way of encapsulating devices for lifetimes of several weeks or months under ambient conditions by using a specialised epoxy.
Ossila's UV curable epoxy has been specially selected to provide effective encapsulation while avoiding damaging the polymer or cathode underneath it during the setting process. By using this epoxy to bond a glass coverslip on top of the substrate, Ossila’s substrates can be used without degradation over the course of several weeks. Curing is achieved by using a low power UV light of approximately 380 nm over the course of about 30 minutes.
Note that if using the epoxy in a glove box then it must be given several days to outgas any absorbed oxygen/water before being applied to sensitive layers such as calcium.
- Using a Pasteur pipette, drop a small quantity of E131 encapsulation epoxy on the centre of the substrate.
- Place a glass coverslip on top and carefully press down to allow the epoxy to adequately coat the device.
- Move the coverslip gently to help air bubbles escape. Ensure that the active area and metal cathode are covered.
- Once all coverslips are in position, place the substrates inside a UV lamp and cure for approximately 30 minutes.
- This encapsulates the devices, and protects them from water and oxygen.