Impact of Storage on Spiro-OMeTAD
Storage conditions can significantly affect the conductivity and molecular orbital levels of spiro-OMeTAD, a widely used hole transport material in perovskite solar cells. Here’s a breakdown of how storage conditions influence its properties:
Conductivity
- Stability and Degradation: Studies have shown that the conductivity of spiro-OMeTAD can decrease over time, especially under elevated temperatures. This degradation is likely due to the material’s instability when exposed to heat and environmental factors.
- Environmental Impact: Exposure to air, moisture, and heat can lead to oxidation and degradation processes that reduce the conductivity of spiro-OMeTAD.
Molecular Orbital Level
- Oxidation State: Spiro-OMeTAD’s molecular orbital levels are influenced by its oxidation state. Oxidized spiro-OMeTAD tends to be unstable and readily reduces back to its neutral state upon interaction with perovskite compositions.
- Doping Effects: Doping spiro-OMeTAD with additives like LiTFSI and tBP, or using acid additives, can enhance its conductivity by altering the molecular orbital levels and facilitating charge transport.
Storage Recommendations
- Temperature Control: Maintaining a stable, lower temperature (e.g., room temperature) can help mitigate rapid degradation.
- Shielding from Environment: Sealing spiro-OMeTAD in an inert atmosphere or using protective coatings can prevent oxidation and moisture exposure.
Overall, the storage conditions can significantly impact the performance of spiro-OMeTAD by affecting its conductivity and stability. Proper handling and storage techniques are crucial to maintain its effectiveness in solar cell applications.
Original article by NenPower, If reposted, please credit the source: https://nenpower.com/blog/how-does-storage-affect-the-conductivity-and-molecular-orbital-level-of-spiro-ometad/
