Defect Passivation in Perovskite Solar Cells
Defect passivation plays a crucial role in enhancing the stability of perovskite solar cells (PSCs). Here’s how it contributes:
Role of Defect Passivation
- Reduction of Carrier Recombination: Defects in perovskite films can lead to non-radiative recombination, which decreases the power conversion efficiency (PCE) of solar cells. Passivating these defects reduces carrier recombination, thereby improving the overall performance of PSCs.
- Enhancement of Efficiency: By eliminating or mitigating the effects of defects, passivation techniques can significantly enhance the efficiency of perovskite solar cells. Studies have shown that the use of appropriate passivation molecules can result in higher PCEs compared to untreated cells.
- Long-Term Stability: One of the major issues with PSCs is their stability over time. Defect passivation helps in maintaining the stability of PSCs by preventing degradation caused by defects. This is achieved through improved hydrophobicity of the perovskite surface and other mechanisms that reduce environmental effects like moisture.
- Improvement in Crystal Structure and Interface Quality: Techniques such as thermal-phase transition engineering for defect passivation can further improve the crystal structure and interface quality of perovskite layers, enhancing both efficiency and stability.
Techniques for Defect Passivation
- Molecular Passivation: Using molecules like TTFA, PEAI, PI, BPY, and DQCN to passivate surface defects. These molecules can effectively inhibit non-radiative recombination without affecting grain size and morphology.
- Thermal-Phase Transition Engineering: This method involves using phase transitions to efficiently passivate defects, improving stability and PCE.
- Use of Sacrificial Layers: Implementing a sacrificial layer that absorbs moisture instead of affecting the perovskite layer directly.
Overall, defect passivation is a critical strategy for optimizing the performance and durability of perovskite solar cells.
Original article by NenPower, If reposted, please credit the source: https://nenpower.com/blog/what-role-does-defect-passivation-play-in-the-stability-of-perovskite-solar-cells/
