A team led by MIT has achieved a significant breakthrough in the development of more durable and efficient perovskite solar cells. The international team of researchers developed a solutions-based process for two-dimensional (2D) perovskite interlayers, regulating crystallinity and phase purity.
Shaun Tan, the lead author, noted that while 2D perovskites are meant to protect the 3D perovskite layer, they can ironically be more fragile. This motivated the team to explore mixed solvents for a more robust 2D interlayer.
The new method allows for the growth of pure and highly crystalline 2D perovskites, which are key to their robustness. The champion device achieved a power conversion efficiency (PCE) of 25.9%, retaining 91% after 1,074 hours of testing. This performance rivals state-of-the-art inverted p-i-n devices, marking a significant step forward for n-i-p architecture solar cells.
The team's success opens doors for further exploration of 2D perovskites and mixed solvent combinations. Tan expressed excitement about expanding the method beyond their current work. This discovery could lead to more stable and efficient solar cells, contributing to a greener future.