Hole Transporter Reinforcement for Deployable Perovskite Solar Cells

Perovskite solar cells are now beginning to achieve relevant real-world fielding data; however, long-term durability remains elusive. I will present our latest results on reinforcing the commonly used hole transport layer, PTAA, using a carbazole-based phosphonic acid overlayer, leading to more columnar growth of perovskite grains, a 40 mV V_OC enhancement, and improved proton radiation and thermal tolerances. The reinforcement strategy results in the most durable perovskites devices reported to date, with T₉₀ exceeding 2,500 h at 65°C under 1.2 AM1.5G illumination (T₈₀ >5,000 h). Deployed on a CubeSat, this device maintains T₈₀ for the complete mission duration of >95 days in Low Earth Orbit.