Additive-associated antisolvent engineering of perovskite films for highly stable and efficient p–i–n perovskite solar cells

Abstract

The defects at the surface and grain boundary of perovskite films are detrimental to constructing highly stable and efficient perovskite solar cells (Pero-SCs). Here, we propose a facile additive-associated antisolvent engineering (AAE) method to acquire high-quality perovskite films. The additives and antisolvent adopt in the current study are zwitterionic taurine and chlorobenzene. It has been proven that the AAE method can slow down the nucleation process during thermal annealing and consequently passivate the defects of perovskite films via coordination and hydrogen bonding. After being treated with AAE, the champion power conversion efficiency of p–i–n Pero-SCs based on Cs_0.05(FA_0.92MA_0.08)_0.95Pb(I_0.92Br_0.08)₃ is improved from 19.73% to 22.54%. Concomitantly, the device stability is also improved. Being stored in a glovebox filled with N₂, the unencapsulated Pero-SCs treated with AAE maintain 80% and 94% of the initial PCEs in 2500 h at 70 °C and in 3200 h at room temperature, respectively.