Uncovering synergistic effect of chloride additives for efficient quasi-2D perovskite solar cells
CHEMICAL ENGINEERING JOURNAL(2022)
摘要
Methylammonium chloride (MACl) and lead chloride (PbCl2) are commonly used for improving perovskite film quality. However, the rapid release of volatile MACl would lead to low-quality perovskite films with pinholes and defects. Here, we report a strategy of employing MACl & PbCl2 binary additives together to prepare high-quality quasi-two-dimensional (Q-2D) Ruddlesden-Popper (RP) perovskite films. We found that MAPbCl(3) intermediate phase is formed via a reaction between MACl and PbCl2, which suppresses the fast volatilization of MACl, resulting in a compact and pinhole-free perovskite film with large grains. Moreover, the trap states are passivated via the incorporation of Cl(- )into the Q-2D perovskite crystals along with the addition of PbCl2, leading to a reduced charge recombination loss and an improved charge extraction. A remarkable power conversion efficiency (PCE) of 18.67% is achieved in such Q-2D RP PSCs, one of the highest PCE values among the low-dimensional RP PSCs with n & LE; 4. The environmental stability of the devices is also significantly enhanced. Our results provide an effective strategy by using chloride based additives for fabricating high-quality low-dimensional RP perovskite films for efficient solar cells.
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关键词
quasi-2D perovskite solar cells, Chloride additives, Passivation, Intermediate phase, Charge extraction
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