Deciphering the Roles of MA-Based Volatile Additives for α-FAPbI 3 to Enable Efficient Inverted Perovskite Solar Cells

Functional additives that can interact with the perovskite precursors to form the intermediate phase have been proven essential in obtaining uniform and stable α-FAPbI3 films. Among them, Cl-based volatile additives are the most prevalent in the literature. However, their exact role is still unclear, especially in inverted perovskite solar cells (PSCs). In this work, we have systematically studied the functions of Cl-based volatile additives and MA-based additives in formamidinium lead iodide (FAPbI3)-based inverted PSCs. Using in situ photoluminescence, we provide clear evidence to unravel the different roles of volatile additives (NH4Cl, FACl, and MACl) and MA-based additives (MACl, MABr, and MAI) in the…

• CU
  City University of Hong Kong

  Awards: 11307621, MRP/040/21X, 202020164, 11316422, 9610508, GHP/018/20SZ, 9380086
• AP
  Aromatic Plant Research Center
• RG
  Research Grants Council, University Grants Committee

  Awards: 11316422, 11307621
• IA
  Innovation and Technology Commission

  Awards: GHP/018/20SZ, MRP/040/21X