Defect passivation in methylammonium/bromine free inverted perovskite solar cells using charge-modulated molecular bonding

Abstract Molecular passivation is a prominent approach for improving the performance and operation stability of halide perovskite solar cells (HPSCs). Herein, we reveal discernible effects of diammonium molecules with either an aryl or alkyl core onto Methylammonium-free perovskites. Piperazine dihydriodide (PZDI), characterized by an alkyl core-electron cloud-rich-NH terminal, proves effective in mitigating surface and bulk defects and modifying surface chemistry or interfacial energy band, ultimately leading to improved carrier extraction. Benefiting from superior PZDI passivation, the device achieves an impressive efficiency of 23.17% (area ~1 cm 2 ) (low open circuit voltage deficit ~0.327 V) along with…

• NE
  New Energy and Industrial Technology Development Organization

  Award: JPNP21014
• JS
  Japan Science and Technology Agency

  Award: JPMJMI21E6
• NI
  National Institute for Materials Science