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<p>As an important component to connect the electron transport layer (ETL) and the cathode electrode, the cathode interface layer (CIL) is key to enhancing electron transport and suppressing metal electrode corrosion in inverted perovskite solar cells (PSCs). In this work, three D-A-D type cathode interface materials (DPP-PhN, DPP-F3N, and ffBT-F3N) are designed and synthesized employing dimethylamino-benzene or bis(dimethylamino)propyl-fluorene as electron donating (D) unit, and pyrrolo[3,4-c]-pyrrole-1,4-dione (DPP) or benzothiadiazole (BT) as electron accepting (A) unit for efficient inverted PSCs. The impact of variations in the A and D units on the energy levels, conductivity, interfacial dipoles, and carrier interfacial dynamics of CILs were systematically studied. On the one hand, DPP-F3N possesses the highest conductivity and the strongest interfacial dipole. On the other hand, the DPP-F3N is most favorable for forming ohmic contacts between the ETL and the cathode electrode to improve electron transport and prevent carrier recombination. As a result, the inverted PSCs using DPP-F3N as the CIL obtained the highest power conversion efficiency (PCE) of 25.19%. However, in terms of stability, the ffBT-F3N-based inverted PSCs show the best stability due to the strong interaction between the ffBT-F3N and the Ag electrode, which could effectively delay the corrosion of the Ag electrode.</p>

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Molecular engineering of D-A-D type cathode interface materials for efficient and stable inverted perovskite solar cells

  • 期刊论文

  • 发表日期：

    2025年3月19日

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  • Qiang Guo,
  • Lei Gao,
  • Mengzhen Du,
  • Jiaxing Song,
  • Zhiyang Xu,
  • Zhichao Cai,
  • Tangyue Xue,
  • Cong Li,
  • Zhi Zheng,
  • Helin Wang,
  • Zaifang Li,
  • Erjun Zhou

摘要

As an important component to connect the electron transport layer (ETL) and the cathode electrode, the cathode interface layer (CIL) is key to enhancing electron transport and suppressing metal electrode corrosion in inverted perovskite solar cells (PSCs). In this work, three D-A-D type cathode interface materials (DPP-PhN, DPP-F3N, and ffBT-F3N) are designed and synthesized employing dimethylamino-benzene or bis(dimethylamino)propyl-fluorene as electron donating (D) unit, and pyrrolo[3,4-c]-pyrrole-1,4-dione (DPP) or benzothiadiazole (BT) as electron accepting (A) unit for efficient inverted PSCs. The impact of variations in the A and D units on the energy levels, conductivity, interfacial dipoles, and carrier interfacial dynamics of CILs were systematically studied. On the one hand, DPP-F3N possesses the highest conductivity and the strongest interfacial dipole. On the other hand, the DPP-F3N is most favorable for forming ohmic contacts between the ETL and the cathode electrode to improve electron transport and prevent carrier recombination. As a result, the inverted PSCs using DPP-F3N as the CIL obtained the highest power conversion efficiency (PCE) of 25.19%. However, in terms of stability, the ffBT-F3N-based inverted PSCs show the best stability due to the strong interaction between the ffBT-F3N and the Ag electrode, which could effectively delay the corrosion of the Ag electrode.