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Open Access Publications from the University of California

Chemical Stabilization of Perovskite Solar Cells with Functional Fulleropyrrolidines.

  • Author(s): Liu, Yao;
  • Page, Zachariah A;
  • Zhou, Dongming;
  • Duzhko, Volodimyr V;
  • Kittilstved, Kevin R;
  • Emrick, Todd;
  • Russell, Thomas P
  • et al.

While perovskite solar cells have invigorated the photovoltaic research community due to their excellent power conversion efficiencies (PCEs), these devices notably suffer from poor stability. To address this crucial issue, a solution-processable organic chemical inhibition layer (OCIL) was integrated into perovskite solar cells, resulting in improved device stability and a maximum PCE of 16.3%. Photoenhanced self-doping of the fulleropyrrolidine mixture in the interlayers afforded devices that were advantageously insensitive to OCIL thickness, ranging from 4 to 190 nm. X-ray photoelectron spectroscopy (XPS) indicated that the fulleropyrrolidine mixture improved device stability by stabilizing the metal electrode and trapping ionic defects (i.e., I-) that originate from the perovskite active layer. Moreover, degraded devices were rejuvenated by repeatedly peeling away and replacing the OCIL/Ag electrode, and this repeel and replace process resulted in further improvement to device stability with minimal variation of device efficiency.

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