Work Function Tuning of a Weak Adhesion Homojunction for Stable Perovskite Solar Cells

Chunyang Zhang, Yoosang Son, Hyungjun Kim, Sun-Ho Lee, Xin Liang, Guiming Fu, Sang-Uk Lee, Dong-Am Park, Qi Jiang, Kai Zhu, Nam-Gyu Park

Research output: Contribution to journalArticlepeer-review

Abstract

Perovskite solar cells (PSCs) have demonstrated a comparable efficiency to Si-based cells. However, the buried interface with weak adhesion remains a critical issue since the ion migration enhanced by the built-in electric field at this interface might lead to instability. We report here that adjusting the energy-level alignment at the weak adhesion homojunction interface can mitigate ion migration and thereby enhance the stability and photovoltaic performance of PSCs. Functional molecules with self-assembled monolayer characteristics were introduced to the surface of the SnO2 layer using silane derivatives, which tuned the work function of the homojunction depending on the functional groups in the molecules and thereby significantly reduced the built-in electric field. The PSC exhibited a power conversion efficiency (PCE) of 25.3%. The maximum power point (MPP) tracking under continuous illumination confirmed that the device retained more than 97% of its initial PCE, even after 1,000 h.
Original languageAmerican English
Pages (from-to)1394-1411
Number of pages18
JournalJoule
Volume8
Issue number5
DOIs
StatePublished - 2024

NREL Publication Number

  • NREL/JA-5900-89156

Keywords

  • homojunction
  • interface
  • perovskite
  • self-assembled monolayer
  • solar cell
  • stability
  • weak adhesion
  • work function tuning

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