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Transient Interphase Assisted Crystallization of Antisolvent-Free Perovskite for Enhanced Device Performance.

Yongjun Liu1, Caiyu Zhong1, Haoyu Cai1

  • 1State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, P. R. China.

Advanced Materials (Deerfield Beach, Fla.)
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Summary

Antisolvent-free perovskite solar cells achieve high efficiency using a transient interphase strategy. This method suppresses phase segregation, enhancing both performance and long-term stability for scalable manufacturing.

Keywords:
Cs segregationCs0.05FA0.95PbI3antisolvent‐freephase separationtransient interphase

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Photovoltaics

Background:

  • Scalable manufacturing of perovskite solar cells (PSCs) is hindered by phase segregation during crystallization.
  • Antisolvent-free methods are desirable but face challenges in controlling crystallization rates.

Purpose of the Study:

  • To develop an antisolvent-free strategy for PSCs to improve device performance and stability.
  • To manipulate nucleation and crystal growth to mitigate phase segregation.

Main Methods:

  • Implementation of a transient interphase strategy using tetramethylurea (TMU).
  • TMU induces instantaneous nucleation and forms a transient interphase to balance crystallization.
  • Formation of the desired α-CsXFA1-XPbI3 phase.

Main Results:

  • Achieved a power conversion efficiency of 25.63% for single devices.
  • Demonstrated a module efficiency of 19.62%.
  • Exhibited exceptional operational stability with negligible degradation after 1700 hours (ISOS-L-1) and retained 90% efficiency after 3500 hours.

Conclusions:

  • The transient interphase strategy effectively suppresses phase segregation in antisolvent-free PSCs.
  • This approach significantly enhances device efficiency and long-term stability.
  • Represents the longest reported MPPT stability for antisolvent-free CsXFA1-XPbI3-based PSCs.