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Hybridization of Atomic Orbitals I03:24

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Efficient and Stable β-CsPbI

Yifan Lv1, Yiqun Li1, Yan Zhou1

  • 1Key Laboratory of Flexible Electronics (KLOFE) & Institution of Advanced Materials (IAM), School of Flexible Electronics (Future Technologies), Nanjing Tech University (NanjingTech), Nanjing, Jiangsu 211816, P.R. China.

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|June 8, 2023
PubMed
Summary
This summary is machine-generated.

Cesium lead iodide (CsPbI3) perovskite thin films were stabilized in their photoactive phase using MAAc solvent. This method enhances perovskite solar cell efficiency and stability, crucial for photovoltaic applications.

Keywords:
ionic liquidperovskite solar cellssolvent engineeringβ-CsPbI3

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Area of Science:

  • Materials Science
  • Photovoltaics
  • Solid-State Chemistry

Background:

  • Cesium lead iodide (CsPbI3) is a promising perovskite material for solar cells due to its band gap and thermal stability.
  • CsPbI3 is prone to phase transitions from its photoactive to photoinactive state, especially in humid conditions, limiting device performance.
  • Controllable growth of CsPbI3 thin films in the desired β-crystal phase and with compact morphology is essential for efficient and stable perovskite solar cells (PSCs).

Purpose of the Study:

  • To develop a method for the controllable growth of β-CsPbI3 perovskite thin films.
  • To enhance the phase stability and morphology of CsPbI3 for improved PSC performance.
  • To investigate the role of solvent and coordination in stabilizing the photoactive phase of CsPbI3.

Main Methods:

  • Utilized MAAc (N-methylacetamide) as a solvent for the CsPbI3 precursor solution.
  • Investigated the formation of an intermediate compound (CsxMA1-xPbIxAc3-x) during solution processing.
  • Analyzed the effect of annealing on ion exchange and phase transformation.
  • Studied the role of C═O···Pb coordination in stabilizing the β-CsPbI3 phase.

Main Results:

  • Fabricated β-CsPbI3 perovskite thin films using MAAc solvent, leading to controllable growth.
  • Observed the formation of an intermediate compound and subsequent ion exchange during annealing.
  • Demonstrated that C═O···Pb coordination stabilizes the black-phase β-CsPbI3.
  • Achieved PSCs with a power conversion efficiency of 18.9%.
  • Exhibited improved device stability, with <10% efficiency decay after 2000 h in N2 and <30% decay after 500 h in humid air without encapsulation.

Conclusions:

  • MAAc solvent facilitates the formation of stable β-CsPbI3 perovskite thin films.
  • Strong C═O···Pb coordination is key to stabilizing the photoactive phase and promoting desired crystal growth.
  • The developed method significantly enhances both the efficiency and stability of CsPbI3-based PSCs, paving the way for practical applications.