Ordered perovskite structure with functional units for high performance and stable solar cells

Yulong Wang, Jiahui Chen, Yuxi Zhang, Wen Liang Tan, Zhiliang Ku, Yongbo Yuan, Qi Chen, Wenchao Huang, Christopher R. McNeill, Yi-Bing Cheng, Jianfeng Lu

Research output: Contribution to journalArticleResearchpeer-review


Ion migration is one of the most critical challenges that affects the stability of metal-halide perovskite solar cells (PSCs). However, the current arsenal of available strategies for solving this issue is limited. Here, novel perovskite active layers following the concept of ordered structures with functional units (OSFU) to intrinsically suppress ion migration, in which a three-dimensional (3D) perovskite layer is deposited by vapor deposition for light absorption and a 2D layer is deposited by solution process for ion inhibition, are constructed. As a promising result, the activation energy of ion migration increases from 0.36 eV for the conventional perovskite to 0.54 eV for the OSFU perovskite. These devices exhibit substantially enhanced operational stability in comparison with the conventional ones, retaining >85% of their initial efficiencies after 1200 h under ISOS-L-1. Moreover, the OSFU devices show negligible fatigue behavior with a robust performance under light/dark cycling aging test (ISOS-LC-1 protocol), which demonstrates the promising application of functional motif theory in this field.

Original languageEnglish
Article number2401416
Number of pages9
JournalAdvanced Materials
Issue number25
Publication statusPublished - 20 Jun 2024


  • fatigue behavior
  • functional units
  • ion migration
  • perovskite solar cells
  • stability

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