Robust Stability of Efficient Lead-Free Formamidinium Tin Iodide Perovskite Solar Cells Realized by Structural Regulation

Research output: Contribution to journalArticleScientificpeer-review


  • Weiyin Gao
  • Chenxin Ran
  • Jingrui Li
  • Hua Dong
  • Bo Jiao
  • Lijun Zhang
  • Xuguang Lan
  • Xun Hou
  • Zhaoxin Wu

Research units

  • Xi'an Jiaotong University
  • Shanxi University
  • Jilin University


The instability issue of Pb-free Sn-based perovskite is one of the biggest challenges for its application in optoelectronic devices. Herein, a structural regulation strategy is demonstrated to regulate the geometric symmetry of formamidiniumtin iodide (FASnI3) perovskite. Experimental and theoretical works show that the introduction of cesium cation (Cs+) could improve the geometric symmetry, suppress the oxidation of Sn2+, and enhance the thermodynamical structural stability of FASnI3. As a result, the inverted planar Cs-doped FASnI3-based perovskite solar cell (PSC) is shown to maintain 90% of its initial power-conversion efficiency (PCE) after 2000 h stored in N2, which is the best durability to date for 3D Sn-based PSCs. Most importantly, the air, thermal, and illumination stabilities of the PSCs are all improved after Cs doping. The PCE of the Cs-doped PSC shows a 63% increase compared to that of the control device (from 3.74% to 6.08%) due to the improved quality of the Cs-doped FASnI3 film.


Original languageEnglish
Pages (from-to)6999-7006
Number of pages8
JournalJournal of Physical Chemistry Letters
Issue number24
Publication statusPublished - 20 Dec 2018
MoE publication typeA1 Journal article-refereed

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