Conjugated Molecules “Bridge”: Functional Ligand toward Highly Efficient and Long-Term Stable Perovskite Solar Cell

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Details

Original languageEnglish
Article number1808119
Pages (from-to)1-11
JournalAdvanced Functional Materials
Publication statusPublished - 1 Jan 2019
MoE publication typeA1 Journal article-refereed

Researchers

  • Hua Dong
  • Jun Xi
  • Lijian Zuo
  • Jingrui Li

  • Yingguo Yang
  • Dongdong Wang
  • Yue Yu
  • Lin Ma
  • Chenxin Ran
  • Weiyin Gao
  • Bo Jiao
  • Jie Xu
  • Ting Lei
  • Feijie Wei
  • Fang Yuan
  • Lin Zhang
  • Yifei Shi
  • Xun Hou
  • Zhaoxin Wu

Research units

  • Xi'an Jiaotong University
  • Shanxi University
  • Seoul National University
  • University of Washington
  • Chinese Academy of Sciences
  • Xidian University

Abstract

Interfacial ligand passivation engineering has recently been recognized as a promising avenue, contributing simultaneously to the optoelectronic characteristics and moisture/operation tolerance of perovskite solar cells. To further achieve a win-win situation of both performance and stability, an innovative conjugated aniline modifier (3-phenyl-2-propen-1-amine; PPEA) is explored to moderately tailor organolead halide perovskites films. Here, the conjugated PPEA presents both “quasi-coplanar” rigid geometrical configuration and distinct electron delocalization characteristics. After a moderate treatment, a stronger dipole capping layer can be formed at the perovskite/transporting interface to achieve favorable banding alignment, thus enlarging the built-in potential and promoting charge extraction. Meanwhile, a conjugated cation coordinated to the surface of the perovskite grains/units can form preferably ordered overlapping, not only passivating the surface defects but also providing a fast path for charge exchange. Benefiting from this, a ≈21% efficiency of the PPEA-modified solar cell can be obtained, accompanied by long-term stability (maintaining 90.2% of initial power conversion efficiency after 1000 h testing, 25 °C, and 40 ± 10 humidity). This innovative conjugated molecule “bridge” can also perform on a larger scale, with a performance of 18.43% at an area of 1.96 cm2.

    Research areas

  • conjugation, delocalization, interfacial dipole, perovskite, solar cells

ID: 32112459