The Spacer Cations Interplay for Efficient and Stable Layered 2D Perovskite Solar Cells

Ning Zhou, Bolong Huang, Mingzi Sun, Yu Zhang, Liang Li, Yingzhuo Lun, Xueyun Wang, Jiawang Hong, Qi Chen, Huanping Zhou

Research output: Journal article publicationJournal articleAcademic researchpeer-review

35 Citations (Scopus)

Abstract

Organic spacer cations in layered 2D (A1)2(A2)n−1BnX3n+1 (where A1 is an organic cation acting as a spacer between the perovskite layers, A2 is a monovalent cation, e.g., Cs+,CH3NH3+, CH(NH2)2+) perovskite materials improve the long-term stability of the resulting solar cells, but hamper their power conversion efficiency due to poor carrier generation/transportation. Rational guidelines are thus required to enable the design of organic spacer cations. Herein, mixed A1 cations are employed in layered 2D perovskites to investigate the interplay between alkylamine cations and unsaturated alkylamine cations. It is revealed that alkylamine spacer cations are able to facilitate precursor assembly, which results in the orientated growth of perovskite crystals. Unsaturated alkylamine cations further lead to reduced exciton binding energy, which improves carrier pathway in the 2D perovskites. By mixing both cations, substantially improved open circuit voltage is observed in the resultant photovoltaic cells with the efficiency of 15.46%, one of the highest one based on (A1)2(A2)3Pb4I13 layered 2D perovskites. The generality of the design principle is further extended to other cation combinations.

Original languageEnglish
Article number1901566
JournalAdvanced Energy Materials
Volume10
Issue number1
DOIs
Publication statusPublished - 1 Jan 2020

Keywords

  • 2D perovskites
  • efficiency
  • exciton binding energy
  • organic spacers
  • solar cells

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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