Graded 2D/3D Perovskite Heterostructure for Efficient and Operationally Stable MA-Free Perovskite Solar Cells

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • Qin Yao
  • Qifan Xue
  • Zhenchao Li
  • Kaicheng Zhang
  • Teng Zhang
  • Ning Li
  • Shihe Yang
  • Christoph J. Brabec
  • Yong Cao

Detail(s)

Original languageEnglish
Article number2000571
Journal / PublicationAdvanced Materials
Volume32
Issue number26
Online published25 May 2020
Publication statusPublished - 2 Jul 2020
Externally publishedYes

Abstract

Almost all highly efficient perovskite solar cells (PVSCs) with power conversion efficiencies (PCEs) of greater than 22% currently contain the thermally unstable methylammonium (MA) molecule. MA-free perovskites are an intrinsically more stable optoelectronic material for use in solar cells but compromise the performance of PVSCs with relatively large energy loss. Here, the open-circuit voltage (Voc) deficit is circumvented by the incorporation of β-guanidinopropionic acid (β-GUA) molecules into an MA-free bulk perovskite, which facilitates the formation of quasi-2D structure with face-on orientation. The 2D/3D hybrid perovskites embed at the grain boundaries of the 3D bulk perovskites and are distributed through half the thickness of the film, which effectively passivates defects and minimizes energy loss of the PVSCs through reduced charge recombination rates and enhanced charge extraction efficiencies. A PCE of 22.2% (certified efficiency of 21.5%) is achieved and the operational stability of the MA-free PVSCs is improved.

Research Area(s)

  • 2D/3D heterostructures, ambient stability, energy loss, high efficiency, MA-free perovskite solar cells

Citation Format(s)

Graded 2D/3D Perovskite Heterostructure for Efficient and Operationally Stable MA-Free Perovskite Solar Cells. / Yao, Qin; Xue, Qifan; Li, Zhenchao et al.
In: Advanced Materials, Vol. 32, No. 26, 2000571, 02.07.2020.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review