High performance low-bandgap perovskite solar cells based on a high-quality mixed Sn-Pb perovskite film prepared by vacuum-assisted thermal annealing

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Meiyue Liu
  • Ziming Chen
  • Qifan Xue
  • Sin Hang Cheung
  • Shu Kong So
  • Yong Cao

Detail(s)

Original languageEnglish
Pages (from-to)16347-16354
Journal / PublicationJournal of Materials Chemistry A
Volume6
Issue number34
Publication statusPublished - 2018
Externally publishedYes

Abstract

Tandem perovskite solar cells are an effective concept to overcome the Shockley-Queisser limit of a single-junction perovskite solar cell. For a high-performance tandem cell, besides a wide-bandgap perovskite top cell, a high-quality low-bandgap perovskite bottom cell with an optimum bandgap of ∼1.2 eV is urgently needed. Moreover, a simple process technique needs to be developed for a high-quality perovskite film with good reproducibility, in order to further simplify the whole tandem-cell fabrication. Accordingly, we develop a simple one-step process (vacuum-assisted thermal annealing) for a high-quality low-bandgap CH3NH3Sn0.5Pb0.5IxCl3-x film, where the absorption edge can exceed 1000 nm. After comparing CH3NH3Sn0.5Pb0.5IxCl3-x films annealed in a vacuum and in a nitrogen environment, we find that vacuum-assisted thermal annealing can result in CH3NH3Sn0.5Pb0.5IxCl3-x films with better film coverage and crystallinity. This process can also accelerate the sublimation of methylammonium chloride and reduce the trap density in the CH3NH3Sn0.5Pb0.5IxCl3-x film. With this process, we successfully fabricated an efficient low-bandgap perovskite solar cell with a power conversion efficiency of more than 12% and good device reproducibility as well as long-term stability.

Bibliographic Note

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Citation Format(s)

High performance low-bandgap perovskite solar cells based on a high-quality mixed Sn-Pb perovskite film prepared by vacuum-assisted thermal annealing. / Liu, Meiyue; Chen, Ziming; Xue, Qifan; Cheung, Sin Hang; So, Shu Kong; Yip, Hin-Lap; Cao, Yong.

In: Journal of Materials Chemistry A, Vol. 6, No. 34, 2018, p. 16347-16354.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review