Jump to main content
Jump to site search


High Performance Low-Bandgap Perovskite Solar Cells Based on High-Quality Mixed Sn-Pb Perovskite Film Prepared by Vacuum-Assisted Thermal Annealing

Abstract

Tandem perovskite solar cell is an effective concept to overcome the Shockley-Queisser limit of single-junction perovskite solar cell. For high-performance tandem cell, besides wide-bandgap perovskite top cell, high-quality low-bandgap perovskite bottle cell with optimum bandgap of ~1.2 eV is urgently needed. Moreover, a simple process technique needs to be developed for 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 high-quality low-bandgap CH3NH3Sn0.5Pb0.5IxCl3-x film, which 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 accelerates the sublimation of methylammonium chloride and reduce the trap density in 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.

Back to tab navigation

Supplementary files

Publication details

The article was received on 08 Jun 2018, accepted on 05 Aug 2018 and first published on 07 Aug 2018


Article type: Communication
DOI: 10.1039/C8TA05444D
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
  •   Request permissions

    High Performance Low-Bandgap Perovskite Solar Cells Based on High-Quality Mixed Sn-Pb Perovskite Film Prepared by Vacuum-Assisted Thermal Annealing

    M. Liu, Z. Chen, Q. Xue, S. H. Cheung, S. So, H. Yip and Y. Cao, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA05444D

Search articles by author

Spotlight

Advertisements