Highly efficient metal halide substituted CH3NH3I(PbI2)1−X(CuBr2)X planar perovskite solar cells

Muhammad Jahandar, Jin Hyuck Heo, Chang Eun Song, Ki Jeong Kong, Won Suk Shin, Jong Cheol Lee, Sang Hyuk Im, Sang Jin Moon

Research output: Contribution to journalArticlepeer-review

103 Citations (Scopus)


By substitution of some part of PbI2 to CuBr2 in CH3NH3PbI3 perovskite film, we fabricated inverted indium tin oxide (ITO)/poly(3,4-ethlenedioxythiophene):poly(styrenesulphonic acid) (PEDOT: PSS)/CH3NH3I(PbI2)1−X(CuBr2)X (x=0, 0.025, 0.050, 0.075, and 0.100)/Phenyl-C61-butyric acid methyl ester (PCBM)/LiF/Al planar perovskite solar cells via solvent dripping process. Whereas the PbI2-DMSO2 (DMSO:dimethyl sulfoxide) intermediate is not flowable during heat-treatment process due to the simultaneous melting and decomposition, the CuBr2-DMSO2 intermediate is flowable so that the CH3NH3I(PbI2)1−X(CuBr2)X perovskite could form larger crystalline grains more reproducibly than the MAPbI3 film. From the capacitance-voltage (C-V) characteristics and density functional theory (DFT) calculation, we could know that the conductivity of MAPbI3 is much enhanced by CuBr2 substitution of PbI2 due to enhance charge carriers. Accordingly, the inverted CH3NH3I(PbI2)1−X(CuBr2)X (x=0.050) planar perovskite solar cells showed greatly improved device efficiency (average of 50 sample = 16.17 ± 0.79 %, best = 17.09 %) than the efficiency of MAPbI3 device (average of 50 sample = 12.02 ± 0.86 %, best = 13.18 %) and did not show significant current density-voltage (J-V) hysteresis with respect to the scan direction.

Original languageEnglish
Pages (from-to)330-339
Number of pages10
JournalNano Energy
Publication statusPublished - 2016 Sept 1
Externally publishedYes

Bibliographical note

Funding Information:
M. Jahandar and J. H. Heo contributed equally to this work. This work is financially supported by a grant from the cooperative R&D Program ( B551179-08-03-00 ) funded by the Korea Research Council Industrial Science and Technology and the Technology Development Program to Solve Climate Changes of the National Research Foundation (NRF) funded by the Ministry of Science, ICT & Future Planning ( 2015M1A2A2055631 ), Republic of Korea. Appendix A


  • Copper (II) bromide
  • Cu-doped perovskite
  • Perovskite grain growth
  • Perovskite solar cells
  • Planar perovskite

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • General Materials Science
  • Electrical and Electronic Engineering


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