CH3NH3PbBr3–CH3NH3PbI3Perovskite–Perovskite Tandem Solar Cells with Exceeding 2.2 V Open Circuit Voltage

Jin Hyuck Heo, Sang Hyuk Im

Research output: Contribution to journalArticlepeer-review

104 Citations (Scopus)


MAPbBr3-MAPbI3 perovskite-perovskite tandem solar cells were fabricated by simple lamination technique of single junction MAPbBr3 and MAPbI3 planar hybrid solar cell. To synthesize CH3NH3 I (MAI) and CH3NH3Br (MABr), 50 mL hydriiodic acid and 50 mL hydrobromic acid were reacted with 30 mL methylamine in a 250 mL round-bottom fl ask at 0°C for 2 h with vigorous stirring, respectively. The products were recovered by evaporation and then were dissolved in ethanol, recrystallized from diethyl ether to increase the purity of products. Finally, the products were dried at room temperature in a vacuum oven for 24 h. To fabricate the tandem solar cells, A 60 nm thick dense bl-TiO2 was coated onto an FTO glass substrate by the spray pyrolysis deposition of titanium diisopropoxide bis(acetylacetonate) solution at 450°C to prevent direct contact between FTO and the hole-conducting layer. To measure the photovoltaic performance of sandwiched solar cells, the current density?voltage curves were measured by using a solar simulator. This simple technique was enabled because the thick P3HT or PTAA hole conductor with Li-TFSI and t-BP additives had improved conductivity due to the assistance of Li/Li+ redox shuttle, whereas the thick pristine P3HT or PTAA hole conductor cannot transport the holes efficiently to the HTM/PCBM interface due to poor conductivity.

Original languageEnglish
Pages (from-to)5121-5125
Number of pages5
JournalAdvanced Materials
Publication statusPublished - 2016 Jan 1
Externally publishedYes


  • bromide based materials
  • hybrid solar cells
  • lead triiodide
  • perovskite cells
  • tandem solar cells

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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