Hysteresis-less mesoscopic CH3NH3PbI3 perovskite hybrid solar cells by introduction of Li-treated TiO2 electrode

Jin Hyuck Heo, Myoung Sang You, Min Hyuk Chang, Wenping Yin, Tae Kyu Ahn, Sang-Ju Lee, Shi-Joon Sung, Dae Hwan Kim, Sang Hyuk Im

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190 Citations (Scopus)

Abstract

A great current density-voltage (J-V) hysteresis with respect to the scan direction is important issue in perovskite hybrid solar cells because the power conversion efficiency is sometimes incorrect. Here, we demonstrated >17% mesoscopic CH3NH3PbI3 (MAPbI3) perovskite hybride solar cells without significant J-V hysteresis with respective to the scan direction and rated by using Li-treated mesoscopic TiO2 electrode. The Li-treated mesoscopic TiO2 electrode improved charge separation/injection from MAPbI3 into mesoscopic TiO2, charge transport in mesoscopic TiO2, and surface traps because the conduction band edge of mesoscopic TiO2 was lowered by ~0.1eV, the mobility of charge carriers was increased from ~1.1×10-6cm2/Vs to ~2.5×10-6cm2/Vs, the conductivity of mesoscopic TiO2 was increased from ~5.6×10-7S/cm to ~1.6×10-6S/cm, and the trap density was reduced from ~1.2×1016cm-3 to ~9.3×1015cm-3 through Li-treatment. Therefore, the average power conversion efficiency was significantly enhanced from 14.84% to 17.26% at 1sun condition by the Li-treatment of mesoscopic TiO2.

Original languageEnglish
Pages (from-to)530-539
Number of pages10
JournalNano Energy
Volume15
DOIs
Publication statusPublished - Jul 2015
Externally publishedYes

Keywords

  • Hybrid solar cells
  • J-V hysteresis
  • Li-treatment
  • Methylammoniumleadtriiodide
  • Perovskite

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