Zn2SnO4-based photoelectrodes for organolead halide perovskite solar cells

Lee Seul Oh, Dong Hoe Kim, Jin Ah Lee, Seong Sik Shin, Jin Wook Lee, Ik Jae Park, Min Jae Ko, Nam Gyu Park, Sung Gyu Pyo, Kug Sun Hong, Jin Young Kim

Research output: Contribution to journalArticlepeer-review

74 Citations (Scopus)

Abstract

We report a new ternary Zn2SnO4 (ZSO) electron-transporting electrode of a CH3NH3PbI3 perovskite solar cell as an alternative to the conventional TiO2 electrode. The ZSO-based perovskite solar cells have been prepared following a conventional procedure known as a sequential (or two-step) process with ZSO compact/mesoscopic layers instead of the conventional TiO2 counterparts, and their solar cell properties have been investigated as a function of the thickness of either the ZSO compact layer or the ZSO mesoscopic layer. The presence of the ZSO compact layer has a negligible influence on the transmittance of the incident light regardless of its thickness, whereas the thickest compact layer blocks the back-electron transfer most efficiently. The open-circuit voltage and fill factor increase with the increasing thickness of the mesoscopic ZSO layer, whereas the short-circuit current density decreases with the increasing thickness except for the thinnest one (∼100 nm). As a result, the device with a 300 nm-thick mesoscopic ZSO layer shows the highest conversion efficiency of 7%. In addition, time-resolved and frequency-resolved measurements reveal that the ZSO-based perovskite solar cell exhibits faster electron transport (∼10 times) and superior charge-collection capability compared to the TiO2-based counterpart with similar thickness and conversion efficiency.

Original languageEnglish
Pages (from-to)22991-22994
Number of pages4
JournalJournal of Physical Chemistry C
Volume118
Issue number40
DOIs
Publication statusPublished - 2014 Oct 9
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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