Perovskite oxide SrTiO3 as an efficient electron transporter for hybrid perovskite solar cells

Ashok Bera, Kewei Wu, Arif D. Sheikh, Erkki Alarousu, Omar F. Mohammed, Tao Wu

Research output: Contribution to journalArticlepeer-review

195 Scopus citations

Abstract

In this work, we explored perovskite oxide SrTiO3 (STO) for the first time as the electron-transporting layer in organolead trihalide perovskite solar cells. The steady-state photoluminescence (PL) quenching and transient absorption experiments revealed efficient photoelectron transfer from CH3NH3PbI3-xClx to STO. Perovskite solar cells with meso-STO exhibit an open circuit voltage of 1.01 V, which is 25% higher than the value of 0.81 V achieved in the control device with the conventional meso-TiO2. In addition, an increase of 17% in the fill factor was achieved by tailoring the thickness of the meso-STO layer. We found that the application of STO leads to uniform perovskite layers with large grains and complete surface coverage, leading to a high shunt resistance and improved performance. These findings suggest STO as a competitive candidate as electron transport material in organometal perovskite solar cells.
Original languageEnglish (US)
Pages (from-to)28494-28501
Number of pages8
JournalThe Journal of Physical Chemistry C
Volume118
Issue number49
DOIs
StatePublished - Dec 2 2014

ASJC Scopus subject areas

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

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