articleJournal of the American Chemical SocietyAug 22, 2014Closed access

Femtosecond Time-Resolved Transient Absorption Spectroscopy of CH 3 NH 3 PbI 3 Perovskite Films: Evidence for Passivation Effect of PbI 2

LWLili WangCMChristopher McCleeseAKAnton KovalskyYZYixin ZhaoCBClemens Burda

Case Western Reserve University · Shanghai Jiao Tong University

PubMed
Indexed incrossrefpubmed

Abstract

CH3NH3PbI3 perovskite layered films deposited on substrates with and without a titania support structure have been prepared and studied using time-resolved femtosecond transient absorption (fs-TA) spectroscopy in the visible light range (450-800 nm). The electron injection dynamics from the photoexcited perovskite layers to the neighboring film structures could be directly monitored via the transient bleaching dynamics of the perovskite at ∼750 nm and thus systematically studied as a function of the layer-by-layer architecture. In addition, for the first time we could spectrally distinguish transient bleaching at ∼750 nm from laser-induced fluorescence that occurs red-shifted at ∼780 nm. We show that an…

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Topics & keywords

Topics
Keywords
  • Chemistry
  • Perovskite (structure)
  • Ultrafast laser spectroscopy
  • Femtosecond
  • Passivation
  • Absorption (acoustics)
  • Spectroscopy
  • Absorption spectroscopy
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