Abstract
This work aims to simplify multi-dimensional femtosecond transient absorption microscopy (TAM) data into decay associated amplitude maps (DAAMs) that describe the spatial distributions of dynamical processes occurring on various characteristic timescales. Application of this method to TAM data obtained from a model methyl-ammonium lead iodide (CH3NH3PbI3) perovskite thin film allows us to simplify the data set comprising 68 time-resolved images into four DAAMs. These maps offer a simple means to visualize the complex electronic excited-state dynamics in this system by separating distinct dynamical processes evolving on characteristic timescales into individual spatial images. This approach provides new insight into subtle aspects of ultrafast relaxation dynamics associated with excitons and charge carriers in the perovskite thin film, which have recently been found to coexist at spatially distinct locations.
Original language | English |
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Article number | 114002 |
Journal | Nanotechnology |
Volume | 27 |
Issue number | 11 |
DOIs | |
State | Published - Feb 16 2016 |
Funding
BD''s research sponsored by the Laboratory Directed Research and Development Program of Oak Ridge National Laboratory, managed by UT-Battelle, LLC, for the US Department of Energy. BD also recognizes fruitful conversations and feedback from Dr Tessa R Calhoun. Work by MJS and Y-ZM were supported by the US Department of Energy, Office of Science, Basic Energy Sciences, Chemical Sciences, Geosciences, and Biosciences Division. Work by BY and KX was conducted at the Center for Nanophase Materials Sciences (CNMS), which is a DOE Office of Science User Facility. The analysis method was designed through the work of BD and Y-ZM. Computer codes were written by BD. MJS contributed to data collection and through valuable discussions. Work by BY and KX consisted of material preparation and characterization. The manuscript was written through contributions of all authors. All authors have given approval to the final version of the manuscript. BD''s research was sponsored by the Laboratory Directed Research and Development Program of Oak Ridge National Laboratory, managed by UT-Battelle, LLC, for the US Department of Energy. Work by Y-ZM and MJS was supported by the US Department of Energy, Office of Science, Basic Energy Sciences, Chemical Sciences, Geosciences, and Biosciences Division. Work by BY and KX was conducted at the Center for Nanophase Materials Sciences (CNMS), which is a DOE Office of Science User Facility.
Keywords
- big data
- decay associated spectrum
- nonlinear imaging
- ultrafast dynamics
- ultrafast imaging