| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Functional Nanomaterials 2020: Translating Innovation into Pioneering Technologies
|
| Presentation Title |
Carrier Lifetime Dependence on Annealing Conditions in CuxOy Thin Films: A Transient Absorption Study |
| Author(s) |
Susanne Ullrich, Learnmore Tanaka Shenje |
| On-Site Speaker (Planned) |
Susanne Ullrich |
| Abstract Scope |
Ultrafast transient absorption spectroscopy has been used to study charge carrier dynamics in Copper(I) and Copper(II) oxide thin films, produced under various annealing conditions, as a function of Cu2O/CuO composition. Following across bandgap excitations, deactivation proceeds via free and trapped excitonic states in pure Cu2O, whereas CuO shows free carrier relaxation via shallow and deep (midgap) trap states. These observations serve as a reference in the characterization of a series of mixed phase (Cu2O/CuO) samples with increasing amounts of CuO. Generally, across bandgap excitation of the CuO phase results in deactivation within the same phase and the same is true for Cu2O excitation in some of the samples. Most interesting, however, is the observation of charge transfer dynamics from the Cu2O phase to CuO for samples prepared under certain annealing conditions. These processes are measured to occur on time scales of a few picoseconds. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |