Metal–Organic Framework Photoconductivity via Time-Resolved Terahertz Spectroscopy
- 9 June 2019
- journal article
- research article
- Published by American Chemical Society (ACS) in Journal of the American Chemical Society
- Vol. 141 (25), 9793-9797
- https://doi.org/10.1021/jacs.9b04338
Abstract
While metal-organic frameworks (MOFs) have been under thorough investigation over the past two decades, photoconductive MOFs are an emerging class of materials with promising applications in light harvesting and photocatalysis. To date, there is not a general method to investigate the photoconductivity of polycrystalline MOF samples as-prepared. Herein, we utilize time-resolved terahertz spectroscopy along with a new sample preparation method to determine the photoconductivity of Zn2TTFTB, an archetypical conductive MOF, in a non-contact manner. Using this technique, we were able to gain insight into MOF photoconductivity dynamics with sub-picosecond resolution, revealing two distinct carrier lifetimes of 0.6 ps and 31 ps and a long-lived component of several ns. Additionally, we determined the frequency dependent photoconductivity of Zn2TTFTB which was shown to follow Drude-Smith behavior. Such insights are crucially important with regard to developing the next generation of functional photoconductive MOF materials.Keywords
Funding Information
- Basic Energy Sciences (DE-FG02-07ER15909)
- Nakatani Foundation for Advancement of Measuring Technologies in Biomedical Engineering
- TomKat Foundation
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