TY - JOUR
T1 - Metal-Organic Framework Photoconductivity via Time-Resolved Terahertz Spectroscopy
AU - Pattengale, Brian
AU - Neu, Jens
AU - Ostresh, Sarah
AU - Hu, Gongfang
AU - Spies, Jacob A.
AU - Okabe, Ryotaro
AU - Brudvig, Gary W.
AU - Schmuttenmaer, Charles A.
N1 - Funding Information:
We acknowledge financial support from Office of Basic Energy Sciences, Division of Chemical Sciences, Geosciences, and Energy Biosciences, and from the Department of Energy, under contract DE-FG02-07ER15909, as well as from a generous donation from the TomKat Foundation. R.O. acknowledges funding from the Nakatani Foundation for performing research at Yale University in the Schmuttenmaer group.
PY - 2019/6/26
Y1 - 2019/6/26
N2 - 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 noncontact manner. Using this technique, we were able to gain insight into MOF photoconductivity dynamics with subpicosecond resolution, revealing two distinct carrier lifetimes of 0.6 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.
AB - 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 noncontact manner. Using this technique, we were able to gain insight into MOF photoconductivity dynamics with subpicosecond resolution, revealing two distinct carrier lifetimes of 0.6 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.
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U2 - 10.1021/jacs.9b04338
DO - 10.1021/jacs.9b04338
M3 - Article
C2 - 31179698
AN - SCOPUS:85067994305
VL - 141
SP - 9793
EP - 9797
JO - Journal of the American Chemical Society
JF - Journal of the American Chemical Society
SN - 0002-7863
IS - 25
ER -