Journal ArticleDOI
Detailed comparison of the Williams–Watts and Cole–Davidson functions
C. P. Lindsey,G. D. Patterson +1 more
TLDR
In this paper, the distribution function of relaxation times underlying the nonexponential relaxation function of Williams and Watts is derived and compared with the analogous Cole-Davidson distribution function, and several useful relations between relaxation and distribution functions are summarized or derived, and the limitations of deriving distribution functions from relaxation functions are discussed.Abstract:
The distribution function of relaxation times underlying the nonexponential relaxation function of Williams and Watts is derived and compared with the analogous Cole–Davidson distribution function. In order to make the comparison between the two distribution functions, a simple empirical relationship between the Cole–Davidson and Williams–Watts parameters was determined which may be used to compare data analyzed using the two fitting functions. Although the relaxation functions are similar to each other, the distribution functions are quite dissimilar. The Cole–Davidson distribution shows a sharp long time cutoff, while the Williams–Watts distribution decays approximately exponentially at long times. Finally, several useful relations between relaxation and distribution functions are summarized or derived, and the limitations of deriving distribution functions from relaxation functions are discussed.read more
Citations
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Journal ArticleDOI
Understanding the Degradation of Methylenediammonium and Its Role in Phase-Stabilizing Formamidinium Lead Triiodide
Elisabeth A. Duijnstee,B. Gallant,Philippe Holzhey,Dominik J. Kubicki,Silvia Collavini,Bernd K. Sturdza,Harry C. Sansom,Joel Smith,Matthias J. Gutmann,Santanu Saha,Murali Gedda,M. I. Nugraha,Manuel Kober-Czerny,Chelsea Q. Xia,Adam D. Wright,Yen-Hung Lin,Alexandra J. Ramadan,A. K. Matzen,Seong Il Seo,Suer Zhou,Jongchul Lim,Thomas D. Anthopoulos,Marina R. Filip,Michael B. Johnston,Robin J. Nicholas,Juan Luis Delgado,Henry J. Snaith +26 more
TL;DR: In this article , the authors showed that the addition of methylenediammonium dichloride (MDACl2) to the perovskite lattice of FAPbI3-M is not the direct cause of the enhanced material stability.
Manipulation of Photoluminescence from Semiconductor Nanocrystals by Bandgap Engineering and Surface Plasmons
TL;DR: In this article, the optischen Eigenschaften von Halbleiter-Nanokristallen sind stark abhangig von Ladungstrager-Zustanden an der Nanokistalloberflache oder in the Nanokistsumgebung, was wiederum zum sogenannten Blinken von Nanokrists, dem zeitliche Wechseln zwischen Emission and Nicht-Emission von Licht, fuhren kann.
Journal ArticleDOI
Theoretical Aspects of Non-Debye Relaxation in Ionic Conductors
TL;DR: In this article, the authors investigated the collective transport properties of ionic conductors in a lattice-gas model of charged particles and found that the interplay of Coulomb-interactions among diffusing ions and structural disorder in the material provides a general mechanism for non-Debye relaxational effects commonly observed by experiment.
References
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Graham Williams,David C. Watts +1 more
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Journal ArticleDOI
Further considerations of non symmetrical dielectric relaxation behaviour arising from a simple empirical decay function
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