“Roller-Wheel”-Type Pt-Containing Small Molecules and the Impact of “Rollers” on Material Crystallinity, Electronic Properties, and Solar Cell Performance
Abstract
We report the synthesis, characterization, and detailed comparison of a series of novel Pt-bisacetylide containing conjugated small molecules possessing an unconventional “roller-wheel” shaped structure that is distinctly different from the “dumbbell” designs in traditional Pt-bisacetylide containing conjugated polymers and small molecules. The relationships between the chemical nature and length of the “rollers” and the electronic and physical properties of the materials are carefully studied by steady-state spectroscopy, cyclic voltammetry, differential scanning calorimetry, single-crystal X-ray diffraction, transient absorption spectroscopy, theoretical calculation, and device application. It was revealed that if the roller are long enough, these molecules can “slip-stack” in the solid state, leading to high crystallinity and charge mobility. Organic solar cells were fabricated and showed power conversion efficiencies up to 5.9%, out-performing all existing Pt-containing materials. The device performance was also found to be sensitive to optimization conditions and blend morphologies, which are a result of the intricate interplay among materials crystallinity, phase separation, and the relative positions of the lowest singlet and triplet excited states.
- Authors:
-
[1];
[2];
[1]
- Univ. of New Mexico, Albuquerque, NM (United States). Dept. of Chemistry & Chemical Biology
- Brookhaven National Lab. (BNL), Upton, NY (United States). Center for Functional Nanomaterials (CFN)
- Publication Date:
- Research Org.:
- Brookhaven National Laboratory (BNL), Upton, NY (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); USDA
- OSTI Identifier:
- 1376178
- Report Number(s):
- BNL-114161-2017-JA
Journal ID: ISSN 0002-7863; R&D Project: 16068
- Grant/Contract Number:
- SC0012704; IIA-1301346; CHE 04-43580; CHE 1602240
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of the American Chemical Society
- Additional Journal Information:
- Journal Volume: 139; Journal Issue: 40; Journal ID: ISSN 0002-7863
- Publisher:
- American Chemical Society (ACS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE
Citation Formats
He, Wenhan, Livshits, Maksim Y., Dickie, Diane A., Zhang, Zhen, Mejiaortega, Luis E., Rack, Jeffrey J., Wu, Qin, and Qin, Yang. “Roller-Wheel”-Type Pt-Containing Small Molecules and the Impact of “Rollers” on Material Crystallinity, Electronic Properties, and Solar Cell Performance. United States: N. p., 2017.
Web. doi:10.1021/jacs.7b05801.
He, Wenhan, Livshits, Maksim Y., Dickie, Diane A., Zhang, Zhen, Mejiaortega, Luis E., Rack, Jeffrey J., Wu, Qin, & Qin, Yang. “Roller-Wheel”-Type Pt-Containing Small Molecules and the Impact of “Rollers” on Material Crystallinity, Electronic Properties, and Solar Cell Performance. United States. https://doi.org/10.1021/jacs.7b05801
He, Wenhan, Livshits, Maksim Y., Dickie, Diane A., Zhang, Zhen, Mejiaortega, Luis E., Rack, Jeffrey J., Wu, Qin, and Qin, Yang. Fri .
"“Roller-Wheel”-Type Pt-Containing Small Molecules and the Impact of “Rollers” on Material Crystallinity, Electronic Properties, and Solar Cell Performance". United States. https://doi.org/10.1021/jacs.7b05801. https://www.osti.gov/servlets/purl/1376178.
@article{osti_1376178,
title = {“Roller-Wheel”-Type Pt-Containing Small Molecules and the Impact of “Rollers” on Material Crystallinity, Electronic Properties, and Solar Cell Performance},
author = {He, Wenhan and Livshits, Maksim Y. and Dickie, Diane A. and Zhang, Zhen and Mejiaortega, Luis E. and Rack, Jeffrey J. and Wu, Qin and Qin, Yang},
abstractNote = {We report the synthesis, characterization, and detailed comparison of a series of novel Pt-bisacetylide containing conjugated small molecules possessing an unconventional “roller-wheel” shaped structure that is distinctly different from the “dumbbell” designs in traditional Pt-bisacetylide containing conjugated polymers and small molecules. The relationships between the chemical nature and length of the “rollers” and the electronic and physical properties of the materials are carefully studied by steady-state spectroscopy, cyclic voltammetry, differential scanning calorimetry, single-crystal X-ray diffraction, transient absorption spectroscopy, theoretical calculation, and device application. It was revealed that if the roller are long enough, these molecules can “slip-stack” in the solid state, leading to high crystallinity and charge mobility. Organic solar cells were fabricated and showed power conversion efficiencies up to 5.9%, out-performing all existing Pt-containing materials. The device performance was also found to be sensitive to optimization conditions and blend morphologies, which are a result of the intricate interplay among materials crystallinity, phase separation, and the relative positions of the lowest singlet and triplet excited states.},
doi = {10.1021/jacs.7b05801},
journal = {Journal of the American Chemical Society},
number = 40,
volume = 139,
place = {United States},
year = {Fri Jul 21 00:00:00 EDT 2017},
month = {Fri Jul 21 00:00:00 EDT 2017}
}
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