期刊
NANO LETTERS
卷 18, 期 3, 页码 1600-1607出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.7b04211
关键词
PEDOT:PSS; conjugated polymer; single-particle spectroscopy; microresonators
类别
资金
- National Science Foundation [DMR-1610345, CMMI-1462771]
- National Science Foundation through the University of Wisconsin Materials Research Science and Engineering Center (MRSEC) [DMR-1121288]
- Center for Excitonics, an Energy Frontier Research Center - U.S. Department of Energy [DE-SC0001088]
- U.S. Department of Energy [DE-FG02-09ER46664]
- Direct For Mathematical & Physical Scien [1610345] Funding Source: National Science Foundation
- Div Of Civil, Mechanical, & Manufact Inn [1462771] Funding Source: National Science Foundation
PEDOT:PSS, a transparent electrically conductive polymer, finds widespread use in electronic devices. While empirical efforts have increased conductivity, a detailed understanding of the coupled electronic and morphological landscapes in PEDOT:PSS has lagged due to substantial structural heterogeneity on multiple length-scales. We use an optical microresonator-based absorption spectrometer to perform single-particle measurements, providing a bottom-up examination of electronic structure and morphology ranging from single PEDOT:PSS polymers to nascent films. Using single-particle spectroscopy with complementary theoretical calculations and ultrafast spectroscopy, we demonstrate that PEDOT:PSS displays bulk-like optical response even in single polymers. We find highly ordered PEDOT assemblies with long-range ordering mediated by the insulating PSS matrix and reveal a preferential surface orientation of PEDOT nanocrystallites absent in bulk films with implications for interfacial electronic communication. Our single-particle perspective provides a unique window into the microscopic structure and electronic properties of PEDOT:PSS.
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