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Charge Transfer in ...
Charge Transfer in the P(g42T-T) : BBL Organic Polymer Heterojunction Measured with Core-Hole Clock Spectroscopy
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- Berggren, Elin (author)
- Uppsala universitet,Institutionen för fysik och astronomi,Röntgenfysik,Uppsala Univ, Sweden
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- Weng, Yi-Chen (author)
- Uppsala universitet,Institutionen för fysik och astronomi,Röntgenfysik,Uppsala Univ, Sweden
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- Li, Qifan (author)
- Linköpings universitet,Laboratoriet för organisk elektronik,Tekniska fakulteten
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- Yang, Chi-Yuan (author)
- Linköping Univ, Dept Sci & Technol, Lab Organ Elect, SE-60174 Norrköping, Sweden.
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- Johansson, Fredrik (author)
- KTH,Tillämpad fysikalisk kemi,KTH Royal Inst Technol, Dept Chem, Div Appl Phys Chem, SE-10044 Stockholm, Sweden.;Sorbonne Univ, Inst Nanosci Paris, CNRS, INSP, F-75005 Paris, France.
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- Cappel, Ute B. (author)
- KTH,Tillämpad fysikalisk kemi,KTH Royal Inst Technol, Dept Chem, Div Appl Phys Chem, SE-10044 Stockholm, Sweden.
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- Berggren, Magnus (author)
- Linköpings universitet,Laboratoriet för organisk elektronik,Tekniska fakulteten
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- Fabiano, Simone (author)
- Linköpings universitet,Laboratoriet för organisk elektronik,Tekniska fakulteten
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- Lindblad, Andreas, Lecturer, 1978- (author)
- Uppsala universitet,Energimaterialens fysik,Uppsala Univ, Sweden
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- Yang, Chiyuan (author)
- Linköpings universitet,Laboratoriet för organisk elektronik,Tekniska fakulteten
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(creator_code:org_t)
- American Chemical Society (ACS), 2023
- 2023
- English.
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In: The Journal of Physical Chemistry C. - : American Chemical Society (ACS). - 1932-7447 .- 1932-7455. ; 127:49, s. 23733-23742
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Abstract
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- The conductivity of organic polymer heterojunction devices relies on the electron dynamics occurring along interfaces between the acceptor and donor moieties. To investigate these dynamics with chemical specificity, spectroscopic techniques are employed to obtain localized snapshots of the electron behavior at selected interfaces. In this study, charge transfer in blends (by weight 10, 50, 90, and 100%) of p-type polymer P(g(4)2T-T) (bithiophene-thiophene) and n-type polymer BBL (poly(benzimidazo-benzo-phenanthroline)) was measured by resonant Auger spectroscopy. Electron spectra emanating from the decay of core-excited states created upon X-ray absorption in the donor polymer P(g(4)2T-T) were measured in the sulfur KL2,3L2,3 Auger kinetic energy region as a function of the excitation energy. By tuning the photon energy across the sulfur K-absorption edge, it is possible to differentiate between decay paths in which the core-excited electron remained on the atom with the core-hole and those where it tunneled away. Analyzing the competing decay modes of these localized and delocalized (charge-transfer) processes facilitated the computation of charge-transfer times as a function of excitation energy using the core-hole clock method. The electron delocalization times derived from the measurements were found to be in the as/fs regime for all polymer blends, with the fastest charge transfer occurring in the sample with an equal amount of donor and acceptor polymer. These findings highlight the significance of core-hole clock spectroscopy as a chemically specific tool for examining the local charge tunneling propensity, which is fundamental to understanding macroscopic conductivity. Additionally, the X-ray absorption spectra near the sulfur K-edge in the P(g(4)2T-T) polymer for different polymer blends were analyzed to compare molecular structure, orientation, and ordering in the polymer heterojunctions. The 50% donor sample exhibited the most pronounced angular dependence of absorption, indicating a higher level of ordering compared to the other weight blends. Our studies on the electron dynamics of this type of all-polymer donor-acceptor systems, in which spontaneous ground-state electron transfer occurs, provide us with critical insights to further advance the next generation of organic conductors with mixed electron-hole conduction characteristics suitable for highly stable electrodes of relevance for electronic, electrochemical, and optoelectronic applications.
Subject headings
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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Berggren, Elin
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Weng, Yi-Chen
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Li, Qifan
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Yang, Chi-Yuan
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Johansson, Fredr ...
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Cappel, Ute B.
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Berggren, Magnus
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Fabiano, Simone
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Lindblad, Andrea ...
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Yang, Chiyuan
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- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Condensed Matter ...
- Articles in the publication
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The Journal of P ...
- By the university
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Royal Institute of Technology
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Uppsala University
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Linköping University