Tsokkou, Dimitra; Cheng, Chiao-Yu; Krainova, Nina; Mukhopadhyay, Sukrit; Giebink, Noel C.; Banerji, Natalie (2021). Data related to manuscript ['Ultrafast Charge Transfer Dynamics at the Origin of Photoconductivity in Doped Organic Solids', The Journal of Physical Chemistry C (2021), https://doi.org/10.1021/acs.jpcc.1c01990] [Dataset]. 10.1021/acs.jpcc.1c01990
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In spite of their growing importance for optoelectronic devices, the fundamental properties and photophysics of molecularly doped organic solids remain poorly understood. Such doping typically leads to a small fraction of free conductive charges, with most electronic carriers remaining Coulombically bound to the ionized dopant. Recently, we have reported photocurrent for devices containing vacuum-deposited TAPC (1,1-bis(4-bis(4-methylphenyl)aminophenyl)cyclohexane) doped with MoO3, showing that photoexcitation of charged TAPC molecules increases the concentration of free holes that contribute to conduction. Here, we elucidate the excited-state dynamics of such doped TAPC films to unravel the key mechanisms responsible for this effect. We demonstrate that excitation of different electronic transitions in charged and neutral TAPC molecules allows bound holes to overcome the Coulombic attraction to their MoO3 counterions, resulting in an enhanced yield of long-lived free carriers. This is caused by ultrafast back-and-forth shuffling of charges and excitation energy between adjacent cations and neutral molecules, competing with relatively slow nonradiative decay from higher excited states of TAPC•+. The light-induced generation of conductive carriers requires the coexistence of cationic and neutral TAPC, a favorable energy level alignment, and intermolecular interactions in the solid state.
Item Type: |
Dataset |
|---|---|
Division/Institute: |
08 Faculty of Science > Department of Chemistry, Biochemistry and Pharmaceutical Sciences (DCBP) |
UniBE Contributor: |
Tsokkou, Dimitra, Banerji, Natalie |
Subjects: |
500 Science > 540 Chemistry |
Funders: |
[18] European Research Council ; [4] Swiss National Science Foundation ; [UNSPECIFIED] University of Bern |
Language: |
French |
Submitter: |
Olivier Nicolas Ludovic Bardagot |
Date Deposited: |
07 Jun 2021 16:16 |
Last Modified: |
05 Dec 2022 15:51 |
Publisher DOI: |
10.1021/acs.jpcc.1c01990 |
Related URLs: |
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Additional Information: |
This dataset contains the data published in manuscript ‘Ultrafast Charge Transfer Dynamics at the Origin of Photoconductivity in Doped Organic Solids’, J. Phys. Chem. C 2021, 125, 7086−7096, https://doi.org/10.1021/acs.jpcc.1c01990. The authors thank the funders: |
BORIS DOI: |
10.48350/156693 |
URI: |
https://boris.unibe.ch/id/eprint/156693 |
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