Projects per year
Abstract
Fermi level control by doping is established since decades in inorganic semiconductors and has been successfully introduced in organic semiconductors. Despite its commercial success in the multi-billion OLED display business, molecular doping is little understood, with its elementary steps controversially discussed and mostly-empirical-materials design. Particularly puzzling is the efficient carrier release, despite a presumably large Coulomb barrier. Here we quantitatively investigate doping as a two-step process, involving single-electron transfer from donor to acceptor molecules and subsequent dissociation of the ground-state integer-charge transfer complex (ICTC). We show that carrier release by ICTC dissociation has an activation energy of only a few tens of meV, despite a Coulomb binding of several 100 meV. We resolve this discrepancy by taking energetic disorder into account. The overall doping process is explained by an extended semiconductor model in which occupation of ICTCs causes the classically known reserve regime at device-relevant doping concentrations
Original language | English |
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Article number | 1182 |
Journal | Nature Communications |
Volume | 9 |
DOIs | |
Publication status | Published - 2018 |
Fields of Expertise
- Advanced Materials Science
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Dive into the research topics of 'Elementary steps in electrical doping of organic semiconductors'. Together they form a unique fingerprint.Projects
- 2 Finished
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FWF - SAM - New design strategies for tuning electrode properties by SAMs
1/09/15 → 31/12/19
Project: Research project
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EU - THINFACE - Thin-film Hybrid Interfaces: a training initiative for the design of next-generation energy devices
1/09/13 → 31/08/17
Project: Research project