Trap-Filling Magnetoconductance as an Initialization and Readout Mechanism of Triplet Exciton Spins

Taylor Wagner, Justin Johnson, Obadiah Reid

Research output: Contribution to journalArticlepeer-review

2 Scopus Citations

Abstract

Photoexcited triplet states are promising candidates for hybrid qubit systems, as they can be used as a controlling gate for nuclear spins. But microwave readout schemes do not generally offer the sensitivity needed to approach the single-molecule limit or the scope to integrate such systems into devices. Here, we demonstrate the possibility of electrical readout of triplet spins at room temperature through a specific mechanism of magnetoconductance (MC) in polycrystalline pentacene. We show that hole-only pentacene devices exhibit a positive photoinduced MC response that is consistent with a trap-filling mechanism. Spin and magnetic-field-dependent quenching of photogenerated triplets by holes quantitatively explains the MC response we observe. These results are distinct in both sign and proposed mechanism compared to previous reports on polyacene materials and provide clear design rules for future spintronic devices based on this spin-sensing mechanism.

Original languageAmerican English
Pages (from-to)9895-9902
Number of pages8
JournalJournal of Physical Chemistry Letters
Volume13
Issue number42
DOIs
StatePublished - 2022

Bibliographical note

Publisher Copyright:
© 2022 American Chemical Society. All rights reserved.

NREL Publication Number

  • NREL/JA-5900-83379

Keywords

  • magnetoresistance
  • organic
  • quantum
  • singlet fission

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