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Triplet Harvesting from Intramolecular Singlet Fission in Polytetracene

Journal Article · · Advanced Materials
 [1];  [1];  [1];  [2];  [3];  [1]
  1. Department of Chemistry Columbia University New York NY 10027 USA
  2. Center for Functional Nanomaterials Brookhaven National Laboratory Upton NY 11973 USA
  3. Energy Frontier Research Center for Excitonics Massachusetts Institute of Technology Cambridge MA 02139 USA

Abstract

Singlet fission (SF), a promising mechanism of multiple exciton generation, has only recently been engineered as a fast, efficient, intramolecular process (iSF). The challenge now lies in designing and optimizing iSF materials that can be practically applied in high‐performance optoelectronic devices. However, most of the reported iSF systems, such as those based on donor–acceptor polymers or pentacene, have low triplet energies, which limits their applications. Tetracene‐based materials can overcome significant challenges, as the tetracene triplet state is practically useful, ≈1.2 eV. Here, the synthesis and excited state dynamics of a conjugated tetracene homopolymer are studied. This polymer undergoes ultrafast iSF in solution, generating high‐energy triplets on a sub‐picosecond time scale. Magnetic‐field‐dependent photocurrent measurements of polytetracene‐based devices demonstrate the first example of iSF‐generated triplet extraction in devices, exhibiting the potential of iSF materials for use in next‐generation devices.

Sponsoring Organization:
USDOE
Grant/Contract Number:
SC0001088; SC0012704; AC02-05CH11231
OSTI ID:
1390391
Journal Information:
Advanced Materials, Journal Name: Advanced Materials Journal Issue: 41 Vol. 29; ISSN 0935-9648
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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