Journal
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
Volume 134, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.physe.2021.114840
Keywords
External electric field; Manipulate; Sequential charge transfer; Super-exchange charge transfer; Two-photon absorption
Funding
- National Natural Science Foundation of China [91436102, 11374353]
- Fundamental Research Funds for the Central Universities [06500067]
- NSFC-BRICS STI (National Natural Science Foundation of China, BRICS on Science, Technology and Innovation) [51861145309]
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This paper investigates the effects of external electric fields on sequential and super-exchange charge transfer in D-B-A systems, showing that the orientation and absorption strength of charge transfer excitons can be manipulated effectively. The results provide new opportunities for achieving strong absorption with different charge transfer characteristics in TPA, highlighting the role of external electric fields in controlling charge transfer processes.
In this paper, we report external electric field manipulates sequential and super-exchange charge transfer in donor-bridge-acceptor (D-B-A) system in two-photon absorption (TPA). Our results reveal that the orientation and absorption strength of sequential and super-exchange charge transfer excitons can be well manipulated in DB-A system in TPA. The energy levels and absorption intensity of electronic transitions in one-photon absorption (OPA), as the intermediate state in TPA, are strongly influenced by external electric field, which provides a great opportunity for strong absorption with different charge transfer characteristics in TPA of D-B-A. Also, the optical properties of lowest charge transfer excited state under different external electric fields are also investigated in OPA. Our results can provide deeper understanding of external electric field in controlling sequential and superexchange charge transfer in D-B-A system in TPA.
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