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Article: Optically Probing Field-Dependent Charge Dynamics in Non-Fullerene Organic Photovoltaics with Small Interfacial Energy Offsets

TitleOptically Probing Field-Dependent Charge Dynamics in Non-Fullerene Organic Photovoltaics with Small Interfacial Energy Offsets
Authors
Issue Date2021
PublisherAmerican Chemical Society. The Journal's web site is located at http://pubs.acs.org/journals/jpccck/
Citation
The Journal of Physical Chemistry C, 2021, v. 125 n. 3, p. 1714-1722 How to Cite?
AbstractCurrent non-fullerene organic photovoltaics (OPVs) can achieve high photocurrent generation yields with small donor/acceptor energy offsets. However, the effect of varying energy offset on the charge dynamics in these systems is not fully understood. Here, we use optical spectroscopy to probe charge dynamics in three model non-fullerene systems with varying energy offsets. We find that systems with marginal and negative energy offsets show low photocurrent generation yields and significant radiative recombination from the exciton state. Improved photocurrent generation and suppressed exciton emission is observed when the device is under reverse bias. Our results indicate that photoexcitation of these systems leads to bound charge pairs at the donor/acceptor interface which tend to recombine via the singlet exciton state unless their separation is facilitated by external electric fields. Our results shed light on the charge separation and recombination dynamics in non-fullerene OPVs with small donor/acceptor energy offsets.
Persistent Identifierhttp://hdl.handle.net/10722/301908
ISSN
2023 Impact Factor: 3.3
2023 SCImago Journal Rankings: 0.957
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorZou, X-
dc.contributor.authorMa, C-
dc.contributor.authorChan, CCS-
dc.contributor.authorZhang, J-
dc.contributor.authorLi, Y-
dc.contributor.authorShang, A-
dc.contributor.authorWang, Z-
dc.contributor.authorArunagiri, L-
dc.contributor.authorQi, Z-
dc.contributor.authorAde, H-
dc.contributor.authorYan, H-
dc.contributor.authorWong, KS-
dc.contributor.authorChow, PCY-
dc.date.accessioned2021-08-21T03:28:46Z-
dc.date.available2021-08-21T03:28:46Z-
dc.date.issued2021-
dc.identifier.citationThe Journal of Physical Chemistry C, 2021, v. 125 n. 3, p. 1714-1722-
dc.identifier.issn1932-7447-
dc.identifier.urihttp://hdl.handle.net/10722/301908-
dc.description.abstractCurrent non-fullerene organic photovoltaics (OPVs) can achieve high photocurrent generation yields with small donor/acceptor energy offsets. However, the effect of varying energy offset on the charge dynamics in these systems is not fully understood. Here, we use optical spectroscopy to probe charge dynamics in three model non-fullerene systems with varying energy offsets. We find that systems with marginal and negative energy offsets show low photocurrent generation yields and significant radiative recombination from the exciton state. Improved photocurrent generation and suppressed exciton emission is observed when the device is under reverse bias. Our results indicate that photoexcitation of these systems leads to bound charge pairs at the donor/acceptor interface which tend to recombine via the singlet exciton state unless their separation is facilitated by external electric fields. Our results shed light on the charge separation and recombination dynamics in non-fullerene OPVs with small donor/acceptor energy offsets.-
dc.languageeng-
dc.publisherAmerican Chemical Society. The Journal's web site is located at http://pubs.acs.org/journals/jpccck/-
dc.relation.ispartofThe Journal of Physical Chemistry C-
dc.rightsThis document is the Accepted Manuscript version of a Published Work that appeared in final form in [JournalTitle], copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see [insert ACS Articles on Request author-directed link to Published Work, see http://pubs.acs.org/page/policy/articlesonrequest/index.html].-
dc.titleOptically Probing Field-Dependent Charge Dynamics in Non-Fullerene Organic Photovoltaics with Small Interfacial Energy Offsets-
dc.typeArticle-
dc.identifier.emailChow, PCY: pcyc@hku.hk-
dc.identifier.authorityChow, PCY=rp02699-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1021/acs.jpcc.0c09663-
dc.identifier.scopuseid_2-s2.0-85100270704-
dc.identifier.hkuros324167-
dc.identifier.volume125-
dc.identifier.issue3-
dc.identifier.spage1714-
dc.identifier.epage1722-
dc.identifier.isiWOS:000614317500010-
dc.publisher.placeUnited States-

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