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Boosting internal quantum efficiency via ultrafast triplet transfer to 2H-MoTe2 film

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Title
Boosting internal quantum efficiency via ultrafast triplet transfer to 2H-MoTe2 film
Author(s)
Yu Jin Jang; Kamal Kumar Paul; Jin Cheol Park; Meeree Kim; Minh Dao Tran; Hyun Yong Song; Seok Joon Yun; Hyoyoung Lee; Enkhbat, Temujin; Kim, JunHo; Young Hee Lee; Ji-Hee Kim
Publication Date
2023-06
Journal
Science advances, v.9, no.25, pp.eadg2324
Publisher
NLM (Medline)
Abstract
Organic systems often allow to create two triplet spin states (triplet excitons) by converting an initially excited singlet spin state (a singlet exciton). An ideally designed organic/inorganic heterostructure could reach the photovoltaic energy harvest over the Shockley-Queisser (S-Q) limit because of the efficient conversion of triplet excitons into charge carriers. Here, we demonstrate the molybdenum ditelluride (MoTe2)/pentacene heterostructure to boost the carrier density via efficient triplet transfer from pentacene to MoTe2 using ultrafast transient absorption spectroscopy. We observe carrier multiplication by nearly four times by doubling carriers in MoTe2 via the inverse Auger process and subsequently doubling carriers via triplet extraction from pentacene. We also verify efficient energy conversion by doubling the photocurrent in the MoTe2/pentacene film. This puts a step forward to enhancing photovoltaic conversion efficiency beyond the S-Q limit in the organic/inorganic heterostructures. © 2023 American Association for the Advancement of Science.
URI
https://pr.ibs.re.kr/handle/8788114/13759
DOI
10.1126/sciadv.adg2324
ISSN
2375-2548
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > 1. Journal Papers (저널논문)
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