Exciton‐Mediated Energy Transfer in Heterojunction Enables Infrared Light Photocatalysis

Although a few semiconductors can directly absorb infrared light, their intrinsic properties like improper band‐edge position and strong electron–hole interaction restrict further photocatalytic applications. Herein, we propose an exciton‐mediated energy transfer strategy for realizing efficient inf...

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Bibliographic Details
Published in:Angewandte Chemie International Edition 2021-06, Vol.60 (23), p.12891-12896
Main Authors: Li, Yuanjin, Wang, Hui, Zhang, Xiaodong, Wang, Shuhui, Jin, Sen, Xu, Xiaoliang, Liu, Wenxiu, Zhao, Zhi, Xie, Yi
Format: Article
Language:English
Subjects:
black phosphorous
Carbon nitride
Current carriers
Electron-hole interaction
Electronics industry
Energy transfer
excitonic effects
Excitons
Heterojunctions
Heterostructures
I.R. radiation
Infrared radiation
infrared-light-driven photocatalysis
Irradiation
Light
Light irradiation
Photocatalysis
Photoexcitation
polymeric carbon nitride
Selectivity
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Summary:Although a few semiconductors can directly absorb infrared light, their intrinsic properties like improper band‐edge position and strong electron–hole interaction restrict further photocatalytic applications. Herein, we propose an exciton‐mediated energy transfer strategy for realizing efficient infrared light response in heterostructures. Using black phosphorous/polymeric carbon nitride (BP/CN) heterojunction, CN could be indirectly excited by infrared light with the aid of nonradiatively exciton‐based energy transfer from BP. At the same time, excitons are dissociated into free charge carriers at the interface of BP/CN heterojunction, followed by hole injection to BP and electron retainment in CN. As a result of these unique photoexcitation processes, BP/CN heterojunction exhibits promoted conversion rate and selectivity in amine–amine oxidative coupling reaction even under infrared light irradiation. This study opens a new way for the design of efficient infrared light activating photocatalysts. Under infrared‐light irradiation, black phosphorus (BP) is directly excited, and energy could be nonradiatively transferred to CN by exciton interactions. The indirectly generated excitons in CN would be dissociated into free electrons and holes at the interface of BP/CN heterojunction, followed by the injection of holes to BP and the accumulation of electrons in CN.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.202101090