Ultrafast Exciton Dissociation at the 2D-WS2 Monolayer/Perovskite Interface

Bauer, Joshua; Quintanar, Leo Scott; Wang, Kai; Puretzky, Alexander; Xiao, Kai; Geohegan, David; Boulesbaa, Abdelaziz

doi:10.1021/acs.jpcc.8b08183

Ultrafast Exciton Dissociation at the 2D-WS₂ Monolayer/Perovskite Interface

Journal Article · Wed Nov 28 23:00:00 EST 2018 · Journal of Physical Chemistry. C

DOI:https://doi.org/10.1021/acs.jpcc.8b08183· OSTI ID:1607233

Bauer, Joshua ^[1]; Quintanar, Leo Scott ^[1]; Wang, Kai ^[2]; ^[2]; ^[2]; ^[2]; ^[1]

California State Univ., Northridge, CA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

For an excitonic photovoltaic (PV) device to perform efficiently, photogenerated excitons in the charge donor need to be dissociated through charge transfer (CT) to the acceptor rapidly after their photogeneration and remain separated for a longer time to allow the collection of charges. To improve the efficiency of these steps, several combinations of materials have been examined. Due to their excellent optical properties, two-dimensional transition-metal dichalcogenides (2D-TMDs) have recently been explored. Another promising class of materials to platform efficient PVs is organic–inorganic perovskites. Here, we report on the ultrafast exciton dissociation through electron transfer from a 2D tungsten disulfide (WS₂) monolayer to a thin layer of methylammonium lead iodide (CH₃NH₃PbI₃) perovskites. Photoluminescence measurements showed that when the 2D-WS₂ monolayer was covered with perovskites, its emission completely quenched, suggesting that the CT process is highly efficient. Despite that pump–probe spectroscopy measurements were carried out with a ~45 fs temporal resolution, the CT dynamics were not captured. A comparison of the ultrafast dynamics of the two band-edge excitons of the charge donor (2D-WS₂) suggested that electron transfer is the dominant pathway of CT. Furthermore, these pump–probe measurements indicated that a small fraction of transferred electrons remained in the perovskites up to almost 2 ns. These findings may open a new horizon for understanding the dissociation of photogenerated excitons in 2D-TMDs through hybridization with another class of nanomaterials.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1607233

Journal Information:: Journal of Physical Chemistry. C, Journal Name: Journal of Physical Chemistry. C Journal Issue: 50 Vol. 122; ISSN 1932-7447

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
charge transfer
excitons
hole transfer
monolayers
perovskites