Effect of the Interfacial Energy Landscape on Photoinduced Charge Generation at the ZnPc/MoS2 Interface

TR Kafle, B Kattel, P Yao, P Zereshki… - Journal of the …, 2019 - ACS Publications
Monolayer transition-metal dichalcogenide crystals (TMDC) can be combined with other
functional materials, such as organic molecules, to form a wide range of heterostructures …

Long-range hot charge transfer exciton dissociation in an organic/2D semiconductor hybrid excitonic heterostructure

Z Wang, C Sun, X Xu, Y Liu, Z Chen… - Journal of the …, 2023 - ACS Publications
Whether and how an electron–hole pair at the donor–acceptor interface separates from their
mutual Coulombic interaction has been a long-standing question for both fundamental …

Enthalpy-uphill exciton dissociation in organic/2D heterostructures promotes free carrier generation

F Rudayni, K Rijal, N Fuller, WL Chan - Materials Horizons, 2024 - pubs.rsc.org
Despite the large binding energy of charge transfer (CT) excitons in type-II organic/2D
heterostructures, it has been demonstrated that free carriers can be generated from CT …

Hybrid heterostructures to generate long-lived and mobile photocarriers in graphene

P Valencia-Acuna, F Rudayni, K Rijal, WL Chan… - ACS …, 2023 - ACS Publications
We report the generation of long-lived and highly mobile photocarriers in hybrid van der
Waals heterostructures that are formed by monolayer graphene, few-layer transition metal …

Suppressing Polaronic Defect–Photocarrier Interaction in Halide Perovskites by Pre-distorting Its Lattice

G Alkhalifah, B Wang, OV Prezhdo… - Journal of the American …, 2025 - ACS Publications
In halide perovskites, photocarriers can have strong polaronic interactions with point defects.
For iodide-deficient MAPbI3, we found that the Fermi level can shift significantly by 0.6–0.7 …

Spontaneous exciton dissociation at organic semiconductor interfaces facilitated by the orientation of the delocalized electron–hole wavefunction

TR Kafle, B Kattel, S Wanigasekara… - Advanced Energy …, 2020 - Wiley Online Library
In organic semiconductors, optical excitation does not necessarily produce free carriers.
Very often, electron and hole are bound together to form an exciton. Releasing free carriers …

The relationship between the coherent size, binding energy and dissociation dynamics of charge transfer excitons at organic interfaces

TR Kafle, B Kattel, T Wang… - Journal of Physics …, 2018 - iopscience.iop.org
At organic semiconductor interfaces, an electron and a hole can be bound Coulombically to
form an interfacial charge transfer (CT) exciton. It is still under debate how a CT exciton can …

Ultrafast and Long-Range Energy Transfer from Plasmon to Molecular Exciton

F Rudayni, TR Kafle, J Waters, K Rijal… - The Journal of Physical …, 2023 - ACS Publications
By using a model interface consisting of a metallic grating and zinc phthalocyanine (ZnPc)
molecules, we temporally and spatially resolve the energy transfer process from plasmon to …

Exciton Heating Versus Cooling: Charge Separation Driven by Entropy and Delocalization at Interfaces with Planar Molecules

TR Kafle, WL Chan - Physical Review Applied, 2021 - APS
The recent development of nonfullerene acceptors (NFAs) has resulted in an abrupt
increase in the organic photovoltaic (OPV) efficiency. It remains unclear why charge …

Using an Atomically Thin Layer of Hexagonal Boron Nitride to Separate Bound Charge-Transfer Excitons at Organic Interfaces

S Wanigasekara, K Rijal, F Rudayni, M Panth… - Physical Review …, 2022 - APS
We successfully use two-dimensional hexagonal boron nitride (h-BN) as a continuous and
ultrathin insulator to facilitate the conversion of excitons into free carriers at organic donor …