Ultralow-Tensile Strain Enables Exciton Funneling and Energy Transfer to Boost MoSe2 Photoluminescence Quantum Yield
Year: 2026
Type: preprint
Abstract: Strain engineering is a powerful route for controlling the exciton dynamics in van der Waals (vdW) heterostructures (HSs). The interlayer energy transfer (ET) process is another key factor in controlling the photocarrier relaxation pathways in vdW HSs. In this work, we combine these two processes to achieve an 8-fold enhancement to the relative photoluminescence (PL) quantum yield (QY) in a HS formed from monolayers of ReS2 and MoSe2, separated by a thin hBN interlayer, placed onto an hBN bubble. We achieve this enhancement by applying only 0.1% biaxial tensile strain, which results in efficient exciton funneling and an increased transition dipole moment. Our experimental data are supported by first-principles density-functional theory and coherent transfer-matrix method calculations, ruling out optical interference as the dominant origin of the enhancement. This work provides an innovative route for enhancing the PL QY of vdW materials via interplay between the tensile strain and the ET process.
Source: arXiv (Cornell University)
Authors: Gayatri, Arfaoui, Mehdi, Das, Debashish, Raczyński, Mateusz, Bilska, Marta, Tatarczak, Piotr, Dąbrowska, Aleksandra Krystyna, Kazimierczuk, Tomasz, Taniguchi, Takashi, Watanabe, Kenji, Kossacki, Piotr, Wysmołek, Andrzej, Nayak, Saroj Kumar, Babiński, Adam, Binder, Johannes, Molas, Maciej R., Karmakar, Arka
Institutions: University of Warsaw, Centre National de la Recherche Scientifique, Commissariat à l'Énergie Atomique et aux Énergies Alternatives, Université Paris-Saclay, CEA Paris-Saclay - Etablissement de Saclay, Office National d'Études et de Recherches Aérospatiales, Laboratoire d'Étude des Microstructures, Indian Institute of Technology Bhubaneswar, National Institute for Materials Science, Research Center for Materials Nanoarchitectonics
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7213608320