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Updated: Jan 22, 2026

Absolute Quantum Yield Measurement of Powder Samples
Published on: May 12, 2012
WO3-WS2 Vertical Bilayer Heterostructures with High Photoluminescence Quantum Yield
Biyuan Zheng1,2, Weihao Zheng2, Ying Jiang2
1Key Laboratory for Micro-Nano Physics and Technology of Hunan Province, State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Materials Science and Engineering , Hunan University , Changsha , Hunan 410082 , People's Republic of China.
Abstract:
Atomically thin two-dimensional (2D) transition metal dichalcogenides (TMDCs) are attractive for applications in a wide range of optoelectronic devices, due to their tremendous interesting physical properties. However, the photoluminescence quantum yield (PLQY) of TMDCs has been found to be too low, due to abundant defects and strong many-body effect. Here, we present a direct physical vapor growth of WO3-WS2 bilayer heterostructures, with WO3 monolayer domains attached on the surface of large-size WS2 monolayers. Optical characterizations revealed that the PLQY of the as-grown WO3-WS2 heterostructures can reach up to 11.6%, which is 2 orders of magnitude higher than that of WS2 monolayers by the physical vapor deposition growth method (PVD-WS2) and about 13-times higher than that of mechanical exfoliated WS2 (ME-WS2) monolayers, representing the highest PLQY reported for direct growth TMDCs materials so far. The PL enhancement mechanism has been well investigated by time-resolved optical measurements. The fabrication of WO3-WS2 heterostructures with ultrahigh PLQY provides an efficient approach for the development of highly efficient 2D integrated photonic applications.
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