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High Photovoltaic Quantum Efficiency in Ultrathin van der Waals Heterostructures
Joeson Wong1, Deep Jariwala1, Giulia Tagliabue1
1Department of Applied Physics and Materials Science, ‡Resnick Sustainability Institute, §Kavli Nanoscience Institute, and ∥Joint Center for Artificial Photosynthesis, California Institute of Technology , Pasadena, California 91125, United States.
Abstract:
We report experimental measurements for ultrathin (<15 nm) van der Waals heterostructures exhibiting external quantum efficiencies exceeding 50% and show that these structures can achieve experimental absorbance >90%. By coupling electromagnetic simulations and experimental measurements, we show that pn WSe2/MoS2 heterojunctions with vertical carrier collection can have internal photocarrier collection efficiencies exceeding 70%.

