High Photovoltaic Quantum Efficiency in Ultrathin van der Waals Heterostructures
classification
❄️ cond-mat.mes-hall
cond-mat.mtrl-sciphysics.app-phphysics.optics
keywords
experimentalcollectionefficienciesexceedingheterostructuresmeasurementsquantumultrathin
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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%.
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