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Published July 25, 2017 | Version Supplemental Material + Submitted
Journal Article Open

High Photovoltaic Quantum Efficiency in Ultrathin van der Waals Heterostructures

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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 Wse_2/MoS_2 heterojunctions with vertical carrier collection can have internal photocarrier collection efficiencies exceeding 70%.

Additional Information

© 2017 American Chemical Society. Received: May 6, 2017; Accepted: June 2, 2017; Publication Date (Web): June 7, 2017. This work is part of the "Light-Material Interactions in Energy Conversion" Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under award no. DE-SC0001293. D.J., A.R.D., and M.C.S. acknowledge additional support from the Space Solar Power project and the Resnick Sustainability Institute Graduate and Postdoctoral Fellowships. A.R.D. also acknowledges support in part from the Kavli Nanoscience Institute Postdoctoral Fellowship. G.T. acknowledges support in part from the Swiss National Science Foundation, Early Postdoc Mobility Fellowship no. P2EZP2_159101. J.W. acknowledges support from the National Science Foundation Graduate Research Fellowship under grant no. 1144469. K.T. would like to thank the Caltech SURF program and the Northrop Grumman Corporation for financial support. Author Contributions: These authors contributed equally. J.W. and D.J. prepared the samples and fabricated the devices. J.W. and A. R. D. performed the calculations. J.W., D.J., and G.T. performed the measurements. K.T. and M.C.S. assisted with sample preparation and fabrication. H.A.A. supervised over all the experiments, calculations, and data collection. The authors declare no competing financial interest.

Attached Files

Submitted - 1706.02700.pdf

Supplemental Material - nn7b03148_si_001.pdf

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1706.02700.pdf

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Additional details

Identifiers

Eprint ID
78091
DOI
10.1021/acsnano.7b03148
Resolver ID
CaltechAUTHORS:20170612-090309097

Related works

Describes
https://arxiv.org/abs/1706.02700 (URL)

Funding

Department of Energy (DOE)
DE-SC0001293
Space Solar Power Project
Resnick Sustainability Institute
Kavli Nanoscience Institute
Swiss National Science Foundation (SNSF)
P2EZP2_159101
NSF Graduate Research Fellowship
DGE-1144469
Caltech Summer Undergraduate Research Fellowship (SURF)
Northrop Grumman Corporation

Dates

Created
2017-06-12
Created from EPrint's datestamp field
Updated
2021-11-15
Created from EPrint's last_modified field

Caltech Custom Metadata

Caltech groups
Resnick Sustainability Institute, Kavli Nanoscience Institute, Space Solar Power Project