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A new metal transfer process for van der Waals contacts to vertical Schottky-junction transition metal dichalcogenide photovoltaics

Went, Cora M. and Wong, Joeson and Jahelka, Phillip R. and Kelzenberg, Michael and Biswas, Souvik and Atwater, Harry A. (2019) A new metal transfer process for van der Waals contacts to vertical Schottky-junction transition metal dichalcogenide photovoltaics. . (Unpublished)

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Two-dimensional transition metal dichalcogenides are promising candidates for ultrathin optoelectronic devices due to their high absorption coefficients and intrinsically passivated surfaces. To maintain these near-perfect surfaces, recent research has focused on fabricating contacts that limit Fermi-level pinning at the metal-semiconductor interface. Here, we develop a new, simple procedure for transferring metal contacts that does not require aligned lithography. Using this technique, we fabricate vertical Schottky-junction WS_2 solar cells with Ag and Au as asymmetric work function contacts. Under laser illumination, we observe rectifying behavior and open-circuit voltage above 500 mV in devices with transferred contacts, in contrast to resistive behavior and open-circuit voltage below 15 mV in devices with evaporated contacts. One-sun measurements and device simulation results indicate that this metal transfer process could enable high-specific-power vertical Schottky-junction transition metal dichalcogenide photovoltaics, and we anticipate that this technique will lead to advances for two-dimensional devices more broadly.

Item Type:Report or Paper (Discussion Paper)
Related URLs:
URLURL TypeDescription Paper
Wong, Joeson0000-0002-6304-7602
Atwater, Harry A.0000-0001-9435-0201
Alternate Title:Transferred metal contacts for vertical Schottky-junction transition metal dichalcogenide photovoltaics
Additional Information:This work was supported by the DOE ‘Photonics at Thermodynamic Limits’ Energy Frontier Research Center under grant DE-SC0019140. C.M.W. and J.W. acknowledge support from the National Science Foundation Graduate Research Fellowship under grants 1745301 and 1144469. C.M.W. acknowledges fellowship support from the Resnick Institute. The authors thank Sungwoo Nam for useful discussions. Author contributions: C.M.W. fabricated the devices, performed the measurements, and performed the simulations. C.M.W., J.W., P.R.J., and S.B. developed the metal transfer technique. J.W. and P.R.J. assisted with the simulations. M.K. assisted with the solar simulator, absorption, and EQE measurements. H.A.A. supervised all experiments, calculations, and data collection. All authors contributed to data interpretation, presentation, and writing of the manuscript.
Group:JCAP, Resnick Sustainability Institute
Funding AgencyGrant Number
Department of Energy (DOE)DE-SC0019140
NSF Graduate Research FellowshipDGE-1745301
NSF Graduate Research FellowshipDGE-1144469
Resnick Sustainability InstituteUNSPECIFIED
Record Number:CaltechAUTHORS:20190513-082509112
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:95420
Deposited By: Tony Diaz
Deposited On:13 May 2019 16:27
Last Modified:13 May 2019 16:27

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