Abstract
Stack engineering, an atomic-scale metamaterial strategy, enables the design of optical and electronic properties in van der Waals heterostructure devices. Here we reveal the optoelectronic effects of stacking-induced strong coupling between atomic motion and interlayer excitons in WSe2/MoSe2 heterojunction photodiodes. To do so, we introduce the photocurrent spectroscopy of a stack-engineered photodiode as a sensitive technique for probing interlayer excitons, enabling access to vibronic states typically found only in molecule-like systems. The vibronic states in our stack are manifest as a palisade of pronounced periodic sidebands in the photocurrent spectrum in frequency windows close to the interlayer exciton resonances and can be shifted "on demand"through the application of a perpendicular electric field via a source-drain bias voltage. The observation of multiple well-resolved sidebands as well as their ability to be shifted by applied voltages vividly demonstrates the emergence of interlayer exciton vibronic structure in a stack-engineered optoelectronic device.
| Original language | English |
|---|---|
| Pages (from-to) | 5751-5758 |
| Number of pages | 8 |
| Journal | Nano Letters |
| Volume | 22 |
| Issue number | 14 |
| Early online date | 5 Jul 2022 |
| DOIs | |
| Publication status | Published - 27 Jul 2022 |
Bibliographical note
Funding Information:The authors acknowledge valuable discussions with Vasili Perebeinos. This work was supported by the Army Research Office Electronics Division Award no. W911NF2110260 (N.M.G., V.A., and T.B.A.), the Presidential Early Career Award for Scientists and Engineers (PECASE) through the Air Force Office of Scientific Research (award no. FA9550-20-1-0097; N.M.G. and T.B.A.), through support from the National Science Foundation Division of Materials Research CAREER Award (no. 1651247; N.M.G. and F.B.), and through the United States Department of the Navy Historically Black Colleges, Universities and Minority Serving Institutions (HBCU/MI) award no. N00014-19-1-2574 (N.M.G. and F.B.). T.B.A. acknowledges support from the Fellowships and Internships in Extremely Large Data Sets (FIELDS) program, a NASA MUREP Institutional Research Opportunity (MIRO) program (grant no. NNX15AP99A). R.v.G. acknowledges institutional support from the Royal Netherlands Academy of Arts and Sciences (KNAW) and the Canadian Institute of Solar Energy Research (CEA). J.C.W.S. acknowledges support from the Singapore Ministry of Education under its MOE AcRF Tier 3 Award (MOE2018-T3-1-002). M.S.R is grateful for the support of the European Research Council (ERC) under the European Union Horizon 2020 Research and Innovation Programme (grant agreement no. 678862) and the Villum Foundation. R.K.L. and S.S. acknowledge support from the NSF (EFRI-1433395). This work used the Extreme Science and Engineering Discovery Environment (XSEDE), which is supported by National Science Foundation grant no. ACI-1053575 and allocation ID TG-DMR130081.
Publisher Copyright:
© 2022 American Chemical Society.
Funding
The authors acknowledge valuable discussions with Vasili Perebeinos. This work was supported by the Army Research Office Electronics Division Award no. W911NF2110260 (N.M.G., V.A., and T.B.A.), the Presidential Early Career Award for Scientists and Engineers (PECASE) through the Air Force Office of Scientific Research (award no. FA9550-20-1-0097; N.M.G. and T.B.A.), through support from the National Science Foundation Division of Materials Research CAREER Award (no. 1651247; N.M.G. and F.B.), and through the United States Department of the Navy Historically Black Colleges, Universities and Minority Serving Institutions (HBCU/MI) award no. N00014-19-1-2574 (N.M.G. and F.B.). T.B.A. acknowledges support from the Fellowships and Internships in Extremely Large Data Sets (FIELDS) program, a NASA MUREP Institutional Research Opportunity (MIRO) program (grant no. NNX15AP99A). R.v.G. acknowledges institutional support from the Royal Netherlands Academy of Arts and Sciences (KNAW) and the Canadian Institute of Solar Energy Research (CEA). J.C.W.S. acknowledges support from the Singapore Ministry of Education under its MOE AcRF Tier 3 Award (MOE2018-T3-1-002). M.S.R is grateful for the support of the European Research Council (ERC) under the European Union Horizon 2020 Research and Innovation Programme (grant agreement no. 678862) and the Villum Foundation. R.K.L. and S.S. acknowledge support from the NSF (EFRI-1433395). This work used the Extreme Science and Engineering Discovery Environment (XSEDE), which is supported by National Science Foundation grant no. ACI-1053575 and allocation ID TG-DMR130081.
| Funders | Funder number |
|---|---|
| Canadian Institute of Solar Energy Research | |
| HBCU/MI | N00014-19-1-2574 |
| United States Department of the Navy Historically Black Colleges, Universities and Minority Serving Institutions | |
| National Science Foundation | TG-DMR130081, EFRI-1433395, ACI-1053575 |
| Division of Materials Research | 1651247 |
| National Aeronautics and Space Administration | NNX15AP99A |
| Air Force Office of Scientific Research | FA9550-20-1-0097 |
| Army Research Office | W911NF2110260 |
| Villum Fonden | |
| Horizon 2020 Framework Programme | |
| European Research Council | |
| Ministry of Education - Singapore | MOE2018-T3-1-002 |
| Koninklijke Nederlandse Akademie van Wetenschappen | |
| Horizon 2020 | 678862 |
Keywords
- interlayer excitons
- photocurrent
- stack engineering
- van der Waals heterostructures
- vibronic
