Giant exciton-enhanced shift currents and direct current conduction with subbandgap photo excitations produced by many-electron interactions
[1];
- Department of Physics, University of California, Berkeley, CA 94720-7300,, Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720,, Institute of Atomic and Molecular Sciences, Academia Sinica, 10617 Taipei, Taiwan
- Department of Physics, University of California, Berkeley, CA 94720-7300,, Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720,
Significance Shift current, a bulk photovoltaic effect, arises from nonlinear light–matter interaction in a noncentrosymmetric crystal under continuous wave illumination. Although it is a promising mechanism for photocurrent generation without p–n junctions, the short-circuit current (which is related to the power efficiency of a solar cell device) is usually low. It is therefore important to understand the physics of the phenomenon and find materials with strong shift current conductivity. We calculate the shift current conductivity including excitonic effects in a real material (monolayer GeS) from first principles. We show that electron–hole interactions can dramatically enhance and qualitatively change shift current in reduced-dimensional materials. Our results indicate low-dimensional materials are promising candidates for next-generation photovoltaic devices with high efficiencies.
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- AC02-05CH11231
- OSTI ID:
- 1797881
- Journal Information:
- Proceedings of the National Academy of Sciences of the United States of America, Journal Name: Proceedings of the National Academy of Sciences of the United States of America Journal Issue: 25 Vol. 118; ISSN 0027-8424
- Publisher:
- Proceedings of the National Academy of SciencesCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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