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Flexo-photovoltaic effect in MoS2.

Jie Jiang1, Zhizhong Chen2, Yang Hu2

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|June 18, 2021
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Scientists demonstrated the flexo-photovoltaic effect in molybdenum disulfide (MoS2) using strain-gradient engineering. This strain-gradient-induced bulk photovoltaic effect in MoS2 shows potential for advanced energy and sensing applications.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Optoelectronics

Background:

  • The Shockley-Queisser limit restricts conventional p-n junction solar cells.
  • The bulk photovoltaic effect, observed in non-centrosymmetric materials, offers a route to overcome this limit.
  • Flexo-photovoltaic effect, a strain-gradient-induced bulk photovoltaic effect, can be activated in centrosymmetric semiconductors.

Purpose of the Study:

  • To experimentally demonstrate the flexo-photovoltaic effect in a centrosymmetric material.
  • To explore strain-gradient engineering for activating the flexo-photovoltaic effect in two-dimensional (2D) materials.
  • To investigate the potential of MoS2 for enhanced photovoltaic applications.

Main Methods:

  • Utilized strain-gradient engineering via a hybrid MoS2/VO2 system.
  • Leveraged structural inhomogeneity and phase transition in the hybrid system to create strain gradients.
  • Measured the bulk photovoltaic coefficient in MoS2.

Main Results:

  • Successfully demonstrated the flexo-photovoltaic effect in MoS2.
  • Achieved a bulk photovoltaic coefficient in MoS2 that is orders of magnitude higher than in most non-centrosymmetric materials.
  • Established a fundamental link between the flexo-photovoltaic effect and strain gradients in low-dimensional materials.

Conclusions:

  • The flexo-photovoltaic effect can be effectively induced in centrosymmetric semiconductors like MoS2 through strain-gradient engineering.
  • MoS2 exhibits exceptional performance for the flexo-photovoltaic effect, surpassing many non-centrosymmetric materials.
  • This work opens avenues for novel optoelectronic devices and energy applications using strain-gradient-engineered low-dimensional materials.