Issue 42, 2020

Flexible crystalline β-Ga2O3 solar-blind photodetectors

Abstract

This paper reports the fabrication of β-Ga2O3 nanomembrane (NM) based flexible photodetectors (PDs) and the investigation of their optoelectrical properties under bending conditions. Flexible β-Ga2O3 NM PDs exhibited reliable solar-blind photo-detection under bending conditions. Interestingly, a slight shifting in wavelength of the maximum solar-blind photo-current was observed under the bending condition. To investigate the reason for this peak shifting, the optical properties of β-Ga2O3 NMs under different strain conditions were measured, which revealed changes in the refractive index, extinction coefficient and bandgap of strained β-Ga2O3 NMs due to the presence of nano-sized cracks in the β-Ga2O3 NMs. The results of a multiphysics simulation and a density-functional theory calculation for strained β-Ga2O3 NMs showed that the conduction band minimum and the valence band maximum states were shifted nearly linearly with the applied uniaxial strain, which caused changes in the optical properties of the β-Ga2O3 NM. We also found that nano-gaps in the β-Ga2O3 NM play a crucial role in enhancing the photoresponsivity of the β-Ga2O3 NM PD under bending conditions due to the secondary light absorption caused by reflected light from the nano-gap surfaces. Therefore, this research provides a viable route to realize high-performance flexible photodetectors, which are one of the indispensable components in future flexible sensor systems.

Graphical abstract: Flexible crystalline β-Ga2O3 solar-blind photodetectors

Supplementary files

Article information

Article type
Paper
Submitted
06 elo 2020
Accepted
03 syys 2020
First published
03 syys 2020

J. Mater. Chem. C, 2020,8, 14732-14739

Author version available

Flexible crystalline β-Ga2O3 solar-blind photodetectors

J. Lai, M. N. Hasan, E. Swinnich, Z. Tang, S. Shin, M. Kim, P. Zhang and J. Seo, J. Mater. Chem. C, 2020, 8, 14732 DOI: 10.1039/D0TC03740K

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