Highly Responsive Al/PTB7/Si/Al Vertical Structure-Based White Light Photodetector Using FTM Method

Abstract

This letter reports a p-type Poly [[4,8-bis[(2- ethylhexyl)oxy]benzo[1,2-b:4,5-b’]dithiophene-2,6-diyl][3-fluoro- 2-[(2-ethylhexyl) carbonyl] thieno [3,4-b] thiophenediyl ]] (PTB7) thin film based Al/PTB7/Si/Al vertical structure for white light detection application. The thin film of PTB7 polymer was deposited via a low-cost and facile floating-film transfer method (FTM). The morphology of the PTB7 film is analyzed by tapping mode Atomic Force Microscopy (AFM) which gives an average surface roughness as ~0.703 nm. The maximum responsivity and detectivity of the fabricated device were obtained as ~146.13 mA/W and ~4.137 × 1010 Jones at ~0.228 mW/cm2 white light intensity under a reverse bias of -2 V. The rise/fall time of the fabricated sensing device was measured as ~0.016/~0.112 s respectively. © 2023 IEEE.