Advanced Optical Detection through the Use of a Deformably Transferred Nanofilm

Kossi Aniya Amedome Min-Dianey,Top Khac Le,Jeong Ryeol Choi,Phuong V Pham

doi:10.3390/nano11030816

Kossi Aniya Amedome Min-Dianey, Top Khac Le + Show 2 more

Open Access

https://doi.org/10.3390/nano11030816

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Abstract

Graphene has been extensively investigated in advanced photodetection devices for its broadband absorption, high carrier mobility, and mechanical flexibility. Due to graphene’s low optical absorptivity (2.3%), graphene-based photodetection research so far has focused on hybrid systems to increase photoabsorption. However, such hybrid systems require a complicated integration process and lead to reduced carrier mobility due to heterogeneous interfaces. Crumpled or deformed graphene has previously been reported in electronics and optoelectronics. However, a depth study on the influence of the morphology of nanofilms (e.g., graphite or graphene) related to light absorption in photodetection devices has not been demonstrated yet. Here, we present an interesting study in terms of the effect of the deformable surface and the smooth surface of a nanofilm transferred onto Si through two transfer strategies using isopropanol injection and nitrogen blowing (to form a deformable nanofilm surface) and deionized water injection and van der Waals interaction (to form a smooth nanofilm surface). As a result, optical detection in the case of the deformable nanofilm surface was enhanced significantly (~100%) compared with that of the smooth nanofilm surface in the visible laser wavelength (532 nm). In addition, evidence from the computational simulation also firmly affirms an advancement in the optical detection of deformed nanofilm-surface-based photodetection devices compatible with the experimental results.

Highlights

We report the influence of the morphologies of 2D nanofilm materials on optical detection in terms of the visible wavelength under two shapes of transferrednanofilm materials: (i) a deformable nanofilm surface formed by isopropanol (IPA) injection and N2 blowing, where N2 blowing makes the deformable nanofilm surface, and (ii) a smooth nanofilm surface formed by deionized (DI) water injection and van der Waals interaction
A nanofilm was created by stacked multiple previous report by Sone et al [33]
A nanofilm was created by stacked multiple layers, layers, the thickness the nanofilm

Summary

Introduction

Graphene or monoatomic-layer graphite is a zero-bandgap honeycomb flat film formed by the sp2 hybridization of carbon atoms with different behaviors, e.g., high mobility, high transmittance, and novel thermal and electrical conductance [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30]. To highlight the effect of the deformable nanofilm surface on light detection, the photodetection devices were fabricated on the SiO2 substrate, and the deformable and smooth nanofilms were transferred onto the etched Si window of the devices.

Results

Conclusion