Achievement introduction

Due to the unique advantages of the "black background" on the earth, day blind photodetectors have been widely used. However, most of the previously reported solar blind photodetectors have a relatively low rejection ratio (R_{200 nm}/R_{280 nm}<10³) and are disturbed by light above 280 nm.

In view of this, recently, Professor Hu Ping‘an, Chen Hongyu and Yang Huihui (co-corresponding authors) of Harbin Institute of Technology have synthesized large areas of different thicknesses on Au foil by using environmental pressure chemical vapor deposition (CVD) method, which are clean and uniform The two-dimensional (2D) multilayer h-BN film is transparent to the spectrum over 280 nm and exhibits excellent optical and optoelectronic performance for weak day blind light. This sensitive day-blind h-BN photodetector has an ultra-high rejection ratio (R_{220 nm}/R_{280 nm}>10³ and R_{220 nm}/R_{290 nm}>10⁴), low dark current (10² fA) and large detection rate (3.9× 10¹⁰ Jones). It is worth noting that the rejection ratio (R_{220 nm}/R_{290 nm}) here is better than most of the previous based on traditional semiconductors. This large-area, clean and uniform multilayer h-BN thin film will contribute to the development of next-generation optoelectronic devices.


Graphic guide

Figure 1. CVD synthesis of centimeter-level multilayer h-BN thin films grown on gold foil for 10 minutes.

Figure 2. AFM images of h-BN films with different thicknesses and the thickness-dependent light absorption.

Figure 3. Thickness-dependent optical response of a day-blind h-BN photodetector.

Figure 4. Photoelectric characteristics of the day blind h-BN photodetector.

Figure 5. Flexible optical response to different bias voltages and light intensities.

Literature information


Synthesis of High-Quality Multilayer Hexagonal Boron Nitride Films on Au Foils for Ultrahigh Rejection Ratio Solar-Blind Photodetection

(ACS Appl. Mater. Interfaces, 2020, DOI:10.1021/acsami.0c00449)


Literature link: https://pubs.acs.org/doi/10.1021/acsami.0c00449


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