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UV–Vis Spectrometers

UV–Vis Spectrometers

The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell.

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Related Experiment Video

Updated: Nov 14, 2025

Synthesis and Characterization of High c-axis ZnO Thin Film by Plasma Enhanced Chemical Vapor Deposition System and its UV Photodetector Application

Synthesis and Characterization of High c-axis ZnO Thin Film by Plasma Enhanced Chemical Vapor Deposition System and its UV Photodetector Application

Published on: October 3, 2015

High-Performance and Self-Powered Alternating Current Ultraviolet Photodetector for Digital Communication.

Mohit Kumar^1,2, Ji-Yong Park^1,3, Hyungtak Seo^1,2

¹Department of Energy Systems Research, Ajou University, Suwon 16499, Republic of Korea.

ACS Applied Materials & Interfaces

|March 8, 2021

Summary

This study presents a novel titanium dioxide ultraviolet photodetector that achieves high sensitivity and fast response speeds. The self-powered device demonstrates significant performance enhancements using an alternating current photovoltaic effect for advanced optoelectronics.

Keywords:

digital communication high-performing photoconductive atomic force microscopy self-powered ultraviolet photodetectors

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Area of Science:

Optoelectronics
Materials Science
Nanotechnology

Background:

Self-powered ultraviolet photodetectors are crucial for optical communication, security, and space exploration.
A key challenge is enhancing sensitivity while maintaining fast response speeds.

Purpose of the Study:

To develop a high-performance, self-powered ultraviolet photodetector using titanium dioxide.
To investigate the impact of the alternating current photovoltaic effect on device performance.

Main Methods:

Fabrication of a titanium dioxide-based ultraviolet photodetector.
Characterization of device performance under pulsed illumination, including detectivity, photoresponsivity, and on/off ratio.
Utilizing photoconductive atomic force microscopy for nanoscale charge transport analysis.

Main Results:

Achieved high detectivity (≈1.8 × 10^10 Jones) and photoresponsivity (0.32 mA W^-1) with significant enhancements due to the AC photovoltaic effect.
Demonstrated ultrafast rise/decay times (112/63 μs) and a high on/off ratio (≈10^3) under self-biased conditions.
Confirmed nanoscale charge transport and potential for sub-10-nanometer device scaling.

Conclusions:

The developed titanium dioxide photodetector offers a promising solution for energy-efficient, ultrafast optoelectronic applications.
The alternating current photovoltaic effect provides a new pathway for designing advanced photodetectors.
The device's successful application in interpreting digital codes highlights its practical utility.