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A Colloidal-Quantum-Dot Infrared Photodiode with High Photoconductive Gain.

A new interesting article has been published in Small. 2018 Oct 21:e1803158. doi: 10.1002/smll.201803158. [Epub ahead of print] and titled:

A Colloidal-Quantum-Dot Infrared Photodiode with High Photoconductive Gain.

Authors of this article are:

Tang Y, Wu F, Chen F, Zhou Y, Wang P, Long M, Zhou W, Ning Z, He J, Gong F, Zhu Z, Qin S, Hu W.

A summary of the article is shown below:

The photodiode is a prevailing architecture for photodetection with the merits of fast response and low dark current. However, an ideal photodiode is also desired for both high responsivity and high external quantum efficiency (EQE), which may facilitate more applications. Here the photoconducting effect in a photodiode is discussed and an Au-PbS colloidal quantum dot (CQD)-indium tin oxide Schottky junction photodiode is fabricated. The long carrier lifetime and improved carrier mobility in tetrabutylammonium iodide-modified PbS CQDs cooperating with the proper band structure and an ultrashort channel in the diode enable the photodiode with high photoconductive gain, realizing an EQE of ≈400% and a responsivity (R) of 5.15 A W-1 while simultaneously achieving a response time of 110 µs and a specific detectivity of 1.96 × 1010 Jones under 1550 nm illumination. In addition, this CQD-based photodiode is stable, low cost, and compatible with complementary metal oxide semiconductor technology. All of these promise this device great potential in applications.

Check out the article’s website on Pubmed for more information:

This article is a good source of information and a good way to become familiar with topics such as:

colloidal quantum dots;infrared photodiodes;photoconductive gain


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