Mr. Pin Tian Profile

Pin Tian

SPIE Involvement:

Author

Publications (2)

This will count as one of your downloads.

You will have access to both the presentation and article (if available).

DOWNLOAD NOW

This content is available for download via your institution's subscription. To access this item, please sign in to your personal account.

Email or Username Forgot your username?

Password Forgot your password?

Show

Keep me signed in

No SPIE account? Create an account

Proceedings Article | 18 March 2024 Paper

Study on the preparation of Ag2Se colloidal quantum dots and its infrared properties

Zhi Li, Libin Tang, Pin Tian, Wenbin Zuo, Kar Seng Teng

Proceedings Volume 13104, 131040T (2024) https://doi.org/10.1117/12.3021486

KEYWORDS: Silver, Selenium, Quantum dots, Thin films, Light absorption, Infrared detectors

Read Abstract +

Quantum dots infrared photodetector (QDIP) has found important applications due to its many advantages, such as long effective carrier life, low dark current, high operating temperature, facile preparation and low cost. In recent years, infrared photodetectors consisting of PbS and HgTe colloidal quantum dots (CQDs) have reported breakthroughs in the detection of short-wave infrared (SWIR) and mid-wave infrared (MWIR) demonstrating detectivity of 1×10¹³ Jones and 1×10¹¹ Jones, respectively. However, these materials contain Pb and Hg elements, which are harmful to human and the environment. Therefore, the development of non-toxic quantum dot materials is highly desirable for QDIP. In this work, Ag₂Se CQDs were studied for use in infrared photodetector. The novel CQDs have the advantages of low toxicity, good infrared optical properties, which can obtain adjustable infrared absorption due to its small bulk band gap of 0.15 eV, and biocompatibility etc. The Ag₂Se CQDs were prepared by hot injection method and were characterized by Transmission Electron Microscope (TEM), X-ray Diffraction (XRD), Fourier Transform Infrared spectrum (FTIR), Atomic Force Microscope (AFM) and X-ray Photoelectron Spectroscopy (XPS). These Ag₂Se CQDs demonstrated good monodispersion, size uniformity and crystallization. Interestingly, the exciton peak appeared in the infrared band of 3-4 μm. Subsequently, Ag₂Se CQDs photodetector was produced by spin coating the CQDs onto a 5 μm interdigital electrode. The device exhibited a low dark current of 1.3×10^-6 mA with responsivity of 5 A/W and detectivity of 1.5×10¹³ Jones. The results of this work show that Ag₂Se CQDs are expected to have potential applications in QDIP.

Proceedings Article | 31 January 2023 Paper

Solution-processed PbS colloidal quantum dots/PCBM based photodetector for multispectral detection

Lijing Yu, Pin Tian, Libin Tang, Qun Hao, Kar Seng Teng

Proceedings Volume 12505, 125050B (2023) https://doi.org/10.1117/12.2665265

KEYWORDS: Lead, Photodetectors, Quantum dots, Polymers, Electrodes, Ultraviolet radiation, Crystals, Photovoltaics, Lithium, Aluminum

Read Abstract +

Photodetectors convert optical signals into electrical signals and have found many important applications ranging from environmental monitoring to communication systems. At present, most photodetectors are based on either bulk materials or epitaxially grown materials (such as InSb and HgCdTe), which limit its widespread applications due to relatively high fabrication cost. However, photodetector based on organic polymer/colloidal quantum dots (CQDs) can provide a low-cost alternative. In this paper, a broadband photodetector consisting of organic polymer phenyl-c61-butyric acid methyl ester (PCBM) and PbS CQDs was fabricated. Combining the advantages of PbS CQDs and organic polymer PCBM, the device demonstrated good spectral response ranging from the UV to the NIR with a maximum responsivity and detectivity of 0.3 A/W and 6.6 × 1011 Jones, respectively, under illumination of 850 nm incident light. The device can be fabricated on almost any substrate due to the solution-processibility of CQDs. Furthermore, the use of organic polymer substrate can significantly reduce the cost of device and broaden its applications (such as in flexible electronics). This work provides a simple and efficient strategy to fabricate photodetector that exhibits multi-band response at relatively low-cost.

My Library

You currently do not have any folders to save your paper to! Create a new folder below.

Folder Name

Folder Description

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks. You are receiving this notice because your organization may not have SPIE eBooks access.*

*Shibboleth/Open Athens users─please sign in to access your institution's subscriptions.

To obtain this item, you may purchase the complete book in print or electronic format on SPIE.org.

ORGANIZATIONAL
Sign in with credentials provided by your organization.

Organizational Username

Organizational Password

Show/Hide Password

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members:

Non-members: ADD TO CART

Keywords/Phrases

Search In:

Publication Years