Application of quantum dot sensitization on two-dimensional semiconductors for improved light harvesting (Conference Presentation)

Chang-Yong Nam

doi:10.1117/12.2304741

14 May 2018 Application of quantum dot sensitization on two-dimensional semiconductors for improved light harvesting (Conference Presentation)

Chang-Yong Nam

Author Affiliations +

Proceedings Volume 10639, Micro- and Nanotechnology Sensors, Systems, and Applications X; 106390W (2018) https://doi.org/10.1117/12.2304741
Event: SPIE Defense + Security, 2018, Orlando, FL, United States

Abstract

Atomically thin two-dimensional (2D) semiconductors boast numerous intriguing enhanced material properties for various potential electronic device applications. For optoelectronic devices, such as photodetectors and photovoltaics, an efficient light harvesting is highly demanded, and the relatively low absolute optical absorption of 2D semiconductors can, therefore, limit associated device performances, including photodetector responsivity and solar cell power conversion efficiency. Recently, the sensitization by quantum dots (QDs) has shown promises for improving the optical absorption in 2D semiconductors. In this talk, I will highlight our recent efforts towards utilizing QD sensitization for improving the photo-response of 2D semiconductor field-effect transistor (FET) photodetectors. The first example demonstrates a 500% enhancement in photocurrent response by the application of energy transfer from CdSe/ZnS core/shell QDs in 2D SnS2, a model 2D system with indirect band gap nature. Also detailed is the case of 2D MoS2, where we show that the light-intensity-dependent photo-response characterized by scanning photocurrent microscopy (SPCM) can distinguish two fundamental modes of interfacial interaction between QDs and 2D materials, namely energy and charge transfers, which are extremely difficult to distinguish under typically optical interrogation methods. I will try to discuss the potential implication of these two modes towards the optoelectronic application of QD-2D hybrid materials.

Conference Presentation

Citation Download Citation

Chang-Yong Nam "Application of quantum dot sensitization on two-dimensional semiconductors for improved light harvesting (Conference Presentation)", Proc. SPIE 10639, Micro- and Nanotechnology Sensors, Systems, and Applications X, 106390W (14 May 2018); https://doi.org/10.1117/12.2304741

ACCESS THE FULL ARTICLE

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