DataVXACS Applied Energy MaterialsPaper
journal article·2022-02-28

Role of Interfacial Engineering of “Giant” Core–Shell Quantum Dots

Gurpreet Singh Selopal, Omar Abdelkarim, Pawan Kumar, Lei Jin, Jiabin Liu, Haiguang Zhao, Aycan Yurtsever, Francois Vidal, Zhiming M. Wang, Federico Rosei

ACS Applied Energy Materials· Volume 5· Issue 2
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Source abstract

Abstract

Structural engineering of the shell layer in “giant” core–shell quantum dots (QDs) offers precise control over the spatial carrier separation and other optoelectronic properties by forming a quasi-type-II band alignment. We report the synthesis of highly stable “giant” CdSe–CdS QDs with different CdS shell thicknesses (2.2–4.8 nm) and alloyed PbxCd1–xS interfacial layers at the CdSe–CdS interface. The “giant” core–shell QDs with alloyed interfacial layers show a broader absorption spectrum, faster carrier transfer rate, and higher hole leakage into the shell region, compared to CdSe–CdS QDs with similar size, as confirmed by optical, transient photoluminescence decay measurements and theoretical simulations. As a proof of concept, the as-synthesized “giant” core-alloyed shell QD (denoted as CdSe@CPS-13)-sensitized solar cells (QDSCs) yield a power conversion efficiency (PCE) of 4.15%, which is 77% higher than the PCE of QDSCs based on “giant” CdSe–CdS QDs with comparable size and shell thickness. These results show that interfacial engineering is an effective methodology to tailor the optical and electronic properties of core–shell QDs with great potential to enhance the performance of photovoltaic and other solar-energy-driven devices.
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Research context

Metals & alloysElectronic materials

OpenAlex topics: Quantum Dots Synthesis And Properties · ZnO doping and properties · Chalcogenide Semiconductor Thin Films

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Institute of Fundamental and Frontier Science, University of Electronic Science and Technology of China, Chengdu 610054, Sichuan, P. R. China

Centre for Energy, Materials and Telecommunications, Institut National de la Recherche Scientifique, 1650 Boulevard Lionel-Boulet, Varennes, Quebec J3X 1P7, Canada

State Key Laboratory of Bio-Fibers and Eco-Textiles & College of Physics, Qingdao University, No. 308 Ningxia Road, Qingdao 266071, P. R. China

Institute for Advanced Study, Chengdu University, Chengdu 610106, Sichuan, P. R. China

Funding

State Administration of Foreign Experts Affairs · Ministry of Education of the People's Republic of China · Ministry of Science and Technology of the People's Republic of China · Canada Foundation for Innovation · China Postdoctoral Science Foundation · University of Electronic Science and Technology of China · Canada Research Chairs · United Nations Educational, Scientific and Cultural Organization · China Scholarship Council · Natural Sciences and Engineering Research Council of Canada

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