Rational synthesis of novel “giant” CuInTeSe/CdS core/shell quantum dots for optoelectronics

Jing-Yin Xu; Xin Tong; Lucas V. Besteiro; Xin Li; Chenxia Hu; Ruitong Liu; Ali Imran Channa; Haiguang Zhao; Federico Rosei; Alexander O. Govorov; Qiang Wang; Zhiming M. Wang

doi:10.1039/D1NR04199A

Rational synthesis of novel “giant” CuInTeSe/CdS core/shell quantum dots for optoelectronics†

Jing-Yin Xu,^a Xin Tong,

*^ab Lucas V. Besteiro,^ac Xin Li,^a Chenxia Hu,^d Ruitong Liu,^d Ali Imran Channa,

^a Haiguang Zhao,

^e Federico Rosei,

^ac Alexander O. Govorov,

^f Qiang Wang

*^d and Zhiming M. Wang*^abg

Author affiliations

* Corresponding authors

^a Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 610054, P. R. China
E-mail: xin.tong@uestc.edu.cn, zhmwang@uestc.edu.cn

^b Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China, Huzhou 313001, P. R. China

^c Institut National de la Recherche Scientifique, Centre Énergie, Matériaux et Télécommunications, 1650 Boul. Lionel Boulet, J3X 1S2 Varennes, Québec, Canada

^d State Key Laboratory of Applied Organic Chemistry, Key Laboratory of Special Function Materials and Structure Design, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, P. R. China
E-mail: qiangwang@lzu.edu.cn

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

^f Department of Physics and Astronomy, Ohio University, Athens, OH 45701, USA

^g Institute of Microengineering and Nanoelectronics (IMEN), Universiti Kebangsaan Malaysia, Bangi, Selangor, Malaysia

Abstract

“Giant” core/shell quantum dots (g-QDs) are promising candidates for emerging optoelectronic technologies thanks to their facile structure/composition-tunable optoelectronic properties and outstanding photo-physical/chemical stability. Here, we synthesized a new type of CuInTeSe (CITS)/CdS g-QDs and regulated their optoelectronic properties by controlling the shell thickness. Through increasing the shell thickness, as-prepared g-QDs exhibited tunable red-shifted emission (from 900 to 1200 nm) and prolonged photoluminescence (PL) lifetimes (up to ∼14.0 μs), indicating a formed band structure showing efficient charge separation and transfer, which is further testified by theoretical calculations and ultrafast time-resolved transient absorption (TA) spectroscopy. These CITS/CdS g-QDs with various shell thicknesses can be employed to fabricate photoelectrochemical (PEC) cells, exhibiting improved photoresponse and stability as compared to the bare CITS QD-based devices. The results indicate that the rational design and engineering of g-QDs is very promising for future QD-based optoelectronic technologies.

Nanoscale

Rational synthesis of novel “giant” CuInTeSe/CdS core/shell quantum dots for optoelectronics†

Abstract

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Rational synthesis of novel “giant” CuInTeSe/CdS core/shell quantum dots for optoelectronics

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