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Growth kinetics and mechanisms of multinary copper-based metal sulfide nanocrystals

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Abstract

Multinary copper-based metal sulfide (Cu-M-S) nanocrystals (NCs) usually have high absorption coefficients and near-optimum direct band gaps, which have been considered as novel photo-absorption materials for quantum dot-sensitized solar cells (QDSCs) and hole-transport materials for perovskite solar cells (PSCs). However, the formation and phase transformation mechanisms of Cu-M-S NCs during the solution-based preparing approaches are complicated. Herein, Cu-M-S NCs, including Cu2ZnSnS4 (CZTS), Cu2SnS3 (CTS), CuInS2 (CIS), and CuSbS2 (CAS), have been synthesized through solution-based hot-injection methods. Their formation and phase transformation mechanisms have been studied in terms of the growth kinetics. An effective method has been proposed to investigate the formation mechanisms of Cu-M-S NCs. The results suggest that CZTS, CTS, and CIS NCs are formed through an inter-reaction between metal sulfides rather than the classical cation exchange reactions, and CAS NCs are formed based on the CuxS structure; these findings provide new insights into the formation of Cu-M-S NCs. In addition, the anisotropic or isotropic growth processes during the growth stage have been found to be the key issues in the formation of a zinc blende or wurtzite structure NCs, respectively, which can be controlled by tuning the relative reactivity of metal precursors.

Graphical abstract: Growth kinetics and mechanisms of multinary copper-based metal sulfide nanocrystals

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Publication details

The article was received on 19 May 2017, accepted on 30 Jul 2017 and first published on 01 Aug 2017


Article type: Paper
DOI: 10.1039/C7NR03576D
Citation: Nanoscale, 2017, Advance Article
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    Growth kinetics and mechanisms of multinary copper-based metal sulfide nanocrystals

    K. Chen, J. Zhou, W. Chen, Q. Zhong, T. Yang, X. Yang, C. Deng and Y. Liu, Nanoscale, 2017, Advance Article , DOI: 10.1039/C7NR03576D

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