Issue 17, 2024

Enlarging the Stokes shift of CuInS2 quantum dots using thiol–ene polymers for efficient large-area luminescent solar concentrators

Abstract

CuInS2/ZnS (CIS/ZnS) quantum dots (QDs) are extensively employed as fluorophores in luminescent solar concentrators (LSCs), due to their excellent optical properties and low toxicity. However, the power conversion efficiency (PCE) of LSCs employing CIS/ZnS QDs is significantly constrained by the energy losses from the overlap between the absorption and emission spectra. Herein, we propose a novel and facile approach to enlarge the Stokes shift of CIS/ZnS QDs using the off-stoichiometric thiol–ene (OSTE) polymers. Significantly, the photoluminescence (PL) spectrum of CIS/ZnS QDs in OSTE experienced a substantial redshift of 65 nm without compromising the PLQY. This resulted in a remarkably enlarged Stokes shift of 585 meV and a minimal spectral overlap integral of 0.126, marking the first instance of a nanocomposite featuring CIS/ZnS QDs with such an enlarged Stokes shift. Further investigation demonstrates that thiol monomers, characterized by a strong electron-donating property, altered the Cu+ defect energy states in CIS QDs, resulting in a significant redshift in the PL spectrum. Consequently, a certified record PCE of 1.36% was achieved for a large-area (29 × 29 cm2) LSC device with an average visible transmittance (AVT) of 51%, representing the highest PCE value for such devices. Our findings not only present a viable strategy for augmenting the efficiency of CIS/ZnS QD-based LSCs for building-integrated photovoltaics (BIPV) but also establish a new avenue for controlling the optical properties of QD/polymer nanocomposites for other optoelectronic devices.

Graphical abstract: Enlarging the Stokes shift of CuInS2 quantum dots using thiol–ene polymers for efficient large-area luminescent solar concentrators

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Article information

Article type
Paper
Submitted
14 Jun 2024
Accepted
24 Jul 2024
First published
25 Jul 2024

Energy Environ. Sci., 2024,17, 6338-6349

Enlarging the Stokes shift of CuInS2 quantum dots using thiol–ene polymers for efficient large-area luminescent solar concentrators

Y. Wu, J. Huang, J. Zang, J. Zhou, C. Cheng, Z. Hu, D. Shan, W. Yang, I. Sychugov, L. Sun and B. Xu, Energy Environ. Sci., 2024, 17, 6338 DOI: 10.1039/D4EE02603A

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