Volume 32, Issue 12 p. 3086-3097
Full Paper

Electro-photovoltaics of Polymer-stabilized Copper–Indium Selenide Quantum Dot

Muziwenkosi Memela

Muziwenkosi Memela

SensorLab, University of the Western Cape Sensor Laboratories, Robert Sobukwe Road, Bellville 7535 Cape Town, South Africa.

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Dr. Usisipho Feleni

Corresponding Author

Dr. Usisipho Feleni

Institute for Nanotechnology and Water Sustainability (iNanoWS), College of Science, Engineering and Technology, University of South Africa, P/Bag X6 Florida Campus 1710, Roodepoort, Johannesburg, South Africa

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Siyabonga Mdluli

Siyabonga Mdluli

SensorLab, University of the Western Cape Sensor Laboratories, Robert Sobukwe Road, Bellville 7535 Cape Town, South Africa.

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Morongwa E. Ramoroka

Morongwa E. Ramoroka

SensorLab, University of the Western Cape Sensor Laboratories, Robert Sobukwe Road, Bellville 7535 Cape Town, South Africa.

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Precious Ekwere

Precious Ekwere

SensorLab, University of the Western Cape Sensor Laboratories, Robert Sobukwe Road, Bellville 7535 Cape Town, South Africa.

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Dr. Samantha Douman

Dr. Samantha Douman

SensorLab, University of the Western Cape Sensor Laboratories, Robert Sobukwe Road, Bellville 7535 Cape Town, South Africa.

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Prof. Emmanuel Iwuoha

Prof. Emmanuel Iwuoha

SensorLab, University of the Western Cape Sensor Laboratories, Robert Sobukwe Road, Bellville 7535 Cape Town, South Africa.

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First published: 18 October 2020
Citations: 3

Abstract

Semiconducting quantum dot (QD) materials formed by the combination of groups I, III and VI elements are perceived as promising green materials with excellent photovoltaic properties, owing to their near-infrared (NIR) remarkable range and less harmful elements. In this study electroactive ∼7 nm copper indium selenide quantum dot (CuInSe2 QD) capped with generation 1 poly (propylene thiophene) dendrimer (G1PPT), was synthesised via the hot injection method. Fourier transform infrared spectroscopy (FT-IR) signatures of the dendrimer confirmed the effective functionalization of CuInSe2 with G1PPT. Characteristic ultraviolet-visible (UV-Vis) absorption band at 784 nm and a Tauc plot band gap energy (Egd) value of 1.51 eV which indicates a very significant photovoltaic behaviour of the CuInSe2-G1PPT QD. The cyclic voltammetrically-deduced HOMO (-5.140 eV) and LUMO (−3.537 eV) energy levels gave an electrochemical bandgap (urn:x-wiley:10400397:media:elan202060392:elan202060392-math-0001 ) value of 1.60 eV. The electron-hole Coulomb interaction energy (urn:x-wiley:10400397:media:elan202060392:elan202060392-math-0002 ) was determined to be 90 MeV, which confirms that the light absorbed by CuInSe2-G1PPT QD mainly produce photon absorption excitons, making the material highly suitable for photovoltaic application.

Data Availability Statement

Data are available on request due to privacy/ethical restrictions. The data that support the findings of this study are available from the corresponding author. The data are not publicly available due to privacy or ethical restrictions.