Controlled synthesis of Eu 2+ and Eu 3+ doped ZnS quantum dots and their photovoltaic and magnetic properties

Horoz, Sabit; Yakami, Baichhabi; Poudyal, Uma; Pikal, Jon M.; Wang, Wenyong; Tang, Jinke

doi:10.1063/1.4948510

Title: Controlled synthesis of Eu ²⁺ and Eu ³⁺ doped ZnS quantum dots and their photovoltaic and magnetic properties

Journal Article · Fri Apr 01 00:00:00 EDT 2016 · AIP Advances

DOI:https://doi.org/10.1063/1.4948510· OSTI ID:1249619

Horoz, Sabit; Yakami, Baichhabi; Poudyal, Uma;

; Wang, Wenyong; Tang, Jinke

Eu-doped ZnS quantum dots (QDs) have been synthesized by wet-chemical method and found to form in zinc blende (cubic) structure. Both Eu²⁺ and Eu³⁺ doped ZnS can be controllably synthesized. The Eu²⁺ doped ZnS QDs show broad photoluminescence emission peak around 512 nm, which is from the Eu2+ intra-ion transition of 4f⁶d1 – 4f⁷, while the Eu³⁺ doped samples exhibit narrow emission lines characteristic of transitions between the 4f levels. The investigation of the magnetic properties shows that the Eu³⁺ doped samples exhibit signs of ferromagnetism, on the other hand, Eu²⁺ doped samples are paramagnetic of Curie-Weiss type. The incident photon to electron conversion efficiency is increased with the Eu doping, which suggests the QD solar cell efficiency can be enhanced by Eu doping due to widened absorption windows. This is an attractive approach to utilize benign and environmentally friendly wide band gap ZnS QDs in solar cell technology.

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Research Organization:: Univ. of Wyoming, Laramie, WY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR); USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: FG02-10ER46728; SC0004981

OSTI ID:: 1249619

Alternate ID(s):: OSTI ID: 1393432; OSTI ID: 1421036

Journal Information:: AIP Advances, Journal Name: AIP Advances Vol. 6 Journal Issue: 4; ISSN 2158-3226

Publisher:: American Institute of PhysicsCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 28 works

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Absorption enhancement by transition metal doping in ZnS Gurung, Gautam; Ekanayaka, Thilini K.; Yost, Andrew J. Materials Research Express, Vol. 6, Issue 12 https://doi.org/10.1088/2053-1591/ab56d6	journal	November 2019

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