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High‐Performance Quantum‐Dot Solids via Elemental Sulfur Synthesis
Author(s) -
Yuan Mingjian,
Kemp Kyle W.,
Thon Susanna M.,
Kim Jin Young,
Chou Kang Wei,
Amassian Aram,
Sargent Edward H.
Publication year - 2014
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201305912
Subject(s) - passivation , materials science , energy conversion efficiency , photovoltaic system , band gap , sulfur , quantum dot , dispersion (optics) , solar cell , optoelectronics , precipitation , nanotechnology , optics , metallurgy , ecology , physics , layer (electronics) , biology , meteorology
An elemental‐sulfur‐based synthesis is reported, which, combined with processing to improve the size dispersion and passivation, results in a low‐cost high‐quality platform for small‐bandgap PbS‐CQD‐based devices. Size‐selective precipitation and cadmium chloride passivation are used to improve the power conversion efficiency of 1 eV bandgap CQD photovoltaic devices dramatically, which leads to record power conversion efficiency for a 1 eV PbS CQD solar cell of 5.4%.