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High Hall Mobility P‐type Cu 2 SnS 3 ‐Ga 2 O 3 with a High Work Function
Author(s) -
Kim Jeonggi,
Kim HyoMin,
Cho Sinyoung,
Avis Christophe,
Jang Jin
Publication year - 2018
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201802941
Subject(s) - materials science , work function , quantum efficiency , raman spectroscopy , x ray photoelectron spectroscopy , crystallite , electrical resistivity and conductivity , electron mobility , optoelectronics , diode , oxide , analytical chemistry (journal) , layer (electronics) , optics , nuclear magnetic resonance , nanotechnology , metallurgy , physics , chemistry , chromatography , quantum mechanics
A new transparent p‐type oxide semiconductor (POS) is reported, Cu 2 SnS 3 ‐Ga 2 O 3 , having high Hall mobility of 36.22 cm 2 V −1 s −1 , and high work function of 5.17 eV. The existence of Cu 2 SnS 3 and Ga 2 O 3 phases in the film is confirmed by X‐ray photoelectron spectroscopy results and the Cu 2 SnS 3 shows polycrystalline structure according to Raman spectrum and X‐ray diffraction analysis. The transparent Cu 2 SnS 3 ‐Ga 2 O 3 exhibits the carrier concentration of 5.86 × 10 16 cm −3 , and electrical resistivity of 1.94 Ω·cm. The transparent POS is applied to green quantum light‐emitting diodes (QLEDs) as a hole injection layer (HIL) because of its high work function. The QLED exhibits the maximum current efficiency of 51.72 cd A −1 , power efficiency of 31.97 lm W −1 , and external quantum efficiency (EQE) of 14.93%, which are much higher than the QLED using polyethylene dioxythophene:poly(styrenesulfonate) HIL exhibiting current efficiency of 42.66 cd A −1 , power efficiency of 20.33 lm W −1 , and EQE of 12.36%. The Cu 2 SnS 3 ‐Ga 2 O 3 developed in this work can be widely used as a transparent and conductive p‐type oxide for thin‐film devices.