Abstract
We report on the formation of transferable microspheres monolayers consisting of ZnSnO3 (ZTO) synthesized via fast ethanol precipitation and their application to GaN-based light-emitting diodes (LEDs) to improve device performance. ZTO microspheres with diameters of 820 ± 20 nm (ZTO-1), 910 ± 10 nm (ZTO-2), and 1200 ± 10 nm (ZTO-3) were synthesized and arrayed to form a monolayer using polydimethylsiloxane (PDMS) and a unidirectional rubbing method. ZTO-1, ZTO-2, and ZTO-3 monolayers exhibited optical transmittance percentages of 94.4%, 92.98%, and 87.09% at 450 nm, respectively. Effects of ZTO monolayers on the light extraction efficiency of LEDs were evaluated using LED chips sized 800 μm × 800 μm. LEDs with a ZTO-3 monolayer as a top layer had a light extraction efficiency of ∼144%, relative to regular LEDs, as well as improved electrical properties, as evidenced by a decrease in Vturn on of ∼0.6 V and a decrease in Ron by 0.036 kΩ. XPS analysis indicated that the improvement in the electrical properti...
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