Date

Place

Room E (Room 321)
12. Plasmonics and Metamaterials for Display II
August 19, 2015 (Wednesday)
14:00 ~ 15:30

[12-2]
14:25 ~ 14:50
Title:[Invited] Organic and Colloidal Quantum Dot Based Optoelectronic Devices: Photovoltaic Cell and Light Emitting Diode
Do Kyung Hwang, Tae-Hee Yoo, Hong Hee Kim, Choong Hyo Kim, and Won Kook Choi (KIST, Korea)
Abstract: Organic semiconductors and colloidal quantum dots (QDs) based optoelectronic devices such as photovoltaic cells and light emitting diode have attracted considerable attention as a promising technology for cost-effective renewable energy source, next generation displays, and solid-state lighting.In the first part of this talk, we will discuss Ag nanowire mesh film that has been used as a transparent electrode in fabrication of flexible P3HT:PC60BM and PTB7:PC70BM Organic solar cells (OSCs). Compared to the reference devices with ITO electrodes, the devices with Ag NW mesh electrodes showed the higher shor circuit current, resulting in the enhanced power conversion efficiency. These improvements were correlated with the enhanced light absorption in the active layer due to the light scattering and light trapping effect induced by the Ag NW mesh, which was confirmed by EQE spectra, a haze factor measurement and FDTD simulations. In the second part of this talk, we will report on a polyethylenimine ethoxylated (PEIE) modified ZnO nanoparticles (NPs) as electron injection and transport layer for inverted structure red CdSe-ZnS based quantum dot light emitting diode (QDLED). The PEIE surface modifier, incorporated on the top of the ZnO NPs film, facilitates the enhancement of both electron injection into the CdSe-ZnS QD emissive layer by lowering the workfunction of ZnO and charge balance on the QD emitter. As a result, this device exhibit a low turn-on voltage of 2.0-2.5 V and have maximum luminance and current efficiency values of 8600 cd/m2 and current efficiency of 1.53 cd/A, respectively. The same scheme with ZnO NPs/PEIE layer has also been used to successfully fabricate green, blue, and white QDLEDs.
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