Realizing the Potential of ZnO with alternative non-metallic co-dopants as electrode for small molecule optoelectronic devices

Title
Realizing the Potential of ZnO with alternative non-metallic co-dopants as electrode for small molecule optoelectronic devices
Authors
김용현김진수김원목성태연Jonghee LeeLars Muller-MeskampKarl Leo
Keywords
Transparent conducting oxide; ZnO; OLED; OPV; non-metallic co-dopants
Issue Date
2013-08
Publisher
Advanced functional materials
Citation
VOL 23, NO 29, 3645-3652
Abstract
High performance indium tin oxide (ITO)-free small molecule organic solar cells and organic light-emitting diodes (OLEDs) are demonstrated using optimized ZnO electrodes with alternative non-metallic co-dopants. The co-doping of hydrogen and fl uorine reduces the metal content of ZnO thin fi lms, resulting in a low absorption coeffi cient, a high transmittance, and a low refractive index as well as the high conductivity, which are needed for the application in organic solar cells and OLEDs. While the established metal-doped ZnO fi lms have good electrical and optical properties, their application in organic devices is not as effi cient as other alternative electrode approaches. The optimized ZnO electrodes presented here are employed in organic solar cells as well as OLEDs and allow not only the replacement of ITO, but also signifi cantly improve the effi ciency compared to lab-standard ITO. The enhanced performance is attributed to outstanding optical properties and spontaneously nanostructured surfaces of the ZnO fi lms with non-metallic co-dopants and their straightforward integration with molecular doping technology, which avoids several common drawbacks of ZnO electrodes. The observations show that optimized ZnO fi lms with non-metallic co-dopants are a promising and competitive electrode for low-cost and high performance organic solar cells and OLEDs.
URI
http://pubs.kist.re.kr/handle/201004/45222
ISSN
1616301X
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KIST Publication > Article
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