DocumentCode :
3443
Title :
Conventional and Inverted UV-PDs Based on Solution Processed PFE:ZnO Active Layer
Author :
Memisoglu, Gorkem ; Varlikli, Canan
Author_Institution :
Solar Energy Inst., Ege Univ., Izmir, Turkey
Volume :
27
Issue :
5
fYear :
2015
fDate :
March1, 1 2015
Firstpage :
537
Lastpage :
540
Abstract :
Solution processed ultraviolet photodetectors with conventional and inverted architectures with active layers composed of poly(9,9-dioctylfluorenyl-2,7-yleneethynylene) (PFE) and zincoxide (ZnO) nanoparticle hybrid are introduced. Under 1 mW/cm2 illumination intensity at 365 nm wavelength and for -4 V bias and room temperature, the conventional device structure of ITO/PEDOT:PSS/PFE:ZnO/Al and the inverted device structure of ITO/PFE:ZnO/Au are yielded photoresponsivity values of 311 and 244 mA/W, detectivity values of 1.4 × 1014 and 5.1 × 1013 cmHz1/2W-1, and external quantum efficiency values of 105.6% and 82.7%, respectively. By annealing the active layer at polymer´s glass transition temperature (Tg; 60 °C) for 15 min, these values are increased to 375 and 280 mA/W, 1.6 × 1014 and 5.3 × 1013 cmHz1/2W-1, 127% and 95%, as in the above order. Performance, stability, and detectivity value differences between conventional and inverted architectures are explained electrically by impedance spectroscopy.
Keywords :
aluminium; annealing; glass transition; gold; indium compounds; nanoparticles; optical multilayers; optical polymers; photodetectors; ultraviolet detectors; zinc compounds; annealing; conventional UV-PD; conventional device structure; detectivity values; external quantum efficiency values; illumination intensity; impedance spectroscopy; inverted UV-PD; inverted device structure; photoresponsivity values; poly(9,9-dioctylfluorenyl-2,7-yleneethynylene); polymer glass transition temperature; solution processed PFE:ZnO active layer; solution processed ultraviolet photodetectors; temperature 293 K to 298 K; temperature 60 degC; time 15 min; voltage -4 V; wavelength 365 nm; zinc-oxide nanoparticle hybrid; Doping; Indium tin oxide; Performance evaluation; Photodetectors; Photovoltaic cells; Polymers; Zinc oxide; Ultraviolet photodetector; hybrid system; polymer; zincoxide nanoparticle;
fLanguage :
English
Journal_Title :
Photonics Technology Letters, IEEE
Publisher :
ieee
ISSN :
1041-1135
Type :
jour
DOI :
10.1109/LPT.2014.2384532
Filename :
7001583
Link To Document :
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