High photoresponse from solution processed conventional and inverted ultraviolet photodetectors

Authors : Görkem MEMİŞOĞLU, Canan VARLIKLI

Pages : 4208-4217

View : 9 | Download : 7

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :The optical and electrical properties of conventional and inverted type ultraviolet photodetectors insert ignore into journalissuearticles values(UVPDs); with active layers of polyinsert ignore into journalissuearticles values(9,9-dioctylfluorenyl-2,7-ylenethynylene insert ignore into journalissuearticles values(PFE);, $N$,$N`$-bis-$n$-butyl-1,4,5,8-naphthalenediimide insert ignore into journalissuearticles values(BNDI);, and zincoxide insert ignore into journalissuearticles values(ZnO); are introduced. Optimized devices showed high photoresponse, external quantum efficiency insert ignore into journalissuearticles values(EQE);, and detectivity insert ignore into journalissuearticles values(D*); values. Under 365 nm 1 mW/cm$^{2}$, the conventional device insert ignore into journalissuearticles values(ITO/PEDOT:PSS/[insert ignore into journalissuearticles values(PFE:BNDI); insert ignore into journalissuearticles values(3:1);:8 wt% ZnO]/Al); and the inverted device insert ignore into journalissuearticles values(ITO/[insert ignore into journalissuearticles values(PFE:BNDI);insert ignore into journalissuearticles values(3:1);:8 wt% ZnO]/Au); gave photoresponsivities of 515 mA/W and 316 mA/W, D* of 1.12 $\times$ 10$^{14 }$Jones and 0.71 $\times$ 10$^{14 }$Jones, and EQE of 174% and 107%, respectively. Annealing the devices at polymer`s glass transition temperature insert ignore into journalissuearticles values(T$_{g}$ 60 $^{\circ}$ C);, enhanced these values to 651 mA/W and 343 mA/W, 1.33 $\times$ 10$^{14 }$Jones and 0.73 $\times$ 10$^{14 }$ Jones, and 221% and 116%, respectively. Furthermore, high performance, sensitivity, D*, and EQE values of different architectures were examined by impedance spectroscopy.
Keywords : Ultraviolet photodetector, hybrid system, zinc oxide nanoparticle, polymer, impedance spectroscopy