Solution-Processed Green-Sensitive Organic Photoconductive Device Using Rhodamine 6G

Abstract

Since rhodamine 6G (R6G) has the selective absorption band at the green wavelength regions, the green-sensitive organic photoconductive device was demonstrated using R6G as a photoconductive layer. By optimizing the conductivity of poly (3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) used as the carrier transport layer and the concentration of R6G, the maximum external quantum efficiency of 32.6% was obtained at the electric field of −34 MV/m. We found that the low-conductivity of the PEDOT:PSS layer was most important factor for the improved device performance. In addition, the signal-to-noise ratio (photocurrent/dark current) was improved by reducing the conductivity of the PEDOT:PSS layer, and the highest value of 60 was achieved.

Raman enhancement on ultra-clean graphene quantum dots produced by quasi-equilibrium plasma-enhanced chemical vapor deposition

“…4a, d , Supplementary Fig. 15 ), the highest occupied molecular orbital (HOMO) level of R6G is located near the Fermi level (at −0.08 eV), close to that of graphene 42 , 43 . Under laser irradiation, Raman scattering is generated by three steps according to the Feynman diagram (Supplementary Fig.…”

Enhanced SERS Stability of R6G Molecules with Monolayer Graphene

“…The molecules at excitation state either relax to the ground state or react with ambient environment. In the R6G/G/Ag and G/R6G/Ag structures, the xanthenes ring of R6G molecules lie parallel to the graphene surface. , The Fermi level of graphene (∼4.6 eV) lies between LUMO (∼3.28 eV) and HOMO (∼5.35 eV) energy level of R6G molecules. − R6G molecules form π–π bonding with graphene, allowing the charge transfer between graphene and R6G molecules. Graphene provides additional path for the molecules to relax from the excitation state to the ground state, and reduces the number of molecules at the excitation state .…”

Organic Photodiodes: The Future of Full Color Detection and Image Sensing

“…[ 226 ] By doping 30 wt% of R6G ( N3 ) into PFO ( N2 ), Fukuda et al fabricated a green-sensitive OPD with an EQE of 33% at −34 MV/m (thickness of N3 = 130 nm) and an absorbance FWHM of ≈95 nm. [ 227 ] The spectral photoresponse (EQE) of the device was unfortunately not provided. The effect of doping four different silole derivatives (as visible-blind electron accepting materials) within a fi lm of N3 was subsequently investigated.…”