title: Green-sensitive organic photodetectors with high sensitivity and spectral selectivity using subphthalocyanine derivatives.
abstract: Green-sensitive organic photodetectors (OPDs) with high sensitivity and spectral selectivity using boron subphthalocyanine chloride (SubPc) derivatives are reported. The OPDs composed of SubPc and dicyanovinyl terthiophene derivative (DCV3T) demonstrated the highest green-sensitivity with maximum external quantum efficiency (EQE) of 62.6 % at an applied voltage of -5 V, but wide full-width-at-half-maximum (FWHM) of 211 nm. The optimized performance considering spectral selectivity was achieved from the composition of N,N-dimethyl quinacridone (DMQA) and SubPc showing the high specific detectivity (D*) of 2.34 × 10(12) cm Hz(1/2)/W, the EQE value of 60.1% at -5 V, and narrow FWHM of 131 nm. In spite of the sharp absorption property of SubPc with the maximum wavelength (λmax) at 586 nm, the EQE spectrum showed favorable green-sensitivity characterized by smooth waveform with λmax at 560 nm, which is induced from the high reflectance of SubPc centered at 605 nm. The photoresponsivity of the OPD devices was found to be consistent with their absorptance. Optimized DMQA/SubPc device showed the lowest value of blue crosstalk (0.42) and moderate red crosstalk (0.37), suggesting its promising application as a green-sensitive OPD.
authors.affiliation: Emerging Materials Center, Samsung Advanced Institute of Technology, Samsung Electronics Co. , Yongin 446-712, Republic of Korea.
authors.forename: Kwang-Hee
authors.initials: KH
authors.lastname: Lee
authors.forename: Dong-Seok
authors.initials: DS
authors.lastname: Leem
authors.forename: Jeffrey S
authors.initials: JS
authors.lastname: Castrucci
authors.forename: Kyung-Bae
authors.initials: KB
authors.lastname: Park
authors.forename: Xavier
authors.initials: X
authors.lastname: Bulliard
authors.forename: Kyu-Sik
authors.initials: KS
authors.lastname: Kim
authors.forename: Yong Wan
authors.initials: YW
authors.lastname: Jin
authors.forename: Sangyoon
authors.initials: S
authors.lastname: Lee
authors.forename: Timothy P
authors.initials: TP
authors.lastname: Bender
authors.forename: Soo Young
authors.initials: SY
authors.lastname: Park