Highly sensitive wide range organic photodiode based on zinc phthalocyanine:C₆₀

Abstract

We report on the preparation and characterization of a highly sensitive organic photodiode for the entire visible part of the spectrum. The photodiode is based on a small molecule heterojunction layer of zinc phthalocyanine (ZnPC) and fullerene C 60 and is prepared by multistep vacuum deposition technique. Investigation is performed under different illumination conditions, from spectrally broad to narrow line, cw and pulsed, to determine linearity of operation, responsivity, quantum efficiency, dark current, and detectivity. The experimental results in combination with a simple device stack favor ZnPC:C 60 as active layer in organic photodiodes, e.g., for opto-electronic sensor systems.

Organic Light‐Emitting Transistors in a Smart‐Integrated System for Plasmonic‐Based Sensing

“…Top‐absorbing OPDs showed current–voltage responses with a good diode‐like behavior (Figure 1e) characterized by a low dark current density <600 nA cm −2 at −0.2 V and a short‐circuit photogenerated current density ( J sc ) of 10.0 µA cm −2 under low light illumination of 230 µW cm −2 with AM1.5G spectrum. OPDs exhibited an external quantum efficiency (EQE) (Figure 2) of ≈20% in the spectral range 610–800 nm, [ 48–50 ] in great agreement with the OLET optical emission. In view of implementing the OPD into the optoplasmonic system, the linearity of the OPD response as a function of light intensity was verified with illumination at 766 nm (Figure S2, Supporting Information), i.e., the OLET peak wavelength.…”

“…Accordingly, top‐absorbing OPDs responding in the same spectral region were developed by using a photoactive layer based on a blend of zinc phthalocyanine (ZnPc) and fullerene‐C 60 for its spectral response in the NIR region. [ 48 ] Figure 1d shows the OPD architecture in which a reflective anode and a semitransparent cathode were respectively used as the bottom and the top electrode. In a first step, 1 cm 2 reference devices on bare glass were prepared for device characterization.…”

On-chip organic optoelectronic system for fluorescence detection

“…A blend of zinc phtalocyanine and fullerene was selected as active layer of the OPD, due to the wide spectral response in the visible range that is suitable to detect the fluorescence emission of LD700. 38,39 A top-adsorbing OPD structure (Fig. S1a, ESI †) was optimized in terms of electrical and optical characteristics by tuning the type and thickness of interlayers and by introducing a refractive index matching layer (IML) onto the semi-transparent cathode to obtain a device that is highly sensitive at the peak wavelength of emission of LD700, that is 680 nm (Fig.…”

Flexible near-infrared polarized photodetector based on CuPc single crystal grown by microspacing in-air sublimation

“…MPcs exhibit outstanding advantages, including efficient light absorption, high mobilities, and cost-effectiveness. In the past few years, a large number of photon sensors have been demonstrated in MPcs and their derivatives devices, such as CuPc, [19][20][21][22] ZnPc, 21,23 CoPc, 24 NiPc, 25 and PbPc. 26 However, most efforts have focused on the UV and visible ranges, and the exploration for the NIR region is rare.…”