Showing papers by "Yingquan Peng published in 2020"
TL;DR: In this article, a perovskite thin film was used as the light filter for visible-blind NIR organic photodetectors by integrating a copper phthalocyanine (CuPc) electron blocking layer between the ITO anode and PbPc:C60 bulk heterojunction.
16 citations
TL;DR: In this paper, anomalous photocurrent behavior in organic field effect transistors (OFETs) based on C60 thin film was investigated and the main sources of the negative photocurrent were not the electrodes, channel and interface effect but a distinct optoelectronic property of the C60 material itself.
6 citations
TL;DR: In this article, the authors proposed to increase the Au source/drain electrode-layer thickness to 150nm for pentacene PhOFETs with bottom-gate bottom-contact geometry.
3 citations
TL;DR: In this paper, two kinds of FOPTs-single layer of copper phthalocyanine (CuPc) (SL-FOPTs) and hybrid planar bulkheterojunction (HPBHJ-OPTs), with PTCDA denotes 3,4,9,10-perylenete-acarboxylic dianhydride, with polyvinyl alcohol as the gate dielectric but different active layer, were fabricated and their strain dependent performances investigated.
2 citations
01 Jan 2020
TL;DR: In this article, hole mobility of zinc phthalocyanine (ZnPc) thin films was determined by light-intensity-dependent current-voltage characteristics, and the measured carrier mobility coincides with that reported in other literature.
Abstract: Carrier mobility is a basic parameter of organic semiconductors. In this paper, hole mobility of zinc phthalocyanine (ZnPc) thin films was determined by light-intensity-dependent current–voltage characteristics. Firstly, built-in voltage, Vbi, of the organic diode with the structure of “ITO/zinc phthalocyanine (ZnPc)/2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (BCP)/Al” was measured as 0.45 V by using saturation photovoltage method. Based on the value of Vbi, the hole mobility of ZnPc thin film was (1.619 ± 0.06) × 10−6 cm2 V−1 s−1 by fitting the measured photocurrent–voltage characteristic with the established theory of space-charge-limited photocurrent conduction. The measured carrier mobility coincides with that reported in other literature.
1 citations
01 Jan 2020
TL;DR: In this article, a high photosensitivity (NIR) organic field effect transistors (PhOFETs) based on lead phthalocyanine (PbPc):C60 bulk heterojunction were proposed.
Abstract: Near-infrared (NIR) photosensitivity organic field-effect transistors (PhOFETs) have drawn substantial attention due to their applications in the field of industry and science. It is difficult to fabricate the device with high photosensitivity and high photoresponsivity, which greatly limits their development. In this paper, a high photosensitivity (NIR) PhOFETs based on lead phthalocyanine (PbPc):C60 bulk heterojunction were proposed. For NIR light with a wavelength of 808 nm, the device exhibited a relative high photosensitivity through the applied gate voltage and the maximum photosensitivity as high as 2300, which was attributed to the inherent high exciton dissociation efficiency and the relatively low carrier mobility of the BHJ active layer.
01 Jan 2020
TL;DR: In this article, the relationship between channel length and photo-generated current was explored and it was shown that the photo generated current generated by planar photodiode at weak light is hardly affected by the channel length.
Abstract: In this paper, planar photodiodes based on perovskite were fabricated and characterized. We explored the relationship between channel length and photo-generated current. The study demonstrates that the photo-generated current generated by planar photodiode at weak light is hardly affected by the channel length. However, due to the influence of the diffusion mechanism, the photo-generated current gradually increases with the channel length under strong light. Our study provides a reasonable explanation for the diffusion mechanism of photo-generated carriers in horizontal structure.
01 Jan 2020
TL;DR: In this article, the authors used palladium phthalocyanine (PdPc) active layer with different thickness to obtain the best photoresponsivity of 1.47 mA/W and the maximum saturation field-effect mobility of 2.88 × 10−3 cm2/Vs.
Abstract: In this study, photosensitive organic field-effect transistors (PhOFETs) based on palladium phthalocyanine (PdPc) active layer with different thickness were fabricated and characterized. The photoelectric measurement results demonstrated that the device with 46.7-nm-thick PdPc film exhibited the best photoresponsivity of 1.47 mA/W and the maximum saturation field-effect mobility of 1.88 × 10−3 cm2/Vs in all devices. In addition, for drain voltage Vd = −50 V and gate voltage Vg = −50 V, the device photosensitivity of 20-nm-thick PdPc film reached a maximum at 5.77 compared with other devices in the same condition. Herein, we assumed that the different characteristics with a series thickness were dependent on the grain size and contact resistances in PdPc films. For which the grain size in PdPc films increased to a certain thickness around 46.7 nm and exhibited improved PhOFETs performances. Hereafter, the performance declined due to increasing contact resistances with thickness.
01 Jan 2020
TL;DR: In this article, an analytical expression between the dark current density and array size was obtained, and a circuit model was constructed to analyze the cause of this phenomenon, and the analytical expression was obtained for 3 × 2 (Sample A), 4 × 3 (Sample B), 5 × 4 (Sample C), and 6 × 5 (Sample D).
Abstract: Organic photodiode array has recently attracted a lot of attention for large-area light detection applications and imaging. In this work, Organic photodiode 3 × 2 (Sample A), 4 × 3 (Sample B), 5 × 4 (Sample C), and 6 × 5 (Sample D) arrays based on copper phthalocyanine (CuPc)/C60 planar heterojunction in which CuPc used as optical sensitive material were fabricated and characterized. It is found that the dark current density of the device increases as the array increases through experimental data. A circuit model was constructed to analyze the cause of this phenomenon, and an analytical expression between dark current density and array size was obtained.
01 Jan 2020
TL;DR: In this article, high-sensitive flexible organic phototransistors with an organic thin film of copper phthalocyanine (CuPc) as an active layer were prepared.
Abstract: Highly photosensitive flexible organic phototransistors (OPTs) with an organic thin film of copper phthalocyanine (CuPc) as an active layer were prepared. The performance was investigated in different bending cycles. The photo responsivity reduced to 147.2 mA/W from the initial 253 mA/W and the photocurrent to 1510 nA from the initial 2300 nA after 20 cycles; while for bending cycle of 100 and 200, the photo responsivity and photocurrent kept almost unchanged.