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  • 1.
    Lin, Lili
    et al.
    KTH, School of Biotechnology (BIO), Theoretical Chemistry and Biology.
    Geng, Hua
    Shuai, Zhigang
    Luo, Yi
    KTH, School of Biotechnology (BIO), Theoretical Chemistry and Biology.
    Theoretical insights into the charge transport in perylene diimides based n-type organic semiconductors2012In: Organic electronics, ISSN 1566-1199, E-ISSN 1878-5530, Vol. 13, no 11, p. 2763-2772Article in journal (Refereed)
    Abstract [en]

    We employed a tunneling enabled hopping model to investigate the charge transport properties for four n-type organic semiconductors perylene diimides compounds. The molecular parameters are calculated by density functional theory and the transport is modeled by kinetic Monte Carlo simulation. It is found that the substitutions at the bay positions of the perylene core have large influences on the charge transport properties through modifications in molecular conformation, the charge reorganization energy as well as the stacking networks in the crystals. The temperature dependence of the mobility shows typical "band-like", in agreement with the recent experiment, but we ascribe it to be the characteristic of nuclear tunneling effect for a localized charge, not by a delocalized band. The largest charge mobility is calculated to be 16.96 cm(2)/V s for the cyano substitution, in good comparison with the experimental value of 6 cm(2)/V s.

  • 2.
    Malti, Abdellah
    et al.
    KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
    Tu, Deyu
    Edberg, Jesper
    Sani, Negar
    Rudd, Sam
    Evans, Drew
    Forchheimer, Robert
    Electromagnetic devices from conducting polymers2017In: Organic electronics, ISSN 1566-1199, E-ISSN 1878-5530, Vol. 50, p. 304-310Article in journal (Refereed)
    Abstract [en]

    In this work, we report macroscopic electromagnetic devices made from conducting polymers. We compare their fundamental properties and device parameters with those of similar devices made from copper wires. By using self-standing supra-ampere conducting polymer wires, we are able to manufacture inductors that generate magnetic fields well over 1 G, and incorporate them in feedback LC oscillators operating at 8.65 MHz. Moreover, by utilizing the unique electrochemical functionality of conducting polymers, we demonstrate electrochemically-tunable electromagnets and electromagnetic chemical sensors. Our findings pave the way to lightweight electromagnetic technologies that can be processed (fromwater dispersions) using low-temperature protocols into flexible shapes and geometries.

  • 3.
    Yang, Kunlong
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics. State Key Laboratory of ASIC and System, Center of Micro-Nano System, School of Information Science and Technology, Fudan University, Shanghai, China.
    Yuan, S.
    Qiu, Z.
    Zhan, Y.
    Umar, A. A.
    Zheng, L.
    Seoane, F.
    Humidity effect on photoelectrical properties of photosensitive field effect transistors2019In: Organic electronics, ISSN 1566-1199, E-ISSN 1878-5530, Vol. 69, p. 42-47Article in journal (Refereed)
    Abstract [en]

    Environmental influences are critical for the reliability of photoelectric devices, especially those using organic semiconductors. Among all the influence factors, the effect of relative humidity on the material's photoelectrical properties receives less attentions. To date, reported humidity effects are mostly related to the electrical properties. Their impact to the photoelectrical characteristics has rarely been investigated. In this work, we firstly report a detailed study on the dependency of material's photoelectrical properties on the relative humidity in photosensitive field effect transistors. It was found that both the amplitude and the decay time of the photocurrent indicated a profound dependency on the humidity. To further clarify the mechanism, experiments were carefully designed along with a simulation to recognize and to provide a detailed understanding on any possible influence factors in these processes. The results indicate a prominent co-existence of carrier-trapping and dielectric-polarization phenomena in the photoelectric device under the influences of humidity. Since the water molecules in the atmosphere are predominant, the observed variation in the photoelectrical properties can be explained.

  • 4. You, Yintao
    et al.
    Yang, Kunlong
    Yuan, Sijian
    Dong, Shiqi
    Zhang, Huotian
    Huang, Qinglan
    Gillin, William P.
    Zhan, Yiqiang
    Zheng, Lirong
    KTH, School of Information and Communication Technology (ICT), Electronic Systems. KTH, School of Information and Communication Technology (ICT), Centres, VinnExcellence Center for Intelligence in Paper and Packaging, iPACK.
    An organic multilevel non-volatile memory device based on multiple independent switching modes2014In: Organic electronics, ISSN 1566-1199, E-ISSN 1878-5530, Vol. 15, no 9, p. 1983-1989Article in journal (Refereed)
    Abstract [en]

    The demand for higher data density memory structures is greater today than ever before. Multilevel resistive organic memory devices (OMD) provide an ideal solution, in being easily fabricated, cost-effective and at the same time promising high storage capacity. However, conventional methods for multilevel OMDs impose demanding requirements on material properties and attain only limited performance. We hereby provide an alternative design concept that combines multiple switching modes in one device to realize multilevel function. The device possesses a simple structure by using a ferroelectric phase-separated blend as the active layer. Two switching modes, the ferroelectric switching and the metallic filament switching, are realized simultaneously in this device, and enable a ternary storage function. The cross-section scanning electron microscope (SEM) images provide a strong evidence of the formation and annihilation of the metallic filament.

  • 5. Yuan, S.
    et al.
    Zhang, H.
    Wang, P.
    Ling, L.
    Tu, L.
    Lu, H.
    Wang, J.
    Zhan, Y.
    Zheng, Lirong
    KTH, School of Information and Communication Technology (ICT), Centres, VinnExcellence Center for Intelligence in Paper and Packaging, iPACK. Fudan University, Shanghai, China.
    High-gain broadband organolead trihalide perovskite photodetector based on a bipolar heterojunction phototransistor2018In: Organic electronics, ISSN 1566-1199, E-ISSN 1878-5530, Vol. 57, p. 7-13Article in journal (Refereed)
    Abstract [en]

    Both a favorable material and designed structure are essential for a high-performance photodetector. For the excellent physical properties of organolead trihalide perovskites, with CH3NH3PbI3 films serving as a base layer, a bipolar heterojunction phototransistor-type perovskite photodetector is proposed. Benefiting from this bipolar heterojunction structure, which is characterized by high gain and low work voltage, an optimized device exhibits high performance with a photoresponsivity of 125 AW−1 and an external efficiency of 3.62 × 104% at 427 nm with a low work voltage of 0.7 V. Additionally, such phototransistors have a broad photoresponsivity from 360 to 820 nm. These results demonstrate that the bipolar heterojunction phototransistor, which is widely used in inorganic materials, is a promising structure for organolead trihalide perovskite optoelectronic devices, paving a new way for developing high-performance photodetectors.

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