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Self-suspended nanomesh scaffold for ultrafast flexible photodetectors based on organic semiconducting crystals

Our group was involved in a study of transient photocurrent responses of self‐standing nanostructures. These devices are of fundamental interest in materials science and nanoscience and are widely used in (opto‐)electronic and photonic devices as well as in micro‐electromechanical systems. … Continue reading

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Negative field-dependent charge mobility in crystalline organic semiconductors with delocalized transport

Charge-carrier mobility has been investigated by time-of-flight (TOF) transient photocurrent in a lateral transport configuration in highly crystalline thin films of 2,7-dioctyl[1]benzothieno [3,2-b][1] benzothiophene (C8-BTBT) grown by a zone-casting alignment technique. High TOF mobility has been revealed that it is … Continue reading

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The effect of polymer molecular weight on the performance of PTB7-Th:O-IDTBR non-fullerene organic solar cells

Our group has been involved in a collaborative approach to study non-fullerene organic solar cells. Recent advances in the development of non-fullerene acceptors have increased the power conversion efficiency of organic solar cells to approximately 13%. Fullerene-derivatives and non-fullerene acceptors … Continue reading

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Charge carrier transport in polycrystalline CH3NH3PbI3 perovskite thin films in a lateral direction characterized by time-of-flight photoconductivity.

We used time-of-flight photocurrent measurements to determine the role of grain boundaries in charge carrier transport in thin layers of methyl ammonium lead iodide (CH3NH3PbI3). The measurement results were compared to Kinetic Monte Carlo simulations, based on a transport model, … Continue reading

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Fast-response photonic device based on organic-crystal heterojunctions assembled into a vertical-yet-open asymmetric architecture.

Our group was involved in collaboration to investigate fast photocurrent transients of crystalline dioctyl‐3,4,9,10‐perylenedicarboximide nanowires and 6,13‐bis(triisopropylsilylethynyl) pentacene microplates , which were integrated into a vertical‐yet‐open asymmetrical heterojunction for the realization of a high‐performance organic photovoltaic detector, which shows fast … Continue reading

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The role of local potential minima on charge transport in thin organic semiconductor layers

We have performed a systematic study of dependence of time-resolved photocurrent on the point of charge excitation within the organic semiconductor channel formed by two coplanar metal electrodes. The results confirm that spatial variation of electric field between the electrodes … Continue reading

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Evidence of enhanced photocurrent response in corannulene films

We have been measuring photoconductivity spectra in non-crystalline corannulene thin layers and compared them to optical absorption in solution phase and thin films. The unexpected enhanced photoconductivity is correlated with GW–BSE theoretical predictions of corannulene gas-phase excitonic spectra. Theoretical analysis … Continue reading

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Role of transport band edge variation on delocalized charge transport in high-mobility crystalline organic semiconductors

Thorough investigation of fast charge transport through large single-crystal organic semiconducting layers elucidated a new type of charge transport. Together with colleagues from Belgium, Ukraine, Slovenia and Germany, we demonstrate that the degree of charge delocalization has a strong impact … Continue reading

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Interface-controlled growth of organic semiconductors on graphene

We have studied submonolayer coverages of N,N-1H,1H-perfluorobutyl dicyanoperylenecarboxydiimide (PDIF-CN2) on mechanically exfoliated graphene transferred onto SiO2 substrates. Our atomic force microscopy (AFM) data show that PDIF-CN2 forms irregularly-shaped 1.4  nm-high islands. From the selected area diffraction performed with transmission electron … Continue reading

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Fast-Response Photonic Device Based on Organic-Crystal Heterojunctions Assembled into a Vertical-Yet-Open Asymmetric Architecture

Organic semiconductor, due to their excellent interaction with light, could be made into photosensors. The scientists of the Laboratory of Organic Physics have been working together with colleagues from University of Strasbourg and CNR Bologna on novel forms of photonic … Continue reading

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