Photocurrent study of all-printed photodetectors on paper made of different transition metal dichalcogenide nanosheets

We have inkjet-printed in-plane 'metal-semiconductor-metal' type photodetectors on paper, one of the cheapest flexible substrates, which is also recyclable and foldable, in contrast to traditional plastic substrates. The photodetectors are made by using graphene as electrodes and various transition metal dichalcogenides (TMDs) as photoactive component. In particular, we have tested MoS2, WS2, MoSe2 and MoTe2. Large differences in responsivity and sensitivity were observed for all of the TMDs measured, with MoS2 showing the highest sensitivity and MoTe2 producing the largest response. However, photodetectors made of MoTe2 show large decreases in responsivity after one week of exposure to air. The wavelength dependence of the responsivity in MoS2 based devices was further analyzed using a supercontinuum photocurrent spectroscopy setup, with the results suggesting a bolometric or photoelectric origin of the signal. We also report some simple approaches to enhance the device performance and tune the energy range at which the maximum in responsivity or sensitivity is observed

Microwave metrology for superconducting quantum circuits

Quantum technologies and quantum computing offer exciting new possibilities but also significant challenges that must be overcome to achieve their potential, including the need for fundamental microwave metrology at cryogenic temperatures to support the booming quantum technology industry. The European SuperQuant project, which is introduced in this contribution, aims at establishing novel metrological and scientific tools for the measurement of microwave signals in circuits in-situ in cryogenic environments down to the millikelvin range using a combination of superconducting, semiconducting, integrated and conventional photonics, and plasmonic techniques