@article{pecunia_petti_andrews_ollearo_gelinck_nasrollahi_jailani_li_kim_ng_et al._2024, title={Roadmap on printable electronic materials for next-generation sensors}, volume={8}, ISSN={["2399-1984"]}, DOI={10.1088/2399-1984/ad36ff}, abstractNote={Abstract The dissemination of sensors is key to realizing a sustainable, ‘intelligent’ world, where everyday objects and environments are equipped with sensing capabilities to advance the sustainability and quality of our lives—e.g. via smart homes, smart cities, smart healthcare, smart logistics, Industry 4.0, and precision agriculture. The realization of the full potential of these applications critically depends on the availability of easy-to-make, low-cost sensor technologies. Sensors based on printable electronic materials offer the ideal platform: they can be fabricated through simple methods (e.g. printing and coating) and are compatible with high-throughput roll-to-roll processing. Moreover, printable electronic materials often allow the fabrication of sensors on flexible/stretchable/biodegradable substrates, thereby enabling the deployment of sensors in unconventional settings. Fulfilling the promise of printable electronic materials for sensing will require materials and device innovations to enhance their ability to transduce external stimuli—light, ionizing radiation, pressure, strain, force, temperature, gas, vapours, humidity, and other chemical and biological analytes. This Roadmap brings together the viewpoints of experts in various printable sensing materials—and devices thereof—to provide insights into the status and outlook of the field. Alongside recent materials and device innovations, the roadmap discusses the key outstanding challenges pertaining to each printable sensing technology. Finally, the Roadmap points to promising directions to overcome these challenges and thus enable ubiquitous sensing for a sustainable, ‘intelligent’ world.}, number={3}, journal={NANO FUTURES}, author={Pecunia, Vincenzo and Petti, Luisa and Andrews, Joseph B. and Ollearo, Riccardo and Gelinck, Gerwin H. and Nasrollahi, Bahareh and Jailani, Javith Mohammed and Li, Ning and Kim, Jong H. and Ng, Tse Nga and et al.}, year={2024}, month={Sep} }
 @article{alshogeathri_cao_kim_yang_2023, title={Gel growth and characterization of Cs3Bi2Br9 perovskite single crystals for radiation detection}, volume={11}, ISSN={2296-424X}, url={http://dx.doi.org/10.3389/fphy.2023.1129301}, DOI={10.3389/fphy.2023.1129301}, abstractNote={Metal halide perovskites have been sought for ionizing radiation detection due to their tunable bandgap, high quantum yield, high absorption coefficient, excellent charge transport properties, flexible chemistry synthesis and cost-effective manufacturing. Among the family of perovskites, bismuth-based halide perovskites have attracted a rapidly growing interest as possible alternatives to lead-based halide perovskites in the development of nontoxic perovskites for opto-electronic devices. Herein, bismuth-based inorganic perovskite Cs 3 Bi 2 Br 9 single crystals were successfully grown using an innovative dual-diffusion gel growth technique for the first time. Silica gel has been developed as an enabling medium for gel growth of single crystals due to its transparency and easy control of nucleation sites. The UV-vis transmission spectrum was recorded using a light source of deuterium and halogen lamps and a Tauc plot was obtained, which gave an estimate of the bandgap energy, 2.54 eV. Silver electrodes were used on the top surface and the bottom surface of Cs 3 Bi 2 Br 9 single crystals for material characterization and detector tests. Current-voltage (I-V) measurements gave a room-temperature resistivity of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="m1"><mml:mrow><mml:mn>1.79</mml:mn><mml:mo>×</mml:mo><mml:msup><mml:mn>10</mml:mn><mml:mn>11</mml:mn></mml:msup><mml:mtext> </mml:mtext><mml:mi mathvariant="normal">Ω</mml:mi><mml:mo>•</mml:mo><mml:mi mathvariant="normal">c</mml:mi><mml:mi mathvariant="normal">m</mml:mi></mml:mrow></mml:math> . The Cs 3 Bi 2 Br 9 single crystals were then tested for X-ray response using ON\OFF testing which revealed attractive responsiveness for X-ray photons (rise and fall time: <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="m2"><mml:mrow><mml:mo>≈</mml:mo><mml:mn>0.3</mml:mn><mml:mtext> </mml:mtext><mml:mi>s</mml:mi></mml:mrow></mml:math> ). Using the net current ( <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="m3"><mml:mrow><mml:msub><mml:mi>I</mml:mi><mml:msub><mml:mi>X</mml:mi><mml:mrow><mml:mi>r</mml:mi><mml:mi>a</mml:mi><mml:mi>y</mml:mi></mml:mrow></mml:msub></mml:msub><mml:mo>−</mml:mo><mml:msub><mml:mi>I</mml:mi><mml:mrow><mml:mi>d</mml:mi><mml:mi>a</mml:mi><mml:mi>r</mml:mi><mml:mi>k</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math> ), which can be extracted from the X-ray response measurements at varied applied voltages, a modified Hecht fitting was applied to estimate the mobility-lifetime product of electrons, <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="m4"><mml:mrow><mml:mi>μ</mml:mi><mml:mi>τ</mml:mi><mml:mo>=</mml:mo><mml:mn>5.12</mml:mn><mml:mo>×</mml:mo><mml:msup><mml:mn>10</mml:mn><mml:mrow><mml:mo>−</mml:mo><mml:mn>4</mml:mn></mml:mrow></mml:msup><mml:mtext> </mml:mtext><mml:mo>±</mml:mo><mml:mn>6.70</mml:mn><mml:mo>×</mml:mo><mml:msup><mml:mn>10</mml:mn><mml:mrow><mml:mo>−</mml:mo><mml:mn>5</mml:mn></mml:mrow></mml:msup><mml:mtext> </mml:mtext><mml:mi>c</mml:mi><mml:msup><mml:mi>m</mml:mi><mml:mn>2</mml:mn></mml:msup><mml:mo>/</mml:mo><mml:mi>V</mml:mi></mml:mrow></mml:math> for a Ag/Cs 3 Bi 2 Br 9 /Ag device. This study shows that our innovative crystal growth method, enabled by the unique gel growth process, can be used as an appealing technique to grow functional crystals for opto-electronic devices. Meanwhile, Cs 3 Bi 2 Br 9 has shown great potential as a promising candidate for X-ray detection applications. The efforts in this work will serve as a metric for growing halide perovskites in the gel for opto-electronic devices.}, journal={Frontiers in Physics}, publisher={Frontiers Media SA}, author={Alshogeathri, Saqr and Cao, Da and Kim, Doup and Yang, Ge}, year={2023}, month={Mar} }
 @article{kim_yang_2022, title={Perovskite materials: from single crystals to radiation detection}, ISSN={["1466-8033"]}, DOI={10.1039/d2ce00637e}, abstractNote={Pb- and Bi-based perovskite materials have high potential for detecting ionizing radiation but an enhanced research effort is needed to achieve large-size, high-performance single crystals at a competitive cost to accelerate this development.}, journal={CRYSTENGCOMM}, author={Kim, Doup and Yang, Ge}, year={2022}, month={Jun} }