mechanical modulation
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2021 ◽  
Vol 29 (21) ◽  
pp. 32853
Author(s):  
Donghai Han ◽  
Liuyang Zhang ◽  
Xuefeng Chen

2021 ◽  
Vol 5 (1) ◽  
Author(s):  
Ridwan F. Hossain ◽  
Misook Min ◽  
Liang-Chieh Ma ◽  
Shambhavi R. Sakri ◽  
Anupama B. Kaul

AbstractSilver (Ag) and graphene (Gr) inks have been engineered to serve as efficient electrical contacts for solution-processed two-dimensional (2D) organo-halide (CH3(CH2)3NH3)2(CH3NH3)n−1PbnI3n+1 (n = 4) layered perovskites, where all inkjet-printed heterostructure photodetectors (PDs) were fabricated on polyimide (PI) substrates. To date, limited studies exist that compare multiple contacts to enable high-performance engineered contacts to 2D perovskites. Moreover, of these few reports, such studies have examined contacts deposited using vapor-based techniques that are time-consuming and require expensive, specialized deposition equipment. In this work, we report on the inkjet printed, direct contact study of solution-processed, 2D perovskite-based PDs formed on flexible PI substrates. Solution processing offers a cost-effective, expedient route for inkjet printing Gr and Ag using a dispersion chemistry developed in this work that is compatible with the underlying 2D perovskite layer to construct the PDs. The wavelength λ-dependent photocurrent Ip peaked at λ ~ 630 nm for both PDs, consistent with the bandgap Eg ~ 1.96 eV for our semiconducting 2D perovskite absorber layer. The external quantum efficiency was determined to be 103% for Ag-perovskite PDs, where strain-dependent bending tests were also conducted to reveal the opto-mechanical modulation of the photocurrent in our devices.


2021 ◽  
Vol 32 (2) ◽  
pp. 311-317
Author(s):  
Deepak Karna ◽  
Morgan Stilgenbauer ◽  
Sagun Jonchhe ◽  
Kazuya Ankai ◽  
Ibuki Kawamata ◽  
...  

2021 ◽  
Vol 29 (2) ◽  
pp. 1037
Author(s):  
HongQian Mu ◽  
TongBiao Wang ◽  
DeJian Zhang ◽  
WenXing Liu ◽  
TianBao Yu ◽  
...  

Author(s):  
Christina Conrad ◽  
Kaitlin Moore ◽  
William Polacheck ◽  
Imran Rizvi ◽  
Giuliano Scarcelli

2020 ◽  
Vol 30 (40) ◽  
pp. 2004597 ◽  
Author(s):  
Min Yen ◽  
Yu‐Hong Lai ◽  
Chang‐Yang Kuo ◽  
Chien‐Te Chen ◽  
Chun‐Fu Chang ◽  
...  

2020 ◽  
Vol 8 (24) ◽  
pp. 7033-7081
Author(s):  
Kamol Dey ◽  
Elena Roca ◽  
Giorgio Ramorino ◽  
Luciana Sartore

This work provides a comprehensive view on how multiple mechanical cues of the substrate influence fundamental cellular processes, including spreading, proliferation, migration and differentiation, towards 3D tissue constructs.


Materials ◽  
2019 ◽  
Vol 12 (7) ◽  
pp. 1141 ◽  
Author(s):  
Jiayu Ma ◽  
Yuzhi Zhang ◽  
Lingnan Wu ◽  
Haogeng Li ◽  
Lixin Song

Thermal control materials are employed to adjust the temperature of a spacecraft operating in deep space. The spectral emissivity is a crucial factor in evaluating the thermal radiative properties of such materials. An apparatus, composed of a Fourier transform infrared spectrometer (FTIR), a sample cooling chamber and a mechanical modulation system was demonstrated to measure low temperature infrared spectral emissivity under vacuum. The mechanical modulation system, which includes a chopper and a lock-in amplifier, is employed to reduce the interference of background radiation during measurements. The limitation of the Fourier transform frequency on the chopper frequency can be eliminated by setting the FTIR on step-scan mode. The apparatus is separated into two parts and evacuated by different pumps. In this study, a high quality emission spectrum of a sample is measured by the apparatus. The spectral emissivity of thermal control materials are obtained in the wavelength range of 8 to 14 μm at 173 and 213 K. The combined standard uncertainty of the apparatus is 3.30% at 213 K.


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