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Journals and Conferences
With the explosion in the number of battery-powered portable devices, ubiquitous powering stations that exploit energy harvesting can provide an extremely compelling means of charging. We present a system on a flexible sheet that, for the first time, integrates the power electronics using the same thin-film amorphous-silicon (a-Si) technology as that used… (More)
This paper presents an energy-harvesting system consisting of amorphous-silicon (a-Si) solar cells and thin-film-transistor (TFT) power circuits on plastic. Along with patterned planar inductors, the TFTs realize an LC-oscillator that provides power inversion of the DC solar-module output, enabling a low-cost sheet for inductively-coupled wireless charging… (More)
—Early-stage damage detection for bridges requires continuously sensing strain over large portions of the structure, yet with centimeter-scale resolution. To achieve sensing on such a scale, this work presents a sensing sheet that combines CMOS ICs, for sensor control and readout, with large-area electronics (LAE), for many-channel distributed sensing and… (More)
Early-stage damage detection for buildings and bridges requires continuously sensing and assessing strain over large surfaces , yet with centimeter-scale resolution. To achieve this, we present a sensing sheet that combines high-performance ICs with flexible electronics, allowing bonding to such surfaces. The flexible electronics integrates thin-film strain… (More)
Large-area electronics presents new form factors, enabling ubiquitous systems that are flexible and capable of scaling to very large areas. By processing thin-film transistors (TFTs) at low temperatures on plastic (using organics, amorphous silicon, metal oxides, etc.), blocks such as ADCs, amplifiers, and processors can be realized [1,2]; however, aside… (More)
(141 Strain including sensor noise), at an energy/meas. of 148 nJ and 286 nJ for readout and sensor-accessing control, respectively. The communication subsystem achieves an energy/bit of 14.6 pJ/4.3 pJ (Tx/Rx) at a distance of 7.5 m and a data rate of 2 Mb/s.
\ Hybrid systems based on large-area electronics (LAE) and CMOS ICs aim to exploit the complementary strengths of the two technologies: the scalability of LAE for forming interconnects and transducers (for sensing and energy harvesting), and the energy efficiency of CMOS for instrumentation and computation. The viability of large-scale systems depends on… (More)
2 solar module under indoor lighting conditions (∼400 μW/cm 2), the system is measured to provide 1) dc power (∼1 mW) to on-sheet loads and 2) ac power (∼10 mW) to off-sheet loads through wireless transmission. Four Li-ion batteries are used for on-sheet energy storage with a battery-management system ensuring discharging at permissible levels, while… (More)
Capacitive touch screens have enabled compelling interfaces for displays . Three-dimensional (3D) sensing, where user gestures can also be sensed in the out-of-plane dimension to distances of 20 to 30cm, represents new interfacing possibilities that could substantially enrich user experience. The challenge is achieving sensitivity at these distances when… (More)
— We report hybrid amorphous (a-Si)/nanocrystalline (nc-Si) Schottky diodes for rectification at high frequencies. capacitive load, the dc rectified voltage drops at frequencies >10 MHz, with a −3 dB point at 70 MHz.