-Chia Chen

Photoresponses and memory effects in organic thin film transistors incorporating poly(3-hexylthiophene)/CdSe quantum dots

This paper describes the optical responses and memory effects of poly(3-hexylthiophene) (P3HT)/CdSe quantum dot (QD) thin-film transistors (TFTs). TFTs incorporating P3HT/CdSe QD blends as the active layer exhibited higher photocurrents than did the corresponding P3HT-only devices because the heterojunction between P3HT and the CdSe QDs enhanced the separation of excitons. Moreover, the CdSe QDs served as trap centers so that the memory effect was maintained for several hours, even when the device was operated without a gating voltage. Here, we demonstrate the potential applicability of such P3HT/CdSe QD TFTs through repeated optical programming and electrical erasing.

Characteristics of Gate-All-Around Twin Poly-Si Nanowire Thin-Film Transistors

We have investigated the characteristics of gate-all-around (GAA) twin polycrystalline-silicon nanowire (NW) thin-film transistors (TFTs). The NW channel and surrounding gate imparted the GAA twin NW TFT with superior channel controllability. Moreover, the combination of the high surface-to-volume ratio of the NW and the split channel structure led to highly efficient NH3 plasma treatment, which reduced the effective grain-boundary trap-state density. The GAA twin NW TFT exhibited greatly improved electrical performance, including a lower threshold voltage, a steeper subthreshold swing (114 mV/dec), a higher on/off current ratio (> 108), and a virtual absence of drain-induced barrier lowering (13 mV/V).

Electrical bistable memory device based on a poly(styrene-b-4-vinylpyridine) nanostructured diblock copolymer thin film

This paper describes the performance of a nonvolatile memory device based on a solution-processed poly(styrene-b-4-vinylpyridine) (PS-b-P4VP) diblock copolymer thin film. The Al/PS-b-P4VP/indium tin oxide memory device featuring metal-coordinated 30 nm P4VP cores exhibited an ON/OFF ratio of 2×105, an erase voltage of 0.75 V, a write voltage of −0.5 V, and a retention time of 104 s. The device exhibited a metallic behavior in the ON state, suggesting the formation of metallic filaments through the migration of Al atoms into the P4VP domain during writing. Such nanostructured diblock copolymer thin films open up avenues for fabricating organic memory devices using simple procedures.

A Wireless and Batteryless Intelligent Carbon Monoxide Sensor.

Carbon monoxide (CO) poisoning from natural gas water heaters is a common household accident in Taiwan. We propose a wireless and batteryless intelligent CO sensor for improving the safety of operating natural gas water heaters. A micro-hydropower generator supplies power to a CO sensor without battery (COSWOB) (2.5 W at a flow rate of 4.2 L/min), and the power consumption of the COSWOB is only ~13 mW. The COSWOB monitors the CO concentration in ambient conditions around natural gas water heaters and transmits it to an intelligent gateway. When the CO level reaches a dangerous level, the COSWOB alarm sounds loudly. Meanwhile, the intelligent gateway also sends a trigger to activate Wi-Fi alarms and sends notifications to the mobile device through the Internet. Our strategy can warn people indoors and outdoors, thereby reducing CO poisoning accidents. We also believe that our technique not only can be used for home security but also can be used in industrial applications (for example, to monitor leak occurrence in a pipeline).

Low-cost electronic dose counter for pressurized metered dose inhaler

One of the hardest parts of controlling asthma is making sure patients are getting the right does of medicine through their inhaler based on doctors instructions. However, the patients, especially children, frequently miss doses or even forget to use it. In this study, our proposed electronic dose counter directly attached to pressurized metered dose inhaler without modification original inhaler structure, that is used to record the times and timestamps of doses actuated by patients. The dose information automatically uploads and displays in an inhaler APP ran on a smartphone. Moreover, the inhaler APP also reminds the patients when they forget to use it in right time. Overall cost of the electronics dose counter is ~

Smart electronic dose counter for pressurized metered dose inhaler

5. Our low-cost smart inhaler counter with inhaler APP could be lowered healthcare cost and saved lives.

Low-cost hall-effect sensors for real-time monitoring pier scour

According to Global Asthma Report 2014, asthma may affect as many as 334 million people today and prevalence. While symptoms and severity vary from person to person, asthma can be deadly in some circumstances. Asthma can be controlled by medicine. However, one of the hardest parts of controlling asthma is making sure patients are getting the right does of medicine through their inhaler based on doctors instructions. However, the patients, especially children, frequently miss doses or even forget to use it. In this study, our proposed electronic dose counter directly attached to pressurized metered dose inhaler without modification original inhaler structure, that is used to record the times and timestamps of doses actuated by patients. The dose information automatically uploads and displays in an inhaler APP ran on a smartphone. Moreover, the inhaler APP also reminds the patients when they forget to use it in right time. Overall cost of the electronics dose counter is ~

Selective functionalization on ultra-thin body FETs

5. Our low-cost smart inhaler counter with inhaler APP could be lowered healthcare cost and saved lives.

Performance of dual-channel gate-all-around polysilicon nanowire thin-film transistor

Our proposed scour monitoring system utilized low-cost commercial sensors, hall-effect sensors (unit price <;

An optical programming/electrical erasing memory device: Organic thin film transistors incorporating core/shell CdSe@ZnSe quantum dots and poly(3-hexylthiophene)

1) that is capable of real-time measuring bridge pier scour with resolution of ca. 2.5 cm, and overall cost for single sensor node of our work is at least 40% less expensive than existing work. The hall-effect sensor is evaluated under controlled conditions in a laboratory flume. After scour event, the typical voltage change of the hall-effect sensor is ~ 300 mV, and the system achieves signal-to-noise ratio performance of 60 dB. Finally, we also provide an equation to predict the time variation of scour depth around pier model. Moreover, our system adopts master-slave architecture has scalability and flexibility for mass deployment. We believe that our system has the potential for further widespread implementation in the field.