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정찬배,이재란,강만일,Sok Won Kim 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.65 No.7
Changes in the diffusion properties of three kinds of fluorescent particles, Alexa Fluor 647, Q-dots(quantum dots), and beads, with temperature were investigated with a home-built fluorescencecorrelation spectroscopy (FCS) system based on a confocal microscope. In all samples, as thetemperature was increased, the diffusion times were reduced, indicating an increase in the diffusioncoefficient. In particular, of all the particles, Alexa Fluor 647 having the smallest size of 1 nm,showed a hydrodynamic radius that increased with increasing temperature of the solvent. However,for the Q-dots and beads with larger sizes, the hydrodynamic radius of the particles was inverselyproportional to the temperature. These results show that diffusion coefficient obtained by changingthe temperature has an influence on the hydrodynamic radius of the particles.
형광상관분광법을 이용한 광세기에 따른 유효 초점 부피 변화에 대한 연구
정찬배,이재란,김석원,Jeong, Chanbae,Lee, Jaeran,Kim, Sok Won 한국광학회 2013 한국광학회지 Vol.24 No.2
Using fluorescence correlation spectroscopy, we analyzed the change of effective focal volume of a confocal system with light intensity. The fluorescence correlation spectroscopy system was home-built in accordance with the He-Ne laser with a wavelength of 632.8 nm, and two kinds of samples (AlexaFluor657 and Quantum dot655) suitable for the wavelength of the laser beam were used. For each sample, we analyzed and compared the correlation functions obtained while changing the intensity of the light source in a range of 1~50 ${\mu}W$. The result shows that the radius of the focal area increases linearly through the increase of particle number and diffusion time in response to an intensity change in weak light below 10 ${\mu}W$. In the higher intensity region (>10~15 ${\mu}W$), the increasing rate of particle number and diffusion time keep increasing but at a much slower rate. Through this result, it was also found that the radius increasing rate of the focal area was reduced however, the radius still increased slightly. 형광상관분광법을 이용하여 광세기에 따른 공초점 시스템의 유효 초점 부피의 변화를 분석하였다. 형광상관분광장치는 632.8 nm 파장의 He-Ne 레이저에 맞춰서 실험실에서 자체 제작하였고, 시료 또한 레이저 파장에 적합한 두 종류의 시료 AlexaFluor647과 quantum dot 655를 사용하였다. 각 시료에 대해 광원의 세기를 1~50 ${\mu}W$ 범위내에서 변화시켜가며 얻어진 상관함수를 비교 분석하였다. 10 ${\mu}W$ 이하의 약한 광 세기에서는 세기 변화에 따라 입자수와 확산시간이 증가하는 것을 통해 초점 영역의 반지름이 선형적으로 증가하는 결과를 보였다. 반면 10~15 ${\mu}W$ 이상에서는 입자의 수와 확산 시간의 증가율은 감소하였지만 미세하게 계속해서 증가하는 결과를 보였고, 이 결과를 통해 초점영역의 반지름 역시 증가율은 감소하였지만 미세하게 증가한 것을 알 수 있었다.
Low-temperature activation under 150°C for amorphous IGZO TFTs using voltage bias
이희수,장기수,탁영준,정태수,박정우,김원기,정주성,정찬배,김현재 한국정보디스플레이학회 2017 Journal of information display Vol.18 No.3
Proposed herein is a new technique of activation for the backplane of low-temperature amorphous indium gallium zinc oxide thin-film transistors (a-IGZO TFTs) by applying a bias voltage to gate, source, and drain electrodes and simultaneously annealing them at 150°C. This ‘voltage bias activation’ can be an effective method of reducing the backplane processing temperature from 300°C to 150°C. Compared with the reference a-IGZO TFTs fabricated at 300°C, the a-IGZO TFTs fabricated through voltage bias activation showed sufficient switching characteristics: 10.39 cm2/Vs field effect mobility, 0.41 V/decade subthreshold swing, and 3.65×107 on/off ratio. These results were analyzed thermodynamically using infrared micro-thermography. In the case of the positive gate voltage bias condition, the maximum temperature of the a-IGZO channel increased to 48°C, and this additional annealing effect and activation energy lowering compensated for the insufficient thermal energy of annealing at a low temperature (150°C). With this approach, a-IGZO TFTs were successfully fabricated at a low temperature.