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전폴리머 조성에 따른 고분자 분산형 액정의 전기 광학 특성 평가
양기정,윤도영,Yang, Kee-Jeong,Yoon, Do-Young 한국전기전자재료학회 2010 전기전자재료학회논문지 Vol.23 No.11
Polymer dispersed liquid crystal (PDLC) films were prepared by the phase separation method using the liquid crystal (E7) and prepolymers. This work investigated the electro-optical characteristics of various PDLC films. In order to have good contrast ratio, the polymer refractive index must be adjusted to the ordinary refractive index of the liquid crystal. The driving voltage of PDLC films were mainly affected by elastic deformation. E7-Ebecryl810-IOA-TMPTA-HMPPO system had good threshold voltage and driving voltage and E7-Ebecryl810-EHA-PEGDA-HMPPO system had good contrast ratio.
양기정 ( Kee Jeong Yang ),윤도영 ( Do Young Yoon ) 한국화학공학회 2010 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.48 No.6
High leakage current and threshold voltage shift (△Vth) are demerits of a-Si:H TFT. These characteristics are influenced by gate insulator and active layer film quality, surface roughness, and process conditions. The purpose of this investigation is to improve off current (Ioff) and △Vth characteristics. Nitrogen-rich deposition condition was applied to gate insulator, and hydrogen-rich deposition condition was applied to active layer to reduce electron trap site and improve film density. Ioff improved from 1.01 pA to 0.18 pA at 65˚C, and △Vth improved from -1.89 V to 1.22 V.
Zn(O<sub>x</sub>,S<sub>1-x</sub>) 버퍼층 적용을 통한 Cu<sub>2</sub>ZnSnS<sub>4</sub> 태양전지 특성 향상
양기정 ( Kee-jeong Yang ),심준형 ( Jun-hyoung Sim ),손대호 ( Dae-ho Son ),이상주 ( Sang-ju Lee ),김영일 ( Young-ill Kim ),윤도영 ( Do-young Yoon ) 한국화학공학회 2017 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.55 No.1
This experiment investigated characteristic changes in a Cu<sub>2</sub>ZnSnS<sub>4</sub>(CZTS) solar cell by applying a Zn (O<sub>x</sub>,S<sub>1-x</sub>) butter layer with various compositions on the upper side of the absorber layer. Among the four single layers such as Zn(O<sub>0.76</sub>,S<sub>0.24</sub>), Zn(O<sub>0.56</sub>, S<sub>0.44</sub>), Zn(O<sub>0.33</sub>,S<sub>0.67</sub>), and Zn(O<sub>0.17</sub>,S<sub>0.83</sub>), the Zn(O<sub>0.76</sub>,S<sub>0.24</sub>) buffer layer was applied to the device due to its bandgap structure for suppressing electron-hole recombination. In the application of the Zn(O<sub>0.76</sub>,S<sub>0.24</sub>) buffer layer to the device, the buffer layer in the device showed the composition of Zn(O<sub>0.7</sub>,S<sub>0.3</sub>) because S diffused into the buffer layer from the absorber layer. The Zn(O<sub>0.7</sub>,S<sub>0.3</sub>) buffer layer, having a lower energy level (E<sub>V</sub>) than a CdS buffer layer, improved the J<sub>SC</sub> and V<sub>OC</sub> characteristics of the CZTS solar cell because the Zn(O<sub>0.7</sub>,S<sub>0.3</sub>) buffer layer effectively suppressed electron-hole recombination. A substitution of the CdS buffer layer by the Zn(O<sub>0.7</sub>,S<sub>0.3</sub>) buf-fer layer improved the efficiency of the CZTS solar cell from 2.75% to 4.86%.
강진규 ( Jin-kyu Kang ),손대호 ( Dae-ho Son ),심준형 ( Jun-hyoung Sim ),황대규 ( Dae-kue Hwang ),성시준 ( Shi-joon Sung ),양기정 ( Kee-jeong Yang ),김대환 ( Dae-hwan Kim ) 한국공업화학회 2017 공업화학전망 Vol.20 No.2
태양전지는 온실 가스 감축에 효과가 큰 기후 변화 대응 기술이다. 현재 상업화에 성공한 실리콘 태양전지의 뒤를 이어 박막 태양전지, 페로브스카이트 태양전지 등 차세대 태양전지가 가격과 효율 등을 극복하기 위하여 매우 많이 연구되고 있다. CZT(S,Se) 박막 태양전지는 차세대 태양전지의 유력 후보군인 CIGS, CdTe, 페로브스카이트 태양전지 등에 비해 범용 무독성 원소를 광흡수층으로 사용한다는 장점을 가지고 있지만 아직까지는 이들보다 효율이 낮아 상용화하기에는 많은 문제를 가지고 있다. CZT(S,Se) 박막태양전지의 기본적인 물성, 공정 등을 알아보고 고효율을 달성하는 방법에 대하여 알아보고자 한다.