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The Effect of CdS QDs Structure on the InGaP/GaAs/Ge Triple Junction Solar Cell Efficiency
Chen-Chen Chung,Binh Tinh Tran,Hau-Vei Han,Yen-Teng Ho,Hung-Wei Yu,Kung-Liang Lin,Hong-Quan Nguyen,Peichen Yu,Hao-Chung Kuo,Edward Yi Chang 대한금속·재료학회 2014 ELECTRONIC MATERIALS LETTERS Vol.10 No.2
This work describes optical and electrical characteristics of InGaP/GaAs/Ge triple-junction (T-J) solar cells with CdS quantum dots (QDs) fabricated by a novel chemical solution. With the anti-reflective feature at long wavelength and down-conversion at UV regime, the CdS quantum dot effectively enhance the overall power conversion efficiency more than that of a traditional GaAs-based device. Experimental results indicate that CdS quantum dot can enhance the short-circuit current by 0.33 mA/cm2, which is observed for the triple-junction solar cells with CdS QDs of about 3.5 nm in diameter. Moreover, the solar cell conversion efficiency is improved from 28.3% to 29.0% under one-sun AM 1.5 global illumination I-V measurement.
Effect of the Circle-Grid Electrodes on Concentrated GaAs Solar Cell Efficiency
Chen-Chen Chung,Binh Tinh Tran,Ming-Hung Han,Kung-Liang Lin,Hung-Wei Yu,Yen-Teng Ho,Chun-Yen Chang,Edward Yi Chang 대한금속·재료학회 2014 ELECTRONIC MATERIALS LETTERS Vol.10 No.5
In this study, we investigate the effect of the shading factor of the front grid pattern on concentrated solar cell efficiency, taking the trade-off between the series resistance of the electrodes and the amount of incident light into consideration. We examine the thermal effect with regard to five different circle-grid electrode patterns of the front contact. The front contacts with different grid patterns affect the characteristics of light-concentratedtype GaAs single-junction solar cells. The device parameters analyzed include the open-circuit voltage (Voc), short-circuit current (Isc), fill factor (FF) and conversion efficiency (η). The results of our study show that for a concentration ratio greater than 60x with AM1.5G, the device with a shading factor of 7.1% has the best cell efficiency of 27.05%, due to the smaller current crowding at the center spot. The results indicate that the conversion efficiency of solar cells can be improved by establishing a compromise between the shading effect and the series resistance effect.
Maternal transmission effects of the PAX genes among cleft case–parent trios from four populations
Sull, Jae Woong,Liang, Kung-Yee,Hetmanski, Jacqueline B,Fallin, Margaret Daniele,Ingersoll, Roxanne G,Park, Jiwan,Wu-Chou, Yah-Huei,Chen, Philip K,Chong, Samuel S,Cheah, Felicia,Yeow, Vincent,Park, Be Macmillan Publishers Limited 2009 European journal of human genetics Vol.17 No.6
Isolated cleft lip with or without cleft palate (CL/P) is among the most common human birth defects, with a prevalence of 1 in 700 live births. The paired box (PAX) genes have been suggested as candidate genes for CL/P based largely on mouse models; however, few human studies have focused on this gene family. This study tests for association between markers in four PAX genes and CL/P using a case-parent trio design considering parent-of-origin effects. Trios from four populations (76 from Maryland, 146 from Taiwan, 35 from Singapore, and 40 from Korea) were genotyped for 34 single nucleotide polymorphisms (SNPs) in the PAX3, PAX6, PAX7, and PAX9 genes. We performed the transmission disequilibrium test (TDT) on individual SNPs. Parent-of-origin effects were assessed using the transmission asymmetry test (TAT) and the parent-of-origin likelihood ratio test (PO-LRT). TDT analysis showed one SNP (rs766325) in PAX7 yielding evidence of linkage and association when parent-of-origin was not considered, with an OR(transmission)=1.62 (P=0.003), and five SNPs in PAX6 (including two pairs in near perfect linkage disequilibrium). TAT analysis of all trios revealed two SNPs in PAX7 and four SNPs in PAX3 showing significant excess maternal transmission. For these six SNPs, the maternal OR(transmission) ranged between 1.74 and 2.40, and PO-LRT was also significant (P-values=0.035–0.012). When this analysis was limited to trios with male cases, SNPs in PAX7 showed higher maternal OR(transmission) and greater significance. PAX genes may influence the risk of CL/P through maternal effects, possibly imprinting, which seems to be stronger among male cases.European Journal of Human Genetics (2009) 17, 831–839; doi:10.1038/ejhg.2008.250; published online 14 January 2009
Effect of Multiple AlN Layers on Quality of GaN Films Grown on Si Substrates
Binh Tinh Tran,Kung-Liang Lin,Kartika Chandra Sahoo,Chen-Chen Chung,Chi-Lang Nguyen,Edward Yi Chang 대한금속·재료학회 2014 ELECTRONIC MATERIALS LETTERS Vol.10 No.6
In this paper, we present the effect of multiple thin high-low-high-temperature AlN (HLHT AlN) nucleation layers on GaN film quality. A 1.9-μm-thick GaN film grown on Si (111) substrate shows that the multiple HLHT AlN nucleation layers have a significant effect on GaN film quality. This process also plays a very important role in the growth of GaN films on Si (111) substrates. A high quality GaN film with a uniformly faceted surface with very low dislocation densities is obtained at the optimized multiple HLHT AlN nucleation layers 50-nm thick at a temperature of 1010-800-1010°C and a growth pressure of 50 Torr.
Developing Geriatric Services in Taiwan
Ming-Hsien Lin,Li-Ning Peng,Liang-Kung Chen 대한노인병학회 2012 Annals of geriatric medicine and research Vol.16 No.1
Taiwan is aging fast, and so are neighborhood countries in eastern Asia. The rapid demographic transition triggers the need of developing elder-friendly health care system. However, developing geriatric services in eastern Asia was not as successful as western countries due to various reasons. In Taiwan, the development of geriatric services has been highly supported by the Veteran Affairs Commission in the past few years. Outpatient and inpatient geriatric services, as well as the post-acute care services have been successfully developed. The success of developing geriatric services in Taiwan was related to the development of geriatric specialty training program, which provided well-trained geriatricians for institutes to start new services. The success of specialty training programs also extended into clinical geriatric researches, especially the health service researches that proved the clinical benefits of outpatient, inpatient, post-acute and long-term care services with active participation of geriatricians. This review summarized the development of geriatric services and clinical geriatric researches in Taiwan in recent years.
Post-Acute Care as a Key Component in a Healthcare System for Older Adults
Yu-Chun Wang,Ming-Yueh Chou,Chih-Kuang Liang,Li-Ning Peng,Liang-Kung Chen,Ching-Hui Loh 대한노인병학회 2019 Annals of geriatric medicine and research Vol.23 No.2
Older adults often experience functional decline following acute medical care. This func-tional decline may lead to permanent disability, which will increase the burden on the medical and long-term care systems, families, and society as a whole. Post-acute care aims to promote the functional recovery of older adults, prevent unnecessary hospital readmission, and avoid premature admission to a long-term care facility. Research has shown that post-acute care is a cost-effective service model, with both the hospital-at-home and community hospital post-acute care models being highly effective. This paper describes the post-acute care models of the United States and the United Kingdom and uses the example of Taiwan’s highly effective post-acute care system to explain the bene-fits and importance of post-acute care. In the face of rapid demographic aging and smaller household size, a post-acute care system can lower medical costs and improve the health of older adults after hospitalization.