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Growth of Amorphous InGaN Films on Si for Potential Photovoltaic Application
Wang Ting,Mo Guankong,Zhao Hongli,Yao Juan,Zou Zhuoliang,Fu Yuechun,Shen Xiaoming,He Huan 대한전기학회 2022 Journal of Electrical Engineering & Technology Vol.17 No.2
Amorphous InGaN fi lms were deposited on p-Si(100) substrates using a self-refi ted pulsed laser deposition system with double laser light paths and two-component target. The eff ects of laser energy on the microstructure, electrical and photovoltaic performances of InGaN fi lms as well as n-InGaN/p-Si heterojunction solar cells were investigated. The results show that all the fi lms are rich in Ga and poor in In, and the (In + Ga)/N atomic ratios are greater than 1. As the laser energy increases, In composition increases gradually and reaches to a maximum of 4.6 at.%. The PL spectra indicates that the band gap of the fi lms decrease with the increase of laser energy. Meanwhile, the resistivity of InGaN fi lm is decreased in two orders of magnitude due to the increasing of carrier concentration. Under the illumination of AM 1.5G solar simulator, the maximum power conversion effi ciency of amorphous n-InGaN/p-Si heterojunction solar cells is 0.73% with an open circuit voltage of 2.41 V and short current density of 0.69 mA/cm 2 at the laser energy of 175 mJ/pulse
Jie Tan,Mahadi Masud,Xiaoming Qin,Cheng Yuan,Qingzhao Kong,Y.L.Mo 국제구조공학회 2021 Smart Structures and Systems, An International Jou Vol.28 No.5
Pier column, as the most critical load-bearing member of bridge, can bear multiple loads including axial forces,shear forces, bending moments, etc. The varied cross section at the column interface and bearing platform or drilled shaft leads to harmful stress concentration that can potentially compromise the structural integrity. In order to improve the ductility of bridge structure, a pier column is often designed with a variable cross-section region to dissipate energy through plastic deformation. For better understanding the health condition of pier column in its service life, it is of great significance to obtain the damage severity information in the variable cross-section region. This study utilizes an active sensing method enabled by distributed Lead Zirconate Titanate (PZT)-based Smart Aggregate (SA) sensors to monitor the damage initiation and development near the bottom of a pier column. Crack damage in variable cross-section region functions as a stress relief that attenuates propagating stress wave energy between SA pairs. Both the numerical and experimental results show that the reduction ratio of the stress wave energy is consistent with the crack development, thus validating the reliability of the investigated approach. SA-based technology can be used as a potential tool to provide early warning of damage in variable cross-section region of bridge structures.
Guojia Fang,Haoning Wang,Hao Long,Zhao Chen,Xiaoming Mo,Songzhan Li,Zhiyou Zhong 대한금속·재료학회 2015 ELECTRONIC MATERIALS LETTERS Vol.11 No.4
Alternating-current-driven ZnO-based light-emitting diodes (LEDs) with an Au/ZnMgO/ZnO/ZnMgO/GaN/In structure have been fabricated. Both polarity-controlled electroluminescence (EL) and ultraviolet emission were achieved when driven by an alternating current (AC) under a much lower root-mean-square voltage than that of conventional inorganic AC thin-film electroluminescent devices. This ZnO-based LED can be regarded as a series incorporating a metal-insulator-semiconductor diode and a p-i-n diode. The EL mechanisms were discussed in terms of the band diagrams and carrier transport behavior with reference to the semiconductor heterojunction theory.
Jo Jung Su,Kim Dong Sub,Jo Won Jun,Sim Ha Seon,Lee Hye Jin,Moon Yu Hyun,Woo Ui Jeong,Jung Soo Bin,Kim Steven B.,Mo Xiaoming,Ahn Su Ran,Kim Sung Kyeom 한국원예학회 2022 Horticulture, Environment, and Biotechnology Vol.63 No.4
The strawberry growth and fruit yield of five Korean cultivars in the tunnel-type greenhouse predicted using their growth. The number of leaves, petiole length, leaf length and width, crown diameter, and the ratio of red and far-red (RFR) of the five Korean cultivars were measured during the cultivation period. The number of leaves of all cultivars exhibited a similar trend during this period; the plant and petiole length of ‘Maehyang’ were the longest, leaf length exhibited similar trends in all five cultivars except for ‘Jukhyang’, the leaf width of ‘Arihyang’, was the longest, and crown diameter of ‘Keumsil’ was the thickest. The leaf length, crown diameter, and RFR were associated with the fruit yield in the multiple linear regression. When a single model was used to predict the yield of all five cultivars, the correlation between expected yield and actual yield was r = 0.53. When cultivar-specific models were built for the prediction, the correlation increased to r = 0.77. The results indicated that the fruit yield of strawberry cultivars could be better predicted by considering cultivar-specific information, so it may be necessary to consider individual cultivars specifically rather than all cultivars simultaneously.