UV micro-imprint patterning for tunable light trapping in p-i-n thin-film silicon solar cells
APPLIED SURFACE SCIENCE
Authors: Wang, Yanfeng; Zhang, Xiaodan; Han, Bing; Bai, Lisha; Zhao, Huixu; Yang, Fu; Liang, Junhui; Huang, Qian; Chen, Xinliang; Zhao, Ying
Abstract
In this paper, we used UV micro-imprint lithography periodic patterning combined with self-textured BZO films with a wide range of texture distributions for light trapping in thin-film silicon solar cells. It was found that the feature size of the periodic textures has a significant influence on the light trapping capacity of the glass substrate and the external quantum efficiency (EQE) of microcrystalline silicon (mu c-Si:H) solar cells. Microcrystalline silicon solar cells, deposited on periodic textures of 5 pm, showed an improved photocurrent density without any loss in the open-circuit voltage and fill factor; hence, resulting in an overall efficiency increase of 6.28%. (C) 2015 Elsevier B.V. All rights reserved.
Structural and Superconducting Properties of Undoped and BZO-doped GdBCO Thin Films
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
Authors: Schlesier, Kim; Huhtinen, Hannu; Paturi, Petriina; Stepanov, Yuri Paulus; Laiho, Reino
Abstract
We report the effect of 4 wt% BZO-doping in GdBCO thin films on (100) STO substrates with novel nanograined target materials deposited by pulsed laser deposition (PLD) method. X-ray diffraction, atomic force microscopy and magnetization measurements, which were made in particularly wide temperature and magnetic field range, were used to determine the structural and superconducting properties. The results were compared with ones of YBCO. The deposition temperature, T(s), is not very critical for GdBCO and it is found to be much lower in undoped and BZO-doped GdBCO than in YBCO. The BZO-doping of GdBCO enhanced the field dependence of critical current density, j(c), at low temperatures. Furthermore, BZO-doping enhances the accommodation field, B*, below 60 K being clearly higher at 10 K in doped GdBCO than in YBCO. The pinning mechanism in GdBCO was concluded to be similar to that of YBCO. Our results clearly show that undoped and BZO-doped nanophase GdBCO is a very promising target material for applications as well as for coated conductors.