China Academy of Research of MIIT

Beijing, China

China Academy of Research of MIIT

Beijing, China
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Wang G.H.,CAS Institute of Electrical Engineering | Shi C.Y.,China Academy of Research of MIIT | Zhao L.,CAS Institute of Electrical Engineering | Yan B.J.,CAS Institute of Electrical Engineering | And 5 more authors.
Thin Solid Films | Year: 2013

Different aluminum-doped ZnO (AZO)/metal composite films, including AZO/Al, AZO/Ag/Al and AZO/Ag/NiCr/Al, were utilized as the back reflectors for p-i-n hydrogenated amorphous silicon germanium (a-SiGe:H) thin film solar cells. It was found that AZO/Al had a better performance than single Al electrode and the thickness of AZO film could strongly affect the short-circuit current density (Jsc) of the solar cells. However, AZO/Ag/Al, which was expected to improve the back reflectance further, gave out a bad effect, due to the inter diffusion of Ag and Al. While a nickel-chromium (NiCr) film was inserted between Ag and Al as a diffusion barrier, the highest Jsc was achieved. So AZO/Ag/NiCr/Al could be utilized as an improved AZO/metal back reflector for p-i-n a-SiGe:H solar cells.


Wang G.,CAS Institute of Electrical Engineering | Shi C.,China Academy of Research of MIIT | Hu R.,CAS Institute of Electrical Engineering | Zhao L.,CAS Institute of Electrical Engineering | And 2 more authors.
RSC Advances | Year: 2015

An optical emission spectroscopic study identifies transient and steady-state behavior of the excited H∗α/H∗β/SiH∗/GeH∗ emission in parallel plate SiH4/GeH4/H2 plasma. The effect of deposition parameters on the radical density in plasma is determined. To clarify the radical production mechanism further, the optoelectronic properties of the hydrogenated amorphous silicon-germanium thin films deposited at different hydrogen flow rates in 3 Torr pressure are investigated. The results show a low hydrogen flow rate improves the optoelectronic properties of the thin films whereas a high flow rate leads to a much higher defect density in the thin films. The ratio of GeH∗ to SiH∗ emission intensity is related to the germanium content in the plasma. The germanium content is changed for the different hydrogen flow rates, thereby adjusting the optical bandgap, with 1.32 ± 0.20 eV at a high 200 sccm hydrogen flow rate. This journal is © 2015 The Royal Society of Chemistry.


Wang G.H.,CAS Institute of Electrical Engineering | Shi C.Y.,China Academy of Research of MIIT | Zhao L.,CAS Institute of Electrical Engineering | Hu R.D.,CAS Institute of Electrical Engineering | And 5 more authors.
Thin Solid Films | Year: 2014

The performances of p-i-n amorphous silicon germanium (a-SiGe:H) solar cell modules were investigated post annealing at different temperatures. When the annealing temperature is 190 C, the best performance of solar cell modules is obtained. The efficiency of solar cell modules is improved from 5.11% to 7.91%. The enhancement in quantum efficiency spectra at long wavelength post annealing may be attributable to there being significantly less absorption in intrinsic layer. The microstructural properties of the a-SiGe:H thin films are investigated post annealing at different temperatures. The results show that the low temperature annealing process leads to the improvement in the film microstructure.


Wang G.H.,CAS Institute of Electrical Engineering | Shi C.Y.,China Academy of Research of MIIT | Zhao L.,CAS Institute of Electrical Engineering | Diao H.W.,CAS Institute of Electrical Engineering | Wang W.J.,CAS Institute of Electrical Engineering
Vacuum | Year: 2014

The flexible polymer solar modules are fabricated by glass substrate transfer technology. The deposition system of silicon thin film solar cell deposited directly on glass substrate is used to prepare flexible ones. In addition, the process of module cascade is compatible with one on the glass substrate. A conversion efficiency up to 5.38% of 100 cm2 flexible amorphous silicon thin film solar modules using a glass as temporary substrate during processing and a polymer as permanent substrate in the finished module was achieved. The flexible polymer solar modules have a good light stability. © 2013 Published by Elsevier Ltd. All rights reserved.

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