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Wang H.,Tianjin University | Wang H.,Key Laboratory of Optoelectronic Information Science and Technology | Zhang Y.,Tianjin University | Zhang Y.,Key Laboratory of Optoelectronic Information Science and Technology | And 6 more authors.
Zhongguo Jiguang/Chinese Journal of Lasers | Year: 2015

Amplified spontaneous emission (ASE) sources based on erbium-doped fibers are widely applied in many fields, such as fiber sensing, communication and precision measurement. It plays a negative role of light noise after a process of long-term continuous operation to precision and sensitivity of the following detection and measurement systems. However, it has been reported rarely. Here, via accelerated aging experiment at 343 K, the light noise of optical section of ASE is studied. During the process, optical noise is detected in-situ. According to Arrhenius model, in the early stage of 3200 h at room temperature, the optical noise decreases about 0.0743 μV2Hz-1 then slowly increases about 0.0338 μV2Hz-1 in latter stage of 44416 h. Before and after acceleration aging, optical noise is a quadratic function of optical power. By fitting, it is obtained the second order item coefficient α, or termed as to coefficient of relative intensity noise, and the first order item coefficient β, or termed as to coefficient of shot noise. Through the aging, both of them increase, where α and β increase 0.010 μV2μW2Hz-1 and 0.054 μV2μW-1Hz-1, inceptively. Moreover, the spectral shape of ASE is irrecoverably shifted after accelerated aging. ©, 2015, Science Press. All right reserved.


Jin L.,Tianjin University | Jin L.,Key Laboratory of Optoelectronic Information Science and Technology | Zhang Y.,Tianjin University | Zhang Y.,Key Laboratory of Optoelectronic Information Science and Technology | And 8 more authors.
Zhongguo Jiguang/Chinese Journal of Lasers | Year: 2014

The InGaAs PIN photoelectric detector has great value in fields of spatial remote sensing and satellite communication. Evolvement rules of the output electrical signal noise are studied with the experiment of accelerated aging at constant temperature 358 K when the detector operates stably in a long term. And on this basis, failure analysis of the detector working in long-term is discussed by comparison with the fore-and-aft linear region and temperature property of its noise. The theoretical results indicate that after operating stably in about 10.8 years, thermal noise of the detector's background noise will increase about 20%, and dark current noise about 0.35%. For the linear region of two detectors 13.31% and 9.95% are declined. Furthermore, the output noise model is modificated according to the analysis and the results of the experiments.


Huang Q.,Nankai University | Huang Q.,Key Laboratory of Photo Electronics Thin Film Devices and Technique of Tianjin | Huang Q.,Key Laboratory of Optoelectronic Information Science and Technology | Zhang D.,Nankai University | And 17 more authors.
Solar Energy Materials and Solar Cells | Year: 2015

Advanced light management currently plays an important role in high-performance solar cells. In this paper, a HAZO/AZO structure that was produced using RF-magnetron sputtering with segmented hydrogen mediation was proposed to further simultaneously enhance the transmittance and light trapping capability at full solar spectrum. Compared to the standard AZO front contact, the total transmittance at short wavelength and haze at full spectrum were remarkably enhanced by 5.1% and 20.7%, respectively. Additionally, the resistivity of the HAZO/AZO structure was enhanced by 16.9%. When applied as front electrodes, the spectral response of a-Si:H and μc-Si:H solar cells increased. The quantum efficiency of the a-Si:H solar cell improved by 7.9% (from 59% to 66.9%) at 400 nm. An initial efficiency of 8.69% with Jsc over 27 mA/cm2 was obtained for the μc-Si:H solar cell. Finally, an a-Si:H/a-SiGe:H/μc-Si:H triple-junction solar cell was obtained with the initial efficiency over 15%, which illustrates a promising and potentially cost-effective alternative structure to further improve the high-quality transparent electrodes for high-efficiency thin-film solar cells. © 2014 Elsevier B.V. All rights reserved.


Cao Y.,Nankai University | Cao Y.,Key Laboratory of Optoelectronic Information Science and Technology | Zhang J.,Nankai University | Zhang J.,Key Laboratory of Optoelectronic Information Science and Technology | And 14 more authors.
Solar Energy Materials and Solar Cells | Year: 2013

Hydrogenated microcrystalline silicon germanium (μc-Si 1-xGex:H), with the advantage of its narrower variable band gap and higher absorption coefficient over the conventional hydrogenated microcrystalline silicon (μc-Si:H), has been implemented as the bottom sub-cell absorber of the triple junction solar cells. By replacing μc-Si:H i-layer with μc-Si0.91Ge0.09:H i-layer in the triple junction solar cell, the bottom sub-cell thickness (Dbottom) could be reduced by almost a half, meanwhile a higher efficiency was attained. As a result, an initial efficiency of 12.02% in an a-Si:H/a-Si0.6Ge 0.4:H/μc-Si0.91Ge0.09:H triple junction structure with a total cell thickness as small as 1800 nm was achieved. It is demonstrated that the triple junction solar cell incorporating μc-Si 1-xGex:H bottom sub-cell with high efficiency and a relatively low thickness has a high potential for cost-effective photovoltaic applications. © 2013 Elsevier B.V. All rights reserved.

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