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For CdS/CdTe solar cells with conventional Cu doped CdTe at the back contact, the diffusion of copper into CdS window layer is detrimental to the solar cell performance. In order to obviate this problem, single wall carbon nanotube thin films with enriched semiconducting ratio (95% S-SWNT) are applied to the CdS/CdTe device and their suitability as back contact materials are studied. We achieve solar...
The thermal regeneration of fiber Bragg gratings inscribed on hydrogenated gallosilicate optical fiber, fabricated using a modified chemical vapor deposition (MCVD) technique followed by a solution doping process, is demonstrated for the first time. A type-I seed grating is thermally regenerated and the evolution of the grating reflectivity in a temperature range between 25 °C and 720 °C is investigated...
In this paper, we have demonstrated birefringence modification in regenerated grating in polarization maintaining fiber (RGPMF) by using a CO 2 laser annealing technique. After conducting an isothermal annealing procedure followed by a slow cooling process, the birefringence of the RGPMF has been increased. This phenomenon can be explained by the changes in the thermal expansion coefficient and glass...
We reported a fast and controllable two step deposition method for fabricating perovskite solar cells. Homogeneous perovskite CH3NH3PbI3 thin film layers were deposited by thermal evaporation of PbI2 and ultrasonic spray coating of CH3NH3I. The use of ultrasonic spray coating technique ensured a better control of the perovskite morphology, and a complete reaction for forming the CH3NH3PbI3 layer in...
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