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Enhanced Solar Cell Conversion Efficiency Using Birefringent Liquid Crystal Polymer Homeotropic Films from Reactive Mesogens
Institute of Electro-Optical Engineering, Chang Gung University, Kweisan, Taoyuan 333, Taiwan
* Author to whom correspondence should be addressed.
Received: 12 September 2013; in revised form: 12 October 2013 / Accepted: 17 October 2013 / Published: 25 October 2013
Abstract: Novel birefringent liquid crystal polymer homeotropic films have been coated on semiconductor solar cells to improve the effective incident sunlight angles. The liquid crystal polymer precursor, based on reactive mesogens, is fluidic and flows like liquid. It would distribute uniformly on the solar cell sample surface by any traditional coating technique. The birefringence for light, due to the liquid crystal retardation properties, manipulated the optical length and the deflection of incident light, thus allowed an increase in the energy conversion efficiency. The expensive sunlight tracking systems could be avoided. The processing parameters can be tuned such as different mesogen concentrations and plate speeds of spin-coating. The results showed that the solar cell conversion efficiency was improved from 14.56% to 14.85% at an incident sunlight angle of 15°. It was further improved from 13.40% to 13.81% when the angle was 30°. The interesting angular dependency on solar cell efficiency enhancement has been evaluated.
Keywords: liquid crystal polymer; energy conversion efficiency; reflectivity
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MDPI and ACS Style
Wu, G.; Hsieh, L.-H.; Chien, H.-W. Enhanced Solar Cell Conversion Efficiency Using Birefringent Liquid Crystal Polymer Homeotropic Films from Reactive Mesogens. Int. J. Mol. Sci. 2013, 14, 21319-21327.
Wu G, Hsieh L-H, Chien H-W. Enhanced Solar Cell Conversion Efficiency Using Birefringent Liquid Crystal Polymer Homeotropic Films from Reactive Mesogens. International Journal of Molecular Sciences. 2013; 14(11):21319-21327.
Wu, Gwomei; Hsieh, Li-Hang; Chien, How-Wen. 2013. "Enhanced Solar Cell Conversion Efficiency Using Birefringent Liquid Crystal Polymer Homeotropic Films from Reactive Mesogens." Int. J. Mol. Sci. 14, no. 11: 21319-21327.