Abstract
Abstract In order to overcome the decreased power conversion efficiency of semi-transparent organic solar cells, methods to prepare a simple external reflection layer were studied. A reflective layer was formed by blending a polymer with high refractive index materials and was fabricated on top of the device to enhance the power conversion efficiency of the semi-transparent device. When silver coated exfoliated montmorillonite, aluminum oxide nano-particles, or magnesium oxide nano-particles were used as a reflective layer material, the enhancement in power conversion efficiency was imperceptible. A reflective layer formed by blending polymer and gold nanoparticles was tried to enhance the power conversion efficiency based on the plasmonic effect of gold. Two different sizes (2 nm and 30 nm in diameter) of gold nanoparticles were used as reflective layers to fabricate OPV devices and both devices showed an approximately 20% power conversion efficiency increase compared to the reference semi-transparent device. Better enhancement of power conversion efficiency was obtained by combining the gold plasmonic effect and the scattering effect from a reflective layer formed with a 1:1 mixture of 2 nm and 30 nm gold nanoparticles. Devices with the gold nanoparticle mixture layer as a reflective layer showed about 50% improvement in power conversion efficiency compared to the reference device. The process for preparing this polymer reflective layer is very simple and inexpensive to manufacture.
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