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Solar energy conversion devices composed of highly crystalline gel polymers with disk-WO 3 nanostructure and plate-WO 3 microstructures (D-WO 3 and P-WO 3 , respectively) exhibited higher power conversion efficiency than those with a gel electrolyte. In this study, D-WO 3 and P-WO 3 were prepared using a hydrothermal process and their structural and morphological features were investigated for application in solar energy conversion devices. The P-WO 3 solid-state electrolyte significantly enhanced the cell performance owing to its charge transportation and light-scattering characteristics. The P-WO 3 solid-state electrolyte showed a power conversion efficiency of 6.3%, which is higher than those of the gel (4.2%) and D-WO 3 solid-state (5.5%) electrolytes. The electro-chemical impedance spectroscopy (EIS), intensity-modulated voltage spectroscopy (IMVS), diffuse reflectance, and incident photon-to-current conversion efficiency (IPCE) analysis results showed that the P-WO 3 solid-state electrolyte showed improved charge transportation and light scattering, and hence enhanced the cell performance.

Solid-State Solar Energy Conversion from WO3 Nano and Microstructures with Charge Transportation and Light-Scattering Characteristics