tailieunhanh - Báo cáo hóa học: "Solid-state dye-sensitized solar cells based on ZnO nanoparticle and nanorod array hybrid photoanodes"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Solid-state dye-sensitized solar cells based on ZnO nanoparticle and nanorod array hybrid photoanodes | Lee et al. Nanoscale Research Letters 2011 6 517 http content 6 1 517 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Solid-state dye-sensitized solar cells based on ZnO nanoparticle and nanorod array hybrid photoanodes Tao-Hua Lee1 Hung-Jue Sue2 3 and Xing Cheng1 2 Abstract The effect of ZnO photoanode morphology on the performance of solid-state dye-sensitized solar cells DSSCs is reported. Four different structures of dye-loaded ZnO layers have been fabricated in conjunction with poly 3-hexylthiophene . A significant improvement in device efficiency with ZnO nanorod arrays as photoanodes has been achieved by filling the interstitial voids of the nanorod arrays with ZnO nanoparticles. The overall power conversion efficiency increases from for a nanorod-only device to for a device with combined nanoparticles and nanorod arrays. The higher device efficiency in solid-state DSSCs with hybrid nanorod nanoparticle photoanodes is originated from both large surface area provided by nanoparticles for dye adsorption and efficient charge transport provided by the nanorod arrays to reduce the recombinations of photogenerated carriers. Keywords organic photovoltaic ZnO nanoparticle nanorod Background The rapidly increasing fossil fuel consumption and excessive greenhouse gas emissions have put significant pressure on the already exhaustive global energy demand and needs for environmental protection. The global growing demand for energy and for protecting our environment can potentially be met by solar cell technology. Although the solar cells technology has not yet been in large-scale utilization because of its high cost and insufficient conversion efficiencies in the past recent advances in nanomaterial and device technologies have offered new opportunities for it to become competitive to fossil fuels. Among the diverse photovoltaic devices the dye-sensitized solar cells DSSCs technology has made enormous .