The emerging dye-sensitized solar cells, perovskite solar cells, and organic solar cells have been regarded as promising photovoltaic technologies. The device structures and components of these solar cells are imperative to the device’s efficiency and stability. Polymers can be used to adjust the device components and structures of these solar cells purposefully, due to their diversified properties. In dye-sensitized solar cells, polymers can be used as flexible substrates, pore- and film-forming agents of photoanode films, platinum-free counter electrodes, and the frameworks of quasi-solid-state electrolytes. In perovskite solar cells, polymers can be used as the additives to adjust the nucleation and crystallization processes in perovskite films. The polymers can also be used as hole transfer materials, electron transfer materials, and interface layer to enhance the carrier separation efficiency and reduce the recombination. In organic solar cells, polymers are often used as donor layers, buffer layers, and other polymer-based micro/nanostructures in binary or ternary devices to influence device performances. The current achievements about the applications of polymers in solar cells are reviewed and analyzed. In addition, the benefits of polymers for solar cells, the challenges for practical application, and possible solutions are also assessed.

The electrospun TiO ₂ nanofibers can provide direct pathways for the rapid collection and transmission of photogenerated electrons. These can also be conducive to the absorption and utilization of sunlight.

A high performance Perovskite-sensitized nanoporous TiO ₂ photoanode is prepared for the first time by an in situ technique for use in perovskite solar cells; potentially improving their efficency.

The light-weight perovskite solar cell is prepared by employing TiO ₂ nanowire (TNW) arrays on the Ti foil substrate as the electron collection layer and using a highly transparent PEDOT on the ITO/PEN substrate as the hole transporting layer.