Modern society relies heavily on cheep fossil fuels, a situation that is causing environmental problems such as global warming. Therefore, renewable energy is becoming increasingly important to our society. Among the various forms of renewable energy, solar energy has particular advantages since solar energy is an abundant, limitless energy resource. One of the most crucial challenges in the promotion of solar power generation systems is, however, the reduction of power generation costs. Organic solar cells or organic/inorganic solar cells make promising candidates for low cost and environmentally-friendly solar cells.
To achieve this target, we have been exploring novel materials, and extensively researching solar cells based on new concepts, by employing time-resolved spectroscopy as a tool to probe key processes such as light harvesting and charge transport.