Increasing energy consumption has led to a growing interest in organic semiconductors (OSC), especially in the field of organic photovoltaics (OPV) converting light into electric current. Due to many advantages over their inorganic counterparts, such as the flexibility of organic materials, high availability, and low-cost production, to name a few, organic systems hold great promise for future everyday applications. Although the class of potential applications and advantages of OSCs are numerous, a complete understanding and optimization of the electronic properties of OSCs is challenging due to their complexity compared to inorganic solids.