An Anthradithiophene derivative having general formula (I): can be advantageously used in the synthesis of electron donor polymers These polymers can be advantageously used in the construction of photovoltaic devices (or solar devices) such as, for example, photovoltaic cells (or solar cells), photovoltaic modules (or solar modules), either on a rigid support or on a flexible support. Furthermore, these polymers can be advantageously used in the construction of Organic Thin Film Transistors (OTFTs), or Organic Field Effect Transistors (OFETs), or Organic Light-Emitting Diodes (OLEDs).