Nanotechnology has proven to be a promising route for harvesting solar energy, and recent research is focused on the development and use of novel nanomaterials in solar photovoltaics (PVs). The exponential technological advancement has resulted in an ever-increasing demand for flexible, lightweight, and durable electronic gadgets and, thus, the need for state-of-the-art solar devices. Flexible solar cells (FSCs) have been hailed as a potential PV technology due to inherent benefits such as flexibility, lightness, and enhanced optoelectronic performance, making them ideal for installation, transportation, and integration with portable and wearable electronic devices. Recent evolutions of FSCs are discussed and analyzed in this chapter, focusing on the main components such as the flexible substrates, absorbers, layers for charge transport, and transparent conductive electrodes (TCEs). Flexibility, integration, mechanical robustness, and other qualities of specific FSC devices are also highlighted. Measures employed to increase the stability and power conversion efficiency (PCE) of the device using nanocomposite materials have been presented.