"I'd put my money on the sun and solar energy. What a source of power! I hope we don't have to wait until oil and coal run out before we tackle that." We have come a long way since these words of wisdom from Thomas Edison way back in 1931! Solar energy or photovoltaic (PV), a key component in the renewable energy mix, continues to grow, with a record 57 GWp installed in 2015. The compound annual growth rate of PV installations was 41 % in the 2000 to 2015 period (Fraunhofer ISE). Wafer-based crystalline silicon is still the dominant technology, accounting for more than 90% of global PV production. Still playing catch up are the many thin film technologies led by cadmium telluride (CdTe). The early predictions of thin film technologies surge did not materialize, resulting in the failure of many startups. But the technologies are alive and well, amidst continuing efforts to lower cost and improve conversion efficiency. Advanced materials still hold the keys to success in the race to boost PV efficiency levels.