Core Viewpoint - The article discusses the emergence of a new type of thin and lightweight photovoltaic cell known as "brass mine photovoltaic cells," which are positioned as competitors to perovskite solar cells. Group 1: Industry Overview - Brass mine photovoltaic cells are characterized by their thickness of 0.6 to 0.7 mm, making them comparable to a thin plastic mat, with a weight density of approximately 0.7 kg/m², similar to regular corrugated cardboard [1]. - This type of photovoltaic cell was previously referred to as "CIS type" or "CIGS type," named after the compound semiconductors used, which primarily consist of copper (Cu), indium (In), gallium (Ga), sulfur (S), and selenium (Se) [1].