Antimony selenide (Sb 2 Se 3) ... (PCE) of over 20%. 1–3 However, the high processing cost of Si, the toxicity of Cd, the high price of Ga and In, and the scarcity of In, ... However, interfacial defects formed between the Sb 2 Se 3 film and the transport layers, are also present and deserve a separate discussion.Web