The calculated band alignment for Cu 2 SiSe 3 is shown in Figure . The ionization potential is calculated to be 5.9 eV, similar to other Cubased absorbers. Thus we can expect Cu 2 SiSe 3 to be a p-type material and that initial devices could leverage previously-developed device architectures (e.g. for CZTSe and CIGSe) for easy fabrication. Due to the high predicted efficiency and composition of non-toxic/earth- ) taken from various experimental and computational references. abundant elements, Cu 2 SiSe 3 is a promising candidate as a photovoltaic absorber, warranting further investigation.