TY - JOUR T1 - Recent Advances in the Study of Bulk Crystals: Copper Chalcogenides TT - Recent Advances in the Study of Bulk Crystals: Copper Chalcogenides AU - Akgün, Mehtap AU - Özışık, Hacı PY - 2025 DA - June Y2 - 2025 DO - 10.29002/asujse.1643708 JF - Aksaray University Journal of Science and Engineering JO - Aksaray J. Sci. Eng. PB - Aksaray University WT - DergiPark SN - 2587-1277 SP - 10 EP - 22 VL - 9 IS - 1 LA - en AB - Solid crystalline materials play a crucial role in a range of technological applications, from photovoltaics to thermoelectrics. Increasing the performance of these materials is important in terms of application efficiency. This review provides an overview of recent developments in the field, with a focus on photovoltaic materials, defect chemistry, and thermoelectric properties. Copper sulfide and selenides have advantages such as environmental friendliness, low cost and improved thermoelectric efficiency that set them apart from the competition. Special emphasis is placed on copper sulfides (Cu₂S) and selenides (Cu₂Se) due to their unique structural and electronic properties, making them promising candidates for sustainable energy applications. The manifestation of these copper chalcogens occurs within a variety of crystal structures, contingent on the liquid-like motion of the Cu⁺ ion within the crystal. In this review, the defective, deficiency and regular structures identified in recent years were also discussed. KW - Cu2S KW - Cu2Se KW - thermoelectricity KW - Bulk Crystals N2 - Solid crystalline materials play a crucial role in a range of technological applications, from photovoltaics to thermoelectrics. Increasing the performance of these materials is important in terms of application efficiency. This review provides an overview of recent developments in the field, with a focus on photovoltaic materials, defect chemistry, and thermoelectric properties. Copper sulfide and selenides have advantages such as environmental friendliness, low cost and improved thermoelectric efficiency that set them apart from the competition. Special emphasis is placed on copper sulfides (Cu₂S) and selenides (Cu₂Se) due to their unique structural and electronic properties, making them promising candidates for sustainable energy applications. The manifestation of these copper chalcogens occurs within a variety of crystal structures, contingent on the liquid-like motion of the Cu⁺ ion within the crystal. In this review, the defective, deficiency and regular structures identified in recent years were also discussed. CR - [1] World Bank, Fossil Fuel Energy Consumption, Data, Energy Foss, Fuels Consum, 2016 < https://data.worldbank.org/indicator/EG.USE.COMM.FO.ZS. CR - [2] Yilmaz, F. (2018). Thermodynamic performance evaluation of a novel solar energy based multigeneration system. 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