Universidad Autonoma del Estado de Hidalgo 1 article published in JoVE Chemistry The Effect of Ultraviolet Radiation on the Chemical Bath Deposition of Bis(thiourea) Cadmium Chloride Crystals and the Subsequent CdS Obtention Luis Eduardo Trujillo Villanueva1, Felipe Legorreta García1, Iker Rodrigo Chávez-Urbiola2, Francisco Javier Willars-Rodriguez2, Rafael Ramírez- Bon2, Marius Ramírez-Cardona1, Leticia Esperanza Hernández-Cruz1, Edgar Arturo Chávez-Urbiola3 1Área Académica de Ciencias de la Tierra y Materiales, Universidad Autónoma del Estado de Hidalgo, 2Área de Materiales Optoelectrónicos, CINVESTAV-IPN, 3CONACyT-Área Académica de Ciencias de la Tierra y Materiales, Universidad Autónoma del Estado de Hidalgo This article presents a protocol for the synthesis of bis(thiourea) cadmium chloride crystals by chemical bath deposition. Two experiments are described: one aided by ultraviolet light compared to one without ultraviolet light.