Due to their attractive band gap properties and van der Waals structure, 2D binary chalcogenide materials have been widely investigated in the last decade, finding applications in several fields such as catalysis, spintronics, and optoelectronics. Ternary 2D chalcogenide materials are a subject of growing interest in materials science due to their superior chemical tunability which endows tailored properties to the devices prepared thereof. In the family of AIIBIII2XVI4, ordered ZnIn2S4-like based photocatalytic systems have been studied meticulously. In contrast, reports on disordered phases appear to a minor extent. Herein, a photoelectrochemical (PEC) detector based on the pseudo-binary MnIn2Se4 system is presented. A combination of optical measurements and DFT calculations confirmed that the nature of the bandgap in MnIn2Se4 is indirect. Its performance outclasses that of parent compounds, reaching responsivity values of 8.41 mA W-1. The role of the non-centrosymmetric crystal structure is briefly discussed as a possible cause of improved charge separation of the photogenerated charge carriers.

Departamento de Ciencia de los Materiales e Ingeniería Metalúrgica y Química Inorgánica Facultad de Ciencias Universidad de Cádiz Campus Río San Pedro S N Puerto Real 11510 Cádiz Spain

Department of Inorganic Chemistry University of Chemistry and Technology Prague Technická 5 166 28 Prague 6 Czech Republic

Department of Semiconductor Materials Engineering Faculty of Fundamental Problems of Technology Wrocław University of Science and Technology Wybrzeże Wyspiańskiego 27 50 370 Wrocław Poland

Instituto de Universitario Tecnología Química Universitat Politècnica de València Consejo Superior de Investigaciones Científicas Universitat Politècnica de València Avda de los Naranjos s n 46022 Valencia Spain

Instituto Universitario de Investigación de Microscopía Electrónica y Materiales Facultad de Ciencias Universidad de Cádiz Campus Río San Pedro S N Puerto Real 11510 Cádiz Spain

Laboratory for Materials Simulations Paul Scherrer Institut 5232 Villigen Switzerland

Theory and Simulation of Materials Lausanne CH 1015 Lausanne Switzerland

U Bremen Excellence Chair Bremen Center for Computational Materials Science and MAPEX Center for Materials and Processes University of Bremen D 28359 Bremen Germany

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