Photosensor including photoelectric conversion layer containing perovskite compound, and optical detection device including the same

An optical detection device comprising:

• a photosensor;
• and
• a detector electrically connected to the photosensor, wherein:
• the photosensor includes:
• a first electrode;
• a second electrode that opposes the first electrode;
• and
• a photoelectric conversion layer that is disposed between the first electrode and the second electrode and converts incident light into electric charges,
• at least one electrode selected from the group consisting of the first electrode and the second electrode is light-transmissive,
• the photoelectric conversion layer contains a perovskite compound,
• a fluorescence spectrum of the perovskite compound has a first peak and a second peak,
• the perovskite compound has a first band gap corresponding to the first peak and a second band gap corresponding to the second peak, and
• the photoelectric conversion layer is in ohmic contact with each of the first electrode and the second electrode.

A light-absorbing material comprising:

• a perovskite compound represented by composition formula AMX3, where A is a monovalent cation, M is a divalent cation, and X is a monovalent anion, wherein:
• the M includes Sn2+, and
• a fluorescence spectrum of the light-absorbing material has a first peak and a second peak, and
• the perovskite compound has a first band gap corresponding to the first peak and a second band gap corresponding to the second peak.