Photoelectric conversion device and manufacturing method thereof
A photoelectric conversion device in an embodiment includes a first photoelectric conversion part including a first transparent electrode, a first photoelectric conversion layer, and a first counter electrode and a second photoelectric conversion part including a second transparent electrode, a second photoelectric conversion layer, and a second counter electrode, the first photoelectric conversion part and the second photoelectric conversion part being provided on a transparent substrate. The first counter electrode and the second transparent electrode are electrically connected by a connection part. As for the first photoelectric conversion layer and the second photoelectric conversion layer, adjacent portions of the adjacent first and second photoelectric conversion layers are electrically separated by an inactive region having electrical resistance higher than that of the first and second photoelectric conversion layers.
1. A photoelectric conversion device comprising:
a transparent substrate;
a first photoelectric conversion part including a first transparent electrode provided on the transparent substrate, a first photoelectric conversion layer disposed on the first transparent electrode and containing a first perovskite compound, and a first counter electrode disposed on the first photoelectric conversion layer;
a second photoelectric conversion part including a second transparent electrode provided on the transparent substrate adjacently to the first transparent electrode and separated from the first transparent electrode, a second photoelectric conversion layer disposed on the second transparent electrode adjacently to the first photoelectric conversion layer and containing a second perovskite compound, and a second counter electrode disposed on the second photoelectric conversion layer;
a connection part electrically connecting the first counter electrode and the second transparent electrode; and
an inactive region provided between the first photoelectric conversion layer and the second photoelectric conversion layer to electrically separate adjacent portions of the first photoelectric conversion layer and the second photoelectric conversion layer, and the inactive region having electrical resistance higher than electrical resistance of the first and second photoelectric conversion layers, wherein
each of the first and second perovskite compounds has a composition represented by a general formula:
ABX 3 ,
where A is at least one monovalent cation selected from the group consisting of a methylammonium ion, a formamidinium ion, a potassium ion, a rubidium ion, and a cesium ion, B is at least one divalent cation selected from the group consisting of a lead ion, a germanium ion, and a tin ion, and X is at least one monovalent halogen anion selected from the group consisting of an iodine ion, a bromide ion, and a chlorine ion, and
the inactive region contains a halide of at least one metal selected from the group consisting of potassium, rubidium, cesium, lead, germanium, and tin which are a constituent metal element of the monovalent cation or the divalent cation.
2. The device according to claim 1 , wherein the halide of the metal contains a lead halide.
3. The device according to claim 1 , wherein the inactive region contains 50 vol % or more of the halide of the metal.
4. The device according to claim 1 , wherein the inactive region is formed in a region within 1 μm inward from an end portion of the second counter electrode.
5. The device according to claim 1 , wherein the inactive region contains the halide of the metal formed on at least a wall surface of a groove provided to separate the first photoelectric conversion layer and the second photoelectric conversion layer which are adjacent to each other.