Abstract: A multi-junction solar cell module of an embodiment includes: a first solar cell module disposed on a light incident side and including a plurality of first solar cells and a first connection wiring electrically connecting the plurality of the first solar cells; a second solar cell module including a plurality of second solar cells and a second connection wiring electrically connecting the plurality of the second solar cells; and an adhesive layer between the first solar cell module and the second solar cell module.

Abstract: A solar cell of an embodiment includes: a p-electrode in which a first p-electrode and a second p-electrode are laminated; a p-type light-absorbing layer in direct contact with the first p-electrode; an n-type layer in direct contact with the p-type light-absorbing layer; and an n-electrode. The first p-electrode is disposed between the p-type light-absorbing layer and the second p-electrode. The p-type light-absorbing layer is disposed between the n-type layer and the first p-electrode. The n-type layer is disposed between the p-type light-absorbing layer and the n-electrode. The first p-electrode includes a metal oxide containing Sn as a main component.

Abstract: A solar cell of an embodiment includes: a substrate; an n-electrode; an n-type layer; a p-type light absorption layer which is a semiconductor of a Cu-based oxide; and a p-electrode. The n-electrode is disposed between the substrate and the n-type layer. The n-type layer is disposed between the n-electrode and the p-type light absorption layer. The p-type light absorption layer is disposed between the n-type layer and the p-electrode. The n-type layer is disposed closer to a light incident side than the p-type light absorption layer. The substrate is a single substrate included in the solar cell.

Abstract: According to one embodiment, a solar cell includes a first electrode, a second electrode, a photoelectric conversion layer, and a plurality of insulants. The photoelectric conversion layer is provided between the first electrode and the second electrode. The plurality of insulants is disposed on a face of the first electrode. The face faces the second electrode. Any adjacent two of the plurality of insulants are disposed with a void interposed between the adjacent two.

Abstract: According to one embodiment, a solar cell includes a first electrode, a second electrode, a light-absorbing layer, and a plurality of metal parts. The light-absorbing layer is interposed between the first electrode and the second electrode. The metal parts are present on a surface of the first electrode opposing the second electrode. A void is provided in at least a part between the metal parts.

Abstract: A solar cell of an embodiment includes a first electrode, a light absorption layer, an n-type layer, and a second electrode. The light absorption layer exists between the first electrode and the n-type layer. The n-type layer exists between the light absorption layer and the second electrode. The light absorption layer contains Cu2O. The n-type layer contains a sulfide.

Abstract: According to one embodiment, a solar cell system includes a first solar cell including a first terminal and a second terminal, a second solar cell including a third terminal and a fourth terminal, and a voltage converter including a fifth terminal and a sixth terminal. The third terminal is electrically connected to the first terminal. The fifth terminal is electrically connected to the fourth terminal. The voltage converter causes a second absolute value to be smaller than a first absolute value. The first absolute value is of a difference between a first potential difference and a second potential difference. The first potential difference is between the first and second terminals. The second potential difference is between the first and fourth terminals. The second absolute value is of a difference between the first and third potential differences. The third potential difference is between the first and sixth terminals.

Abstract: A solar cell of an embodiment includes a high-resistance oxide layer; a first electrode comprising line-patterned conductive members or mesh-patterned conductive members; a second electrode; and a light absorbing layer between the high-resistance oxide layer and the second electrode. The first electrode is disposed between the high-resistance oxide layer and the light absorbing layer.

Abstract: A solar cell of an embodiment includes: a substrate having a light transmitting property; a first electrode including a plurality of metal portions and having a light transmitting property; a light absorbing layer disposed on the first electrode and absorbing light; and a second electrode disposed on the light absorbing layer and having a light transmitting property.

Abstract: A multi-junction solar cell of an embodiment includes a first solar cell including a first photoelectric conversion device, a second solar cell including a plurality of second photoelectric conversion devices connected in series and having a back contact, and an insulating layer between the first solar cell and the second solar cell. A device isolation region is provided between the second photoelectric conversion devices connected in series.

Abstract: A photoelectric conversion device of an embodiment has a substrate, a bottom electrode on the substrate, a light absorbing layer on the bottom electrode, an n-type layer on the light absorbing layer, a transparent electrode on the n-type layer, and an oxide layer on the transparent electrode. nA and nB satisfy the relation 100/110?nB/nA?110/100. nA is the refractive index of the transparent electrode. nB is the refractive index of the oxide layer.

Abstract: A photoelectric conversion device of an embodiment has a substrate, a bottom electrode comprising an electrode layer on the substrate and an intermediate interface layer, a light absorbing layer on the intermediate interface layer. The electrode layer comprises Mo or W. The intermediate interface layer is a compound thin film of a compound comprising Mo or W and at least one element X selected from the group consisting of S, Se, and Te. The intermediate interface layer has a crystal phase and an amorphous phase with which the crystal phase is covered.

Abstract: A solar module of an embodiment includes: a first solar panel having a plurality of first submodules each including a plurality of first solar cells; and a second solar panel layered with the first solar panel, the second solar panel having a plurality of second submodules each including a plurality of second solar cells. The first solar panel is provided on a side where light is incident. The first solar panel and the second solar panel are electrically connected in parallel. The plurality of first solar cells included in each of the plurality of first submodules is electrically connected in series. The plurality of first submodules is electrically connected in parallel. The plurality of second solar cells included in each of the plurality of second submodules is electrically connected in series. The plurality of second submodules is electrically connected in parallel.

Abstract: A photoelectric conversion element of an embodiment includes a first electrode, a second electrode, a light-absorbing layer having a compound containing group I-III-VI elements between the first electrode and the second electrode, and an n-type layer between the light-absorbing layer and the second electrode. A group IV element is contained in the light-absorbing layer closer to the n-type layer. A maximum peak of the concentration of group IV element exists in a region down to a depth of 0.2 ?m from a main surface of the light-absorbing layer facing to the n-type layer toward the first electrode.

Abstract: A solar cell module of an embodiment includes: a first solar panel having a plurality of first submodules each including a plurality of first solar cells; and a second solar panel layered with the first solar panel, the second solar panel having a plurality of second solar cells. The first solar panel exists on the side where light is incident. The first solar panel and the second solar panel are electrically connected in parallel. The first solar cells included in the first submodules are electrically connected in series. The first submodules are electrically connected in parallel.

Abstract: A solar cell of an embodiment includes: a first electrode; a second electrode; a light-absorbing layer interposed between the first electrode and the second electrode; a dot region interposed between the first electrode and the light-absorbing layer, the dot region including dots.

Abstract: An optical element of an embodiment includes an optical element made of a material transparent to light, the optical element including: a back surface facing the front surface; and a connection surface. The front surface includes a recessed surface in a region facing the connection surface. The recessed surface has a point closest to the connection surface as a closest point, and has a first singular point other than the closest point.

Abstract: According to one embodiment, a solar cell module includes a solar cell panel and a concentrator. The solar cell panel includes a solar cell. The concentrator reflects light incident from the outside and irradiates the light onto the solar cell. The concentrator has a first surface and a second surface. The first surface reflects light incident at a first incident angle and irradiates the light incident at the first incident angle onto a first portion within the area of the solar cell. The second surface reflects light incident at a second incident angle and irradiates the light incident at the second incident angle onto a second portion within the area of the solar cell. The second incident angle is different from the first incident angle. The second portion is different from the first portion. The first surface and the second surface are asymmetric as viewed from the solar cell.

Abstract: A photoelectric conversion element of an embodiment includes a first electrode, a second electrode, and a light absorbing layer, containing a chalcopyrite-type compound containing at least a group-Ib element, a group-IIIb element, and a group-VIb element, between the first electrode and the second electrode. The group-VIb element includes at least sulfur. An average sulfur atom concentration S1 in a side surface region of the light absorbing layer is higher than an average sulfur atom concentration S2 in an inside region of the light absorbing layer.

Abstract: A solar cell of an embodiment has a first solar cell, a second solar cell, and an intermediate layer between the first and second solar cells. The first solar cell has a Si layer as a light absorbing layer. The second solar cell has as a light absorbing layer one of a group I-III-VI2 compound layer and a group I2-II-IV-VI4 compound layer. The intermediate layer has an n+-type Si sublayer and at least one selected from a p+-type Si sublayer, a metal compound sublayer, and a graphene sublayer. The metal compound sublayer is represented by MX where M denotes at least one type of element selected from Nb, Mo, Pd, Ta, W, and Pt and X denotes at least one type of element selected from S, Se, and Te.