Abstract: In an embodiment, an electrospinning apparatus includes a transfer unit, a spinning head and an air ejection unit. In the transfer unit, a transfer target is transferred along a transfer direction, and a spinning head is capable of ejecting a material liquid toward the transfer unit from a first direction, which intersects the transfer direction. The air ejection unit forms an air flow that flows across the transfer unit toward an area located on an opposite side across the transfer unit in a second direction, which intersects both the transfer direction and the first direction, by ejecting air against the transfer unit from one side of the second direction.

Abstract: A solar cell according to an embodiment includes a p? electrode, an n? electrode, a p? type light-absorbing layer on the p? electrode, and an n? type layer between the p? type light-absorbing layer and the n? electrode. A first region is included in the p? type light-absorbing layer from a surface on the n? type layer side toward the p? electrode. The first region includes n? type dopant. A thickness of the first region is 1500 [nm] or more and a thickness of the p? type light-absorbing layer [nm]. A concentration of the n? type dopant of the first region is 1.0×1014 [cm?3] or more and 1.0×1019 [cm?3] or less. The concentration of the n? type dopant of the first region and a concentration of hole of the first region satisfy 10?the concentration of the n? type dopant/the concentration of hole?5.0×1026.

Abstract: In an embodiment, a spinning head includes a head main body and a nozzle, and a storage cavity storing a material liquid is formed inside the head main body. The nozzle projects from an outer peripheral surface of the head main body, and an ejection port ejecting a material liquid is formed at a projection end. A flow path communicating with the storage cavity extends through an inside of the nozzle to the ejection port. The ejection port is located on an upper side of a vertical direction relative to the connecting part to the storage cavity, and at least a part of the flow path is tilted relative to a horizontal plane. An upper end of the connecting part of the flow path to the storage cavity is located at the same height as or on the upper side relative to an upper end of the storage cavity.

Abstract: According to an embodiment, an electrospinning head includes a nozzle and an uneven surface. The nozzle is made from an electrically conductive material, and a flow path is formed inside the nozzle. On the outer surface of the nozzle, an ejection port capable of ejecting a material liquid supplied to the flow path is formed. The uneven surface is formed in the vicinity of the projection port on the outer surface of the nozzle, and an uneven shape of the uneven surface is formed around the entire circumference of the circumferential direction of the nozzle and is along the extending direction of the flow path.

Abstract: According to an embodiment, an electrospinning apparatus includes an electrospinning head and a storage case. The electrospinning head includes a nozzle capable of ejecting a material liquid and is movable between a first move position and a second move position. In the storage case, a storage hollow capable of accommodating a nozzle is formed, and an opening to the outside of the storage hollow is formed in the storage case. The storage case causes the nozzle of the electrospinning head located at the first move position to be arranged at a position separate from the storage hollow and causes the nozzle of the electrospinning head located at the second move position to be accommodated inside the storage hollow.

Abstract: According to an embodiment, an electrospinning apparatus includes an electrospinning head and a storage case. The electrospinning head includes a nozzle capable of ejecting a material liquid and is movable between a first move position and a second move position. In the storage case, a storage hollow capable of accommodating a nozzle is formed, and an opening to the outside of the storage hollow is formed in the storage case. The storage case causes the nozzle of the electrospinning head located at the first move position to be arranged at a position separate from the storage hollow and causes the nozzle of the electrospinning head located at the second move position to be accommodated inside the storage hollow.

Abstract: According to an embodiment, an electrospinning head includes a nozzle and an uneven surface. The nozzle is made from an electrically conductive material, and a flow path is formed inside the nozzle. On the outer surface of the nozzle, an ejection port capable of ejecting a material liquid supplied to the flow path is formed. The uneven surface is formed in the vicinity of the projection port on the outer surface of the nozzle, and an uneven shape of the uneven surface is formed around the entire circumference of the circumferential direction of the nozzle and is along the extending direction of the flow path.