Stacked-type photoelectric conversion device
View Patent ↗The present invention makes it possible to provide a stacked-type thin-film photoelectric conversion device having high photostability, at a high yield rate and significantly reduced production costs. In a stacked-type photoelectric conversion device having an amorphous silicon-based photoelectric conversion unit and a crystalline silicon-based photoelectric conversion unit stacked thereon or vice versa, an amorphous photoelectric conversion layer included in the amorphous photoelectric conversion unit has a thickness of at least 0.03 μm and less than 0.17 μm, a crystalline photoelectric conversion layer included in the crystalline photoelectric conversion unit has a thickness of at least 0.2 μm and less than 1.0 μm, and a silicon oxide layer of a first conductivity type included in the amorphous photoelectric conversion unit and a silicon layer of a second conductivity type included in the crystalline photoelectric conversion unit make a junction.
1. A stacked-type photoelectric conversion device comprising an amorphous silicon-based photoelectric conversion unit and a crystalline silicon-based photoelectric conversion unit stacked thereon or vice versa, wherein
an amorphous photoelectric conversion layer included in said amorphous photoelectric conversion unit has a thickness of at least 0.03 μm and less than 0.17 μm, and a crystalline photoelectric conversion layer included in said crystalline photoelectric conversion unit has a thickness of at least 0.2 μm and not more than 0.7 μm, and
a silicon oxide layer of a first conductivity type included in said amorphous photoelectric conversion unit and a silicon layer of a second conductivity type included in said crystalline photoelectric conversion unit makes a junction, the silicon oxide layer having an oxygen content of at least 35 atomic %,
wherein said silicon oxide layer of the first conductivity type has a thickness of at least 5 nm and less than 20 nm,
wherein a transparent electrode layer, said amorphous photoelectric conversion unit, and said crystalline photoelectric conversion unit stacked in this order on a transparent insulating substrate are separated by a plurality of parallel linear isolation grooves so as to form a plurality of strip-like stacked-type photoelectric conversion cells, and the plurality of cells are electrically connected and integrated in series via a plurality of connection grooves extending in parallel with said isolation grooves.
2. The stacked-type photoelectric conversion device according to claim 1 , wherein said amorphous photoelectric conversion layer is made of silicon-germanium.
3. The stacked-type photoelectric conversion device according to claim 1 , wherein said crystalline photoelectric conversion unit further includes a silicon oxide layer of the first conductivity type on a side of said crystalline photoelectric conversion layer farther from said amorphous photoelectric conversion unit.
4. A stacked-type photoelectric conversion device comprising an amorphous silicon-based photoelectric conversion unit and a crystalline silicon-based photoelectric conversion unit stacked thereon or vice versa, wherein
an amorphous photoelectric conversion layer included in said amorphous photoelectric conversion unit has a thickness of at least 0.03 μm and less than 0.17 μm, and a crystalline photoelectric conversion layer included in said crystalline photoelectric conversion unit has a thickness of at least 0.2 μm and not more than 0.7 μm, and
a silicon oxide layer of a first conductivity type included in said amorphous photoelectric conversion unit and a silicon layer of a second conductivity type included in said crystalline photoelectric conversion unit makes a junction, the silicon oxide layer having an oxygen content of at least 35 atomic %,
wherein said silicon oxide layer of the first conductivity type has a thickness of at least 5 nm and less than 20 nm,
wherein said crystalline photoelectric conversion unit, said amorphous photoelectric conversion unit, and a transparent electrode layer stacked in this order on an insulating substrate are separated by a plurality of parallel linear isolation grooves so as to form a plurality of strip-like stacked-type photoelectric conversion cells, and the plurality of cells are electrically connected and integrated in series via a plurality of connection grooves extending in parallel with said isolation grooves.
5. The stacked-type photoelectric conversion device according to claim 4 , wherein said amorphous photoelectric conversion layer is made of silicon-germanium.
6. The stacked-type photoelectric conversion device according to claim 4 , wherein said crystalline photoelectric conversion unit further includes a silicon oxide layer of the first conductivity type on a side of said crystalline photoelectric conversion layer farther from said amorphous photoelectric conversion unit.
7. The stacked-type photoelectric conversion device according to claim 4 , wherein the silicon oxide layer has electrical conductivity of approximately 10 −9 to 10 −6 S/cm.
8. The stacked-type photoelectric conversion device according to claim 1 , wherein the silicon oxide layer has electrical conductivity of approximately 10 −9 to 10 −6 S/cm.