Zinc oxide laminate for an organic thin film solar cell
A laminate including a member that serves as a light-transmissive electrode layer and a zinc oxide layer that serves as an electron transport layer for an organic thin-film solar cell is provided. The zinc oxide layer has a Zn deposition amount of not less than 20.0 mg/m 2 and not more than 120.0 mg/m 2 . An S value represented by Formula (1) is not more than 0.90 when, in the zinc oxide layer, an oxygen 1s spectrum obtained by X-ray photoelectron spectroscopy is separated into three peaks, an area of a peak in which a binding energy of a peak top is in a range of not less than 529.0 eV and less than 530.7 eV is represented by α, and an area of a peak in which a binding energy of a peak top is in a range of not less than 530.7 eV and less than 532.2 eV is represented as β: S = β / ( α + β ) . ( 1 )
1 . A laminate serving as a light-transmissive electrode layer and an electron transport layer of an organic thin-film solar cell including the light-transmissive electrode layer, the electron transport layer, an organic semiconductor layer, a hole transport layer and a collector electrode layer in this order, the laminate comprising:
a member that serves as the light-transmissive electrode layer; and
a zinc oxide layer that is disposed on the member serving as the light-transmissive electrode layer and serves as the electron transport layer,
wherein the zinc oxide layer has a Zn deposition amount of not less than 20.0 mg/m 2 and not more than 120.0 mg/m 2 , and
when, in the zinc oxide layer, an oxygen 1s spectrum obtained by X-ray photoelectron spectroscopy is separated into three peaks, an area of a peak in which a binding energy of a peak top is in a range of not less than 529.0 eV and less than 530.7 eV is represented by α, and an area of a peak in which a binding energy of a peak top is in a range of not less than 530.7 eV and less than 532.2 eV is represented by β, an S value represented by Formula (1) is not more than 0.90:
S
=
β
/
(
α
+
β
)
.
(
1
)
2 . An organic thin-film solar cell including a light-transmissive electrode layer, an electron transport layer, an organic semiconductor layer, a hole transport layer and a collector electrode layer in this order and using the laminate according to claim 1 .
3 . A laminate producing method for producing the laminate according to claim 1 , the method comprising:
subjecting the member serving as the light-transmissive electrode layer to cathode polarization in a treatment solution containing a Zn component and a nitrate ion component to thereby form the zinc oxide layer on the member serving as the light-transmissive electrode layer.
4 . An organic thin-film solar cell producing method for producing an organic thin-film solar cell including a light-transmissive electrode layer, an electron transport layer, an organic semiconductor layer, a hole transport layer and a collector electrode layer in this order by using the laminate according to claim 1 .