Photoelectrochemical reaction device

A photoelectrochemical reaction device comprising:

• a solution tank including a first solution tank configured to contain a first solution, and a second solution tank configured to contain a second solution;
• a stack which includes a first electrode accommodated in the first solution tank, a second electrode accommodated in the second solution tank and formed below the first electrode, and a photovoltaic layer formed between the first electrode and the second electrode and configured to perform charge separation by light energy from above, the stack separating the first solution tank and the second solution tank;
• an ion transmitting member formed adjacent to the stack, and configured to separate the first solution tank and the second solution tank together with the stack;
• and
• a reflecting member accommodated in the first solution tank and arranged immediately above the ion transmitting member.

A photoelectrochemical reaction device comprising:

• a solution tank including a first solution tank configured to contain a first solution, and a second solution tank configured to contain a second solution;
• a support substrate configured to separate the first solution tank and the second solution tank, and including a slit extending from an obverse surface to a reverse surface of the support substrate;
• a stack including a first electrode in contact with the first solution, a second electrode in contact with the second solution and formed below the first electrode, and a photovoltaic layer formed between the first electrode and the second electrode and configured to perform charge separation by light energy from above, the stack covering the slit;
• and
• a reflecting member accommodated in the first solution tank and arranged immediately above a region of the support substrate except for the slit.

A photoelectrochemical reaction device comprising:

• a solution tank including a first solution tank configured to contain a first solution, and a second solution tank configured to contain a second solution;
• a stack which includes a first electrode accommodated in the first solution tank, a second electrode accommodated in the second solution tank and formed below the first electrode, and a photovoltaic layer formed between the first electrode and the second electrode and configured to perform charge separation by light energy from above, the stack separating the first solution tank and the second solution tank;
• and
• an ion transmitting member formed adjacent to the stack, and configured to separate the first solution tank and the second solution tank together with the stack,
• wherein a wedge shaped recess is formed inside the first solution tank in a position immediately above the ion transmitting member.