1. of the photocurrent such that the alternating component is substantially fed to a current/voltage transformer (OP, R2). Said transformer converts the photocurrent into a corresponding voltage signal (U¿a?).

2. Example: Archt; Increased photocurrent amplitude Examples: eArch3.0, eArcht3.0; Browse Archaerhodopsin plasmids

3. The optical absorption of the semiconductor quantum well region varies in response to variations in the photocurrent.

4. The photocurrent produced was dependent on pH, on the type of artificial electron acceptor or inhibitor added, and on the electrode potential.

5. According to the present invention, the dye-sensitized solar cell is provided in which the co-adsorbent body having a hole conducting property is contained in the light-absorbing layer, to thereby achieve improved photocurrent and photovoltage.