Fermi Level Dependence of a Working Electrode on the Open Circuit Voltage in a Sensitized Thermal Cell

• Published in: Chemistry letters Vol. 49; no. 9; pp. 1013 - 1016
• Main Authors: Matsushita, Sachiko, Sugawara, Seiya, Ikeda, Takumi, Araki, Takuma, Sekiya, Hayato, Kohata, Haruki, Isobe, Toshihiro, Nakajima, Akira
• Format: Journal Article
• Language: English
• Published: Tokyo The Chemical Society of Japan 05-09-2020; Chemical Society of Japan
• Subjects: Dye-sensitized solar cells; Dyes; Electrodes; Electron transport; Excitation; Fermi level; Open circuit voltage; Photovoltaic cells; Thermal energy; Fermi level; Dye-sensitized solar cell; Semiconductor
• ISSN: 0366-7022; 1348-0715
• DOI: 10.1246/cl.200322

A sensitized thermal cell is a new thermal energy device based on a dye-sensitized solar cell; thermally excited carriers in a semiconductor are used instead of photon-excited carriers in a dye. In semiconductor-sensitized batteries, open-circuit voltage in thermal excitation is lower than in optical excitation, but the reason has been unclear. By changing the doping amount of the electron transport layer, we experimentally show that the voltage in thermal excitation is dependent on the Fermi level of the “entire” semiconductor electrode.