Various tandem cell configurations have been reported for highly efficient and spontaneous hydrogen production from photoelectrochemical solar water splitting. However, there is a contradiction between two main requirements of a front photoelectrode in a tandem cell configuration, namely, high transparency and high photocurrent density. Here we demonstrate a simple yet highly effective method to overcome this contradiction by incorporating a hybrid conductive distributed Bragg reflector on the back side of the transparent conducting substrate for the front photoelectrochemical electrode, which functions as both an optical filter and a conductive counter-electrode of the rear dye-sensitized solar cell. The hybrid conductive distributed Bragg reflectors were designed to be transparent to the long-wavelength part of the incident solar spectrum (>500 nm) for the rear solar cell, while reflecting the short-wavelength photons ( <500 nm) which can then be absorbed by the front photoelectrochemical electrode for enhanced photocurrent generation.
Bibliographical noteFunding Information:
This work, supported by European Community under the contract of Association between EURATOM/CEA, was carried out within the framework of the European Fusion Development Agreement (EFDA).
All Science Journal Classification (ASJC) codes
- General Chemistry
- General Biochemistry,Genetics and Molecular Biology
- General Physics and Astronomy