Spectral broadening in quantum dots-sensitized photoelectrochemical solar cells based on CdSe and Mg-doped CdSe nanocrystals

• Published in: Electrochemistry communications Vol. 10; no. 11; pp. 1699 - 1702
• Main Authors: Lee, Wonjoo, Kwak, Woo-Chul, Min, Sun Ki, Lee, Jung-Chul, Chae, Won-Seok, Sung, Yun-Mo, Han, Sung-Hwan
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 01-11-2008; Amsterdam Elsevier; New York, NY
• Subjects: Applied sciences; CdSe; Chemistry; Co-sensitization; Electrochemistry; Energy; Exact sciences and technology; General and physical chemistry; Natural energy; Photoelectrochemical cells; Photoelectrochemistry. Electrochemiluminescence; Photovoltaic conversion; Quantum dots-sensitized solar cells; Solar cells. Photoelectrochemical cells; Solar energy; Spectral broadening; Quantum dots-sensitized solar cells; Spectral broadening; Co-sensitization; CdSe; Photoelectrochemical cells; Photoelectrochemistry; Titanium IV Oxides; Quantum dot; Peak resolution; Indium tin oxide electrode; Doped materials; Alkaline earth metal; Surface structure; Solar cell; Line broadening; Transmission electron microscopy; Morphology; Photoelectrochemical cell; Magnesium; Cadmium Selenides; Photovoltaic conversion; Nanocrystal; Modified material; Ultraviolet visible spectrometry
• ISSN: 1388-2481; 1873-1902
• DOI: 10.1016/j.elecom.2008.08.025

In order to absorb a broad spectrum in visible region, a co-sensitized TiO
2 electrode was prepared by CdSe and Mg-doped CdSe quantum dots (Q dots). The power conversion efficiency of the co-sensitized Q dots photoelectrochemical solar cells (PECs) showed 1.03% under air mass 1.5 condition (
I
=
100
mW/cm
2), which is higher than that of individual Q dots-sensitized PECs. The incident-photon-to-current conversion efficiency of the co-sensitized PECs showed absorption peaks at 541 and 578
nm corresponding to the two Q dots and displayed a broad spectral response over the entire visible spectrum in the 500–600
nm wavelength domains.