Multilayer Graphene Oxide/Cadmium Selenide Quantum-Dot-Coated Titanium Dioxide Heterojunction Solar Cell

作者：Shanmugam Mariyappan^*; Bansal Tanesh; Durcan Chris A; Yu Bin

来源：IEEE Electron Device Letters, 2012, 33(8): 1165-1167.

DOI：10.1109/LED.2012.2201911

• Cadmium selenide (CdSe)
• graphene oxide (GO)
• heterojunction
• quantum dot (QD)
• solar cell
• titanium dioxide

We demonstrate a heterojunction solar cell employing multilayer graphene oxide (ML-GO) as the hole-conducting layer and cadmium selenide (CdSe) quantum-dot-coated titanium dioxide (TiO2) as the photoactive material. Multilayer graphene, synthesized by a chemical-vapor-deposition technique, is treated with low-power (25-W) oxygen plasma (similar to 100 sccm) to convert into ML-GO, as confirmed by Raman spectroscopy. The ML-GO exhibits an optical bandgap of 3.6 eV extracted from UV-visible absorption spectroscopy. The heterojunction solar cell is implemented with a stacked heterostructure of ITO/TiO2/CdSe/ML-GO/Pt, yielding a short-circuit current density of 11.2 mA/cm(2), an open-circuit voltage of 652 mV, and a photoconversion efficiency of 4.1% under a standard AM 1.5 illumination condition.

• 出版日期2012-8