Research paper of the month
April 2014 - Improved Open–Circuit Voltage in ZnO–PbSe Quantum Dot Solar Cells by Understanding and Reducing Losses Arising from the ZnO Conduction Band Tail
A fundamental loss mechanism in depleted-heterojunction colloidal quantum dot solar cells (CQDSCs) is identified to arise from the metal oxide conduction band tail. This loss is studied in ZnO–PbSe CQDSCs and minimized by optimizing the ZnO–PbSe conduction band alignment via magnesium-doping of the ZnO. Significant improvements in open-circuit voltage and efficiency are achieved.
The paper is available from: http://onlinelibrary.wiley.com/doi/10.1002/aenm.201301544/abstract
Figure: Improvement in the open-circuit voltage of Zn1-xMgxO – PbSe colloidal quantum dot solar cells by reducing the metal oxide band-tail loss mechanism (illustration inset).
Hoye, R. L. Z., Ehrler, B., Böhm, M. L., Muñoz-Rojas, D., Altamimi, R. M., Alyamani, A. Y., Vaynzof, Y., Sadhanala, A., Ercolano, G., Greenham, N. C., Friend, R. H., MacManus-Driscoll, J. L. and Musselman, K. P., "Improved Open–Circuit Voltage in ZnO–PbSe Quantum Dot Solar Cells by Understanding and Reducing Losses Arising from the ZnO Conduction Band Tail" Adv. Energy Mater. (2014)