文档介绍：Solar aspects of papers
BOOSTING THE EFFICIENCY OF QUANTUM DOT SENSITIZED SOLAR CELL BY MANGANESE DOPING
Pralay K. Santra and Prashant V. Kamat
Radiation Laboratory,
Chemistry & Biochemistry, and Chemical & Biomolecular Engineering, University of Notre Dame, Notre Dame, Indiana 46556, United States
INTRODUCTION
Quantum Dot Sensitized Solar Cells (QDSC) (1-2) can petitive if one could achieve power conversion parable to other emerging solar cell technologies. The factors limiting the power conversion efficiency in QDSC include bination of charge carriers with redox couple at the semiconductor interface, slower hole transfer and counter electrode performance. We have now undertaken a series of steps to alter the properties of semicondctor nanocrystals to improve the performance of QDSC. By doping optically active transition metal ions, ., Mn2+, it is possible to modify the electronic and photophysical properties of quantum dots (QD). The dopant creates electronic states in the midgap region of the QD thus altering the charge separation and bination dynamics. Mn doped CdS show emission at ~ 585 nm due to the Mn d-d However, this transition is both spin and orbitally forbidden resulting in a very long lifetime in the range of several hundreds of μs. By employing Mn2+ doping of CdS, we have now eeded significantly in improving QDSC pare to undoped system. T