It has been shown that efficiency of a photovoltaic cell can be enhanced in the presence of intermediate levels in a semiconductor band gap. However the practical realization of this concept is difficult due to low absorption by the intermediate levels. We show that it is possible to significantly increase photon absorption and generate more power utilizing noise induced quantum coherence between intermediate electronic states which is created due to interference among the absorption pathways. We discuss possible experimental demonstration of this effect using confined electronic-hole states in self assembled quantum dots.
Financed by the National Centre for Research and Development under grant No. SP/I/1/77065/10 by the strategic scientific research and experimental development program:
SYNAT - “Interdisciplinary System for Interactive Scientific and Scientific-Technical Information”.