Quantum-Dot Intermediate-Band Solar Cells with Inverted Band Alignment

A. Franceschetti, S. Lany, G. Bester

Research output: Contribution to journalArticlepeer-review

6 Scopus Citations


The intermediate-band concept was proposed over a decade ago as a possible route to increase the efficiency of single-junction solar cells. Despite a number of experimental attempts to realize this concept, no efficiency improvement over conventional single-junction solar cells has so far been demonstrated. This is likely due to the fact that the intermediate band itself acts to enhance electron-hole recombination. In this work we propose a novel intermediate-band solar-cell architecture based on doped semiconductor nanostructures having an inverted type-I band alignment with the surrounding host. The recombination of carriers in the nanostructures is prevented by ultra-fast charge transfer to the host, thereby removing the main obstacle to achieve high conversion efficiency.

Original languageAmerican English
Pages (from-to)15-17
Number of pages3
JournalPhysica E: Low-Dimensional Systems and Nanostructures
Issue number1
StatePublished - 2008

NREL Publication Number

  • NREL/JA-590-43542


  • Intermediate-band solar cells
  • Quantum dots


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