Band structure calculation for quantum dot solar cells using k.p method

Som N. Dahal, Stephen P. Bremner, Christiana B. Honsberg

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Quantum dot hetero structures are possible candidate materials for high efficiency solar cells using advanced approaches such as intermediate bands. Lattice mismatch in the epitaxial growth of quantum dot (QD) causes strain in the structure. Here we report the use of the k.p method to calculate the band structure including the effects of strain, and light and heavy holes. With the modified band gaps due to strain, a material search is performed among III-V binaries and ternaries for a high efficiency QD solar cell material with negligible valence band offsets. It is found that the condition of negligible valence band offsets severely limits the choice of materials. The closest to ideal barrier/dot material system found is Al0.57In 0.43As/InP0.87Sb0.13 corresponding to an efficiency of 58% under x1000 solar concentration for AM 1.5 spectrum.

Original languageEnglish (US)
Title of host publication33rd IEEE Photovoltaic Specialists Conference, PVSC 2008
DOIs
StatePublished - 2008
Event33rd IEEE Photovoltaic Specialists Conference, PVSC 2008 - San Diego, CA, United States
Duration: May 11 2008May 16 2008

Publication series

NameConference Record of the IEEE Photovoltaic Specialists Conference
ISSN (Print)0160-8371

Other

Other33rd IEEE Photovoltaic Specialists Conference, PVSC 2008
CountryUnited States
CitySan Diego, CA
Period5/11/085/16/08

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering

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    Dahal, S. N., Bremner, S. P., & Honsberg, C. B. (2008). Band structure calculation for quantum dot solar cells using k.p method. In 33rd IEEE Photovoltaic Specialists Conference, PVSC 2008 [4922605] (Conference Record of the IEEE Photovoltaic Specialists Conference). https://doi.org/10.1109/PVSC.2008.4922605