Photovoltaic response for high density InGaAs coupled quantum dots

K. Y. Chuang*, K. D. Tzeng, T. E. Tzeng, T. S. Lay, Chien-Chung Lin, H. Cho, David J Y Feng

*Corresponding author for this work

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

Abstract

In order to enhance absorption at infrared range for GaAs based solar cell, we insert the nine-layer of vertically coupled quantum dots (VCQDs) into the active layer. We fine modulated the GaAs spacer thickness of coupled In 0.75Ga0.25As QDs, and investigated the effects on photovoltaic response. For the open-circuit voltage (Voc), the values decreases from 0.61 V to 0.55 V as the spacer thickness (d) decreases from d= 15 nm to 5 nm for the nine-layer VCQDs solar cells. The reduction of V oc for the VCQDs solar cells is attributed to the accumulation of compressive strain energy in the active QD region. For the sample of d=10 nm shows the best performance of current density (Jsc24 mA/cm 2) and efficiency (η10.6). The Jsc and η are increases by 55% and 112% more than the device without QDs, respectively.

Original languageEnglish
Title of host publicationProgram - 38th IEEE Photovoltaic Specialists Conference, PVSC 2012
Pages781-784
Number of pages4
DOIs
StatePublished - 26 Nov 2012
Event38th IEEE Photovoltaic Specialists Conference, PVSC 2012 - Austin, TX, United States
Duration: 3 Jun 20128 Jun 2012

Publication series

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

Conference

Conference38th IEEE Photovoltaic Specialists Conference, PVSC 2012
CountryUnited States
CityAustin, TX
Period3/06/128/06/12

Keywords

  • InGaAs
  • Molecular beam epitaxy
  • Photovoltaic
  • Quantum dots
  • Solar cells
  • Vertically coupling

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  • Cite this

    Chuang, K. Y., Tzeng, K. D., Tzeng, T. E., Lay, T. S., Lin, C-C., Cho, H., & Feng, D. J. Y. (2012). Photovoltaic response for high density InGaAs coupled quantum dots. In Program - 38th IEEE Photovoltaic Specialists Conference, PVSC 2012 (pp. 781-784). [6317720] (Conference Record of the IEEE Photovoltaic Specialists Conference). https://doi.org/10.1109/PVSC.2012.6317720