Theoretical analysis for intermediate band and tandem hybrid solar cell materials

Jongwon Lee, Som N. Dahal, Christiana Honsberg

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

1 Citation (Scopus)

Abstract

The efficiency limit of an intermediate band (IB) solar cell can be increased by a "tandem" configuration of multiple intermediate band devices. Thermodynamic models show that the efficiency of a two-stack tandem of IB devices achieves the efficiency of a six junction series connected solar cell. The efficiency of an IB in conjunction with a single or double stack tandem has similar efficiency advantages. Further, analysis of the materials which can be used to implement IB solar cells in a tandem configuration shows advantages relating to the ability to implement IB materials with quantum wells or quantum dots. For a single IB solar cell, a key difficulty is identifying materials for the barrier and the quantum well which have a small valence band offset and large conduction band offset (or the reverse). The use of an IB solar cell as the bottom solar cell of a tandem allows a larger range of materials with suitable barrier band gaps and a smaller ideal conduction band offset. A further theoretical advantage of such a structure is that it avoids the extremely low open circuit voltages achieved from pn junctions in low bandgap materials; for example, the thermodynamic optimum for a 6 junction tandem solar cell has its lowest bandgap below 0.4 eV. We present a thermodynamic model for IB hybrid tandem configurations which does not assume spectral selectivity among the different solar cells and predicts that a barrier/quantum dot structure can have an efficiency as high as 60 to 70 percent at 1X blackbody radiation.

Original languageEnglish (US)
Title of host publicationConference Record of the IEEE Photovoltaic Specialists Conference
Pages68-72
Number of pages5
DOIs
StatePublished - 2012
Event38th IEEE Photovoltaic Specialists Conference, PVSC 2012 - Austin, TX, United States
Duration: Jun 3 2012Jun 8 2012

Other

Other38th IEEE Photovoltaic Specialists Conference, PVSC 2012
CountryUnited States
CityAustin, TX
Period6/3/126/8/12

Fingerprint

Solar cells
Energy gap
Thermodynamics
Conduction bands
Semiconductor quantum wells
Semiconductor quantum dots
Open circuit voltage
Valence bands
Radiation

Keywords

  • intermediate band
  • material
  • tandem
  • thermodynamic limit

ASJC Scopus subject areas

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

Cite this

Lee, J., Dahal, S. N., & Honsberg, C. (2012). Theoretical analysis for intermediate band and tandem hybrid solar cell materials. In Conference Record of the IEEE Photovoltaic Specialists Conference (pp. 68-72). [6317570] https://doi.org/10.1109/PVSC.2012.6317570

Theoretical analysis for intermediate band and tandem hybrid solar cell materials. / Lee, Jongwon; Dahal, Som N.; Honsberg, Christiana.

Conference Record of the IEEE Photovoltaic Specialists Conference. 2012. p. 68-72 6317570.

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

Lee, J, Dahal, SN & Honsberg, C 2012, Theoretical analysis for intermediate band and tandem hybrid solar cell materials. in Conference Record of the IEEE Photovoltaic Specialists Conference., 6317570, pp. 68-72, 38th IEEE Photovoltaic Specialists Conference, PVSC 2012, Austin, TX, United States, 6/3/12. https://doi.org/10.1109/PVSC.2012.6317570
Lee J, Dahal SN, Honsberg C. Theoretical analysis for intermediate band and tandem hybrid solar cell materials. In Conference Record of the IEEE Photovoltaic Specialists Conference. 2012. p. 68-72. 6317570 https://doi.org/10.1109/PVSC.2012.6317570
Lee, Jongwon ; Dahal, Som N. ; Honsberg, Christiana. / Theoretical analysis for intermediate band and tandem hybrid solar cell materials. Conference Record of the IEEE Photovoltaic Specialists Conference. 2012. pp. 68-72
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