Monocrystalline CdTe solar cells with open-circuit voltage over 1 v and efficiency of 17%

Yuan Zhao, Mathieu Boccard, Shi Liu, Jacob Becker, Xin Hao Zhao, Calli M. Campbell, Ernesto Suarez, Maxwell B. Lassise, Zachary Holman, Yong-Hang Zhang

Research output: Contribution to journalArticle

70 Citations (Scopus)

Abstract

The open-circuit voltages of mature single-junction photovoltaic devices are lower than the bandgap energy of the absorber, typically by a gap of 400 mV. For CdTe, which has a bandgap of 1.5 eV, the gap is larger; for polycrystalline samples, the open-circuit voltage of solar cells with the record efficiency is below 900 mV, whereas for monocrystalline samples it has only recently achieved values barely above 1 V. Here, we report a monocrystalline CdTe/MgCdTe double-heterostructure solar cell with open-circuit voltages of up to 1.096 V. The latticed-matched MgCdTe barrier layers provide excellent passivation to the CdTe absorber, resulting in a carrier lifetime of 3.6 μs. The solar cells are made of 1- to 1.5-μm-thick n-type CdTe absorbers, and passivated hole-selective p-type a-SiC y:H contacts. This design allows CdTe solar cells to be made thinner and more efficient. The best power conversion efficiency achieved in a device with this structure is 17.0%.

Original languageEnglish (US)
Article number16067
JournalNature Energy
Volume1
Issue number6
DOIs
StatePublished - May 9 2016

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Open circuit voltage
Solar cells
Energy gap
Carrier lifetime
Passivation
Conversion efficiency
Heterojunctions

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Fuel Technology
  • Renewable Energy, Sustainability and the Environment
  • Electronic, Optical and Magnetic Materials

Cite this

Monocrystalline CdTe solar cells with open-circuit voltage over 1 v and efficiency of 17%. / Zhao, Yuan; Boccard, Mathieu; Liu, Shi; Becker, Jacob; Zhao, Xin Hao; Campbell, Calli M.; Suarez, Ernesto; Lassise, Maxwell B.; Holman, Zachary; Zhang, Yong-Hang.

In: Nature Energy, Vol. 1, No. 6, 16067, 09.05.2016.

Research output: Contribution to journalArticle

Zhao, Y, Boccard, M, Liu, S, Becker, J, Zhao, XH, Campbell, CM, Suarez, E, Lassise, MB, Holman, Z & Zhang, Y-H 2016, 'Monocrystalline CdTe solar cells with open-circuit voltage over 1 v and efficiency of 17%', Nature Energy, vol. 1, no. 6, 16067. https://doi.org/10.1038/nenergy.2016.67
Zhao, Yuan ; Boccard, Mathieu ; Liu, Shi ; Becker, Jacob ; Zhao, Xin Hao ; Campbell, Calli M. ; Suarez, Ernesto ; Lassise, Maxwell B. ; Holman, Zachary ; Zhang, Yong-Hang. / Monocrystalline CdTe solar cells with open-circuit voltage over 1 v and efficiency of 17%. In: Nature Energy. 2016 ; Vol. 1, No. 6.
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