High-efficiency heterojunction solar cells on crystalline germanium substrates

Bahman Hekmatshoar, Davood Shahrjerdi, Marinus Hopstaken

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

Abstract

Stand-alone heterojunction (HJ) solar cells demonstrated on crystalline germanium (c-Ge) substrates are proposed for usage as the bottom cells of tandem-junction solar cells in various thin-film solar cell technologies. The emitter of the HJ solar cells is formed by growing thin layers of highly doped hydrogenated microcrystalline silicon (μc-Si:H) and further passivated by growing thin layers of hydrogenated amorphous silicon (a-Si:H). The μc-Si:H and a-Si:H layers are grown in the same reactor using plasma-enhanced chemical vapor deposition (PECVD) at temperatures close to 200°C. The quality of the c-Ge surface passivation by μc-Si:H and a-Si:H has a direct impact on the electrical performance of the HJ solar cells. Conversion efficiencies of 5.9% and 7.2% have been achieved for stand-alone c-Ge solar cells on n-type and p-type c-Ge substrates, respectively. These conversion efficiencies are well-comparable with the conversion efficiencies reported for conventional homojunction solar cells fabricated at temperatures as high as 600°C.

Original languageEnglish (US)
Title of host publicationOxide-Based Materials and Devices V
PublisherSPIE
Volume8987
ISBN (Print)9780819499004
DOIs
StatePublished - 2014
Event5th Annual Oxide Based Materials and Devices Conference - San Francisco, CA, United States
Duration: Feb 2 2014Feb 5 2014

Other

Other5th Annual Oxide Based Materials and Devices Conference
CountryUnited States
CitySan Francisco, CA
Period2/2/142/5/14

Fingerprint

Germanium
Heterojunction
Solar Cells
High Efficiency
Heterojunctions
heterojunctions
germanium
Solar cells
solar cells
Substrate
Crystalline materials
Substrates
Conversion efficiency
Thin Layer
Thin Film Solar Cells
Microcrystalline silicon
Amorphous Silicon
Passivation
Chemical Vapor Deposition
homojunctions

Keywords

  • Germanium
  • Heterojunctions
  • Plasma chemical vapor deposition
  • Solar cells
  • Surface passivation

ASJC Scopus subject areas

  • Applied Mathematics
  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Hekmatshoar, B., Shahrjerdi, D., & Hopstaken, M. (2014). High-efficiency heterojunction solar cells on crystalline germanium substrates. In Oxide-Based Materials and Devices V (Vol. 8987). [898722] SPIE. https://doi.org/10.1117/12.2045632

High-efficiency heterojunction solar cells on crystalline germanium substrates. / Hekmatshoar, Bahman; Shahrjerdi, Davood; Hopstaken, Marinus.

Oxide-Based Materials and Devices V. Vol. 8987 SPIE, 2014. 898722.

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

Hekmatshoar, B, Shahrjerdi, D & Hopstaken, M 2014, High-efficiency heterojunction solar cells on crystalline germanium substrates. in Oxide-Based Materials and Devices V. vol. 8987, 898722, SPIE, 5th Annual Oxide Based Materials and Devices Conference, San Francisco, CA, United States, 2/2/14. https://doi.org/10.1117/12.2045632
Hekmatshoar B, Shahrjerdi D, Hopstaken M. High-efficiency heterojunction solar cells on crystalline germanium substrates. In Oxide-Based Materials and Devices V. Vol. 8987. SPIE. 2014. 898722 https://doi.org/10.1117/12.2045632
Hekmatshoar, Bahman ; Shahrjerdi, Davood ; Hopstaken, Marinus. / High-efficiency heterojunction solar cells on crystalline germanium substrates. Oxide-Based Materials and Devices V. Vol. 8987 SPIE, 2014.
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