High-efficiency heterojunction solar cells on crystalline germanium substrates

Bahman Hekmatshoar, Davood Shahrjerdi, Marinus Hopstaken, Keith Fogel, Devendra K. Sadana

Research output: Contribution to journalArticlepeer-review


We report stand-alone heterojunction (HJ) solar cells with conversion efficiencies of 5.9 and 7.2 on n-type and p-type crystalline germanium (c-Ge) substrates, respectively. The emitter of the HJ solar cells is formed by growing thin layers of highly doped hydrogenated microcrystalline silicon using plasma-enhanced chemical vapor deposition at temperatures close to 200 °C. The conversion efficiencies of the HJ solar cells are well-comparable with conventional devices fabricated at temperatures as high as 600 °C. We also study the surface passivation of c-Ge with hydrogenated amorphous and microcrystalline Si and correlate the passivation quality with the electrical performance of the HJ solar cells.

Original languageEnglish (US)
Article number032102
JournalApplied Physics Letters
Issue number3
StatePublished - Jul 16 2012

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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