Wide bandgap n-type and p-type semiconductor porous junction devices as photovoltaic cells

Yuan Pai Lin, Yu Chiang Chao, Hsin Fei Meng, Hsiao Wen Zan, Sheng Fu Horng

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

In junction absorber photovoltaics doped wide bandgap n-type and p-type semiconductors form a porous interpenetrating junction structure with a layer of low bandgap absorber at the interface. The doping concentration is high enough such that the junction depletion width is smaller than the pore size. The highly conductive neutral region then has a dentrite shape with fingers reaching the absorber to effectively collect the photo-carriers swept out by the junction electric field. With doping of 1019 cm-3 corresponding to a depletion width of 25 nm, pore size of 32 nm, absorber thickness close to exciton diffusion length of 17 nm, absorber bandgap of 1.4 eV and carrier mobility over 10-5 cm2 V-1 s-1, numerical calculation shows the power conversion efficiency is as high as 19.4%. It rises to 23% for a triplet exciton absorber.

Original languageEnglish
Article number405103
JournalJournal of Physics D: Applied Physics
Volume44
Issue number40
DOIs
Publication statusPublished - 2011 Sep 29

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Acoustics and Ultrasonics
  • Surfaces, Coatings and Films

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