Tandem photovoltaic-photoelectrochemical GaAs/InGaAsP-WO3/BiVO4 device for solar hydrogen generation

Sonya Kosar, Yuriy Pihosh, Ivan Turkevych, Kazuma Mawatari, Jin Uemura, Yutaka Kazoe, Kikuo Makita, Takeyoshi Sugaya, Takuya Matsui, Daisuke Fujita, Masahiro Tosa, Yaroslav M. Struk, Michio Kondo, Takehiko Kitamori

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)


We demonstrated highly efficient solar hydrogen generation via water splitting by photovoltaic-photoelectrochemical (PV-PEC) tandem device based on GaAs/InGaAsP (PV cell) and WO3/BiVO4 core/shell nanorods (PEC cell). We utilized extremely thin absorber (ETA) concept to design the WO3/BiVO4 core/shell heterojunction nanorods and obtained the highest efficiencies of generation, separation and transfer of the photoinduced charge carriers that are possible for the WO3/BiVO4 material combination. The PV-PEC tandem shows stable water splitting photocurrent of 6.56mA&cm%2 under standard AM1.5G solar light that corresponds to the record solar-to-hydrogen (STH) conversion efficiency of 8.1%.

Original languageEnglish
Article number04ES01
JournalJapanese journal of applied physics
Issue number4
Publication statusPublished - 2016 Apr
Externally publishedYes

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)


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