Biohybrid Photoprotein‐Semiconductor Cells with Deep‐Lying Redox Shuttles Achieve a 0.7 V Photovoltage

Varun Kumar Singh, Sai Kishore Ravi, Jian Wei Ho, Johnson Kai Chi Wong, Michael R. Jones, Swee Ching Tan*

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

39 Citations (Scopus)
426 Downloads (Pure)


Photosynthetic proteins transduce sunlight into biologically useful forms of energy through a photochemical charge separation that has a close to 100% quantum efficiency, and there is increasing interest in their use as sustainable materials in biohybrid devices for solar energy harvesting. This work explores a new strategy for boosting the open circuit voltage of photoelectrochemical cells based on a bacterial photosynthetic pigment-protein by employing highly oxidizing redox electrolytes in conjunction with an n-type silicon anode. Illumination generates electron–hole pairs in both the protein and the silicon electrode, the two being connected by the electrolyte which transfers electrons from the reducing terminal of the protein to photogenerated holes in the silicon valence band. A high open circuit voltage of 0.6 V is achieved with the most oxidizing electrolyte 2,2,6,6-tetramethyl-1-piperidinyloxy, and this is further improved to 0.7 V on surface modification of the silicon electrode to increase its surface area and reduce reflection of incident light. The photovoltages produced by these biohybrid protein/silicon cells are comparable to those typical of silicon heterojunction and dye-sensitized solar cells.

Original languageEnglish
Article number1703689
Number of pages8
JournalAdvanced Functional Materials
Issue number24
Early online date27 Sept 2017
Publication statusPublished - 13 Jun 2018


  • open circuit voltage enhancements
  • photo-bioelectrochemical cells
  • photosynthetic proteins
  • redox electrolytes
  • solar energy harvesting


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