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Two Redox Couples are Better Than One: Improved Current and Fill Factor from Cobalt‐Based Electrolytes in Dye‐Sensitized Solar Cells
Author(s) -
Cong Jiayan,
Hao Yan,
Sun Licheng,
Kloo Lars
Publication year - 2014
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201301273
Subject(s) - cobalt , dye sensitized solar cell , redox , electrolyte , materials science , energy conversion efficiency , electrode , auxiliary electrode , inorganic chemistry , chemical engineering , nanotechnology , chemistry , optoelectronics , metallurgy , engineering
A tandem redox strategy is used in cobalt‐based electrolytes . Co(bpy) 3 2+ /Co(bpy) 3 3+ offers a high photovoltage at the photoanode, whereas the I − /I 3 − or Fc/Fc + redox couples facilitate charge transfer at the counter electrode. Electron exchange in the electrolyte offers beneficial concentration gradients. The overall conversion efficiency is improved from 6.5% to 7.5%.