Journal
ACS NANO
Volume 8, Issue 10, Pages 10597-10605Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn5040982
Keywords
iron pyrite; dye-sensitized solar cells; counter electrode; spray pyrolysis
Categories
Funding
- Singapore National Research Foundation [NRF-RF2009-06, M58110061]
- Nanyang Technological University [M58110100]
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Iron pyrite has been the material of interest in the solar community due to its optical properties and abundance. However, the progress is marred due to the lack of control on the surface and intrinsic chemistry of pyrite. In this report, we show iron pyrite as an efficient counter electrode (CE) material alternative to the conventional Pt and poly(3,4-ethylenedioxythiophene (PEDOT) CEs in dye-sensitized solar cells (DSSCs). Pyrite film CEs prepared by spray pyrolysis are utilized in I-3(-))/I- and Co(III)/Co(II) electrolyte-mediated DSSCs. From cyclic voltammetry and impedance spectroscopy studies, the catalytic activity is found to be comparable with that of Pt and PEDOT in I-3(-)/I- and Co(III)/Co(II) electrolyte, respectively. With the I-3(-)/I- electrolyte, photoconversion efficiency is found to be 8.0% for the pyrite CE and 7.5% for Pt, whereas with Co(III)/Co(II) redox DSSCs, efficiency is found to be the same for both pyrite and PEDOT (6.3%). The excellent performance of the pyrite CE in both the systems makes it a distinctive choice among the various CE materials studied.
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