Journal
ACS NANO
Volume 7, Issue 10, Pages 9443-9451Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn404272j
Keywords
cobalt sulfide; nanocrystals; cost-effective; large area; dye-sensitized solar cell; counter electrode
Categories
Funding
- National Science Council of Taiwan [NSC 102-2221-E-007-023-MY3, NSC 102-2221-E-007-090-MY2, NSC 101-2623-E-007-013-IT]
- Minitry of Economic Affairs, Taiwan [101-EC-17-A-09-S1-198]
- National Tsing Hua University [102N2051E1, 102N2061E1]
- Bureau of Energy [102-D0104]
- Industrial Technology Research Institute
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We report the development of Co9S8 nanocrystals as a cost-effective cathode material that can be readily combined with spraying techniques to fabricate large-area dye-sensitized solar cell (DSSC) devices and can be further connected with series or parallel cell architectures to obtain a relatively high output voltage or current. A gram-scale synthesis of Co9S8 nanoaystal Is carried out via a noninjection reaction by mixing anhydrous CoCl2 with trioctylphosphine (TOP), dodecanethiol and oleylamine (OLA) at 250 degrees C The Co9S8 nanoaystals possess excellent catalytic ability with respect to I-/I-3(-) redox reactions. The Co9S8 nanocrystals are prepared as nanoinks to fabricate uniform, crack-free Co9S8 thin films on different substrates by using a spray deposition technique. These OA films are used as counter electrodes assembled with dye-adsorbed TiO2 photoanodes to fabricate DSSC devices having a working area of 2 cm(2) and an average power conversion efficiency (PCE) of 7.02 +/- 0.18% under AM 1.5 solar illumination, which is comparable with the Pa of 7.2 +/- 0.12% obtained using a Pt cathode. Furthermore, six 2 cm(2)-sized DSSC devices connected in series output an open-circuit voltage of 4.2 V that can power a wide range of electronic devices such as LED arrays and can charge commercial lithium ion batteries.
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