1. |
- Xiong, Dehua, et al.
(författare)
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Enhanced Performance of p-Type Dye-Sensitized Solar Cells Based on Ultrasmall Mg-Doped CuCrO2 Nanocrystals
- 2013
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Ingår i: ChemSusChem. - : Wiley. - 1864-5631 .- 1864-564X. ; 6:8, s. 1432-1437
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Tidskriftsartikel (refereegranskat)abstract
- Herein, we present ultrasmall delafossite-type Mg-doped CuCrO2 nanocrystals prepared by using hydrothermal synthesis and their first application as photocathodes in efficient p-type dye-sensitized solar cells. The short-circuit current density (J(sc)) is notably increased by approximately 27% owing to the decreased crystallite size and the enhanced optical transmittance associated with Mg doping of the CuCrO2 nanocrystalline sample. An open-circuit voltage (V-oc) of 201mV, J(sc) of 1.51mAcm(-2), fill factor of 0.449, and overall photoconversion efficiency of 0.132% have been achieved with the CuCr0.9Mg0.1O2 dye photocathode sensitized with the P1 dye under optimized conditions. This efficiency is nearly threetimes higher than that of the NiO-based reference device, which is attributed to the largely improved V-oc and J(sc). The augmentation of V-oc and J(sc) can be attributed to the lower valance band position and the faster hole diffusion coefficient of CuCr0.9Mg0.1O2 compared to those of the NiO reference, respectively, which leads to a higher hole collection efficiency.
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2. |
- Xu, Xiaobao, et al.
(författare)
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Efficient p-type dye-sensitized solar cells based on disulfide/thiolate electrolytes
- 2013
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Ingår i: Nanoscale. - : Royal Society of Chemistry (RSC). - 2040-3364 .- 2040-3372. ; 5:17, s. 7963-7969
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Tidskriftsartikel (refereegranskat)abstract
- Herein, an organic redox couple 1-methy-1H-tetrazole-5-thiolate (T-) and its disulfide dimer (T-2) redox shuttle, as an electrolyte, is introduced in a p-type dye-sensitized solar cell (DSC) on the basis of an organic dye (P1) sensitizer and nanocrystal CuCrO2 electrode. Using this iodide-free transparent redox electrolyte in conjunction with the sensitized heterojunction, we achieve a high open-circuit voltage of over 300 mV. An optimal efficiency of 0.23% is obtained using a CoS counter electrode and an optimized electrolyte composition under AM 1.5 G 100 mW cm(-2) light illumination which, to the best of our knowledge, represents the highest efficiency that has so far been reported for p-type DSCs using organic redox couples.
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