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JPCL 10.1021/jz3003603 Wu Presentation

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JPCL 10.1021/jz3003603 Wu Presentation

  1. 1. p-Type Dye-Sensitized Solar Cells Based on Delafossite CuGaO2 Nanoplates with Saturation Photovoltages Exceeding 460 mVMingzhe Yu, Gayatri Natu, Zhiqiang Ji,and Yiying Wu**Department of Chemistry & Biochemistry, The OhioState University, 100 West 18th Avenue, Columbus,Ohio 43210, United StatesJ. Phys. Chem. Lett. 2012, Vol. 3, 1074 -1078 1
  2. 2. MotivationsExploring new p-type semiconductor nanoparticles alternative to thecommonly used NiO is crucial for p-type dye-sensitized solar cells (p-DSSCs) to achieve higher open-circuit voltages (Voc). Delafossite CuGaO2 has a lower valence band maximum(VBM)compared to NiO and therefore could provide a larger Voc in p-DSSCs. In contrast to the dark colored NiO, the CuGaO2 nanoplates are whitebecause of the large band-gap. Therefore, the porous films made of thesenanoplates barely compete with the dye sensitizers for visible lightabsorption. Proprietary and Confidential 2 American Chemical Society
  3. 3. Material Synthesis and CharacterizationHydrothermal synthesis with ethylene glycol(EG) and cetrimoniumbromide(CTAB) was employed to get CuGaO2 nanoplates :Cu(NO3)2 KOH Colloid HydrothermalCa(NO3)3 Products pH~5CTAB EG 193oC, 52hrsCuGaO2 NiO Proprietary and Confidential 3 American Chemical Society
  4. 4. CuGaO2 nanoplate’s thermal-stabilityIt’s important to make sure that CuGaO2 won’t decompose during the thermal-treatment in the solar cell fabrication process because of the existence of Cu+.The X-ray diffraction(XRD) pattern showed that CuGaO2 is thermo-kineticallystable when heated below 350oC. Proprietary and Confidential 4 American Chemical Society
  5. 5. Saturation-Voc measurements for solar cellsCuGaO2-based p-DSSCs exhibited significant higher saturation-Voc, whichindicates the maximum obtainable Voc, than NiO-based cells under intenseillumination:(Solar cell configuration: photocathode: CuGaO2 film on FTO; dye: P1;electrolyte: I3-/I-/MPN or Co3+/2+(dtb-bpy) /MeCN; counter-electrode: Pt-FTO ) Proprietary and Confidential 5 American Chemical Society
  6. 6. CuGaO2-DSSCs J-V performanceA Voc as 357mV in Co3+/2+(dtb-bpy) electrolyte was achieved and it’s among thehighest values that have been reported. More research is undergoing to increase the current intensity. Proprietary and Confidential 6 American Chemical Society
  7. 7. Conclusion We report the first application of light- colored CuGaO2 nanoplates in p-DSSCs that produce high photovoltages. A Voc of 357 mV has been achieved with a Acknowledgments Co3+/2+(dtb-bpy) electrolyte under 1 Sun The authors acknowledge the AM 1.5 illumination. And more funding support from the U.S. remarkably, a saturation photovoltage of Department of Energy (Award 464 mV has been achieved with the No. DE-FG0207ER46427). increasing illumination intensity.Proprietary and Confidential 7American Chemical Society